VRF-Autoclassify
The Virtual Routing and Forwarding (VRF)-Autoclassify feature enables certain types of Policy Based
Routing (PBR) to be created dynamically without configuring all the related route maps and access lists.
The feature facilitates the mapping of packets to VRFs other than the one assigned to the ingress
interface.
History for the VRF-Autoclassify Feature
Release
Modification
12.2(27)SBA
This feature was introduced.
Finding Support Information for Platforms and Cisco IOS Software Images
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Contents
•
Information About VRF-Autoclassify, page 1
•
How to Configure VRF-Autoclassify, page 3
•
Configuration Examples for VRF-Autoclassify, page 10
•
Additional References, page 12
•
Command Reference, page 13
Information About VRF-Autoclassify
To configure the VRF–Autoclassify feature, you should understand the following concepts:
•
Feature Design of VRF-Autoclassify, page 2
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VRF-Autoclassify
Information About VRF-Autoclassify
Feature Design of VRF-Autoclassify
When a router receives a packet, the packet is mapped to a global table by default. When the ip vrf
forwarding command is used to assign a specific VRF on the ingress interface, the packet is mapped to
that VRF. The packet is forwarded based on the routes in the VRF.
The VRF-Autoclassify feature enables the capability to map packets from connected hosts to VRFs that
are different from the VRF defined on the ingress interface. This feature also enables the configuration
of policies that are required for the mapping of packets to the VRFs depending on whether the source
address of the packet belongs to those connected routes.
For example, in Figure 1 Fast Ethernet interface 0/0 is configured with two secondary addresses,
1.1.1.1/24 and 2.1.1.1/24. The first address, 1.1.1.1/24, is assigned to VRF red, while the other,
2.1.1.1/24, is assigned to VRF green. So in the VRF red table, a connected route 1.1.1.0/24 is installed,
while in VRF green, 2.1.1.0/24 is installed. The routing information can be learned dynamically or
statically defined.
There is a default route in VRF red that directs all traffic to Fast Ethernet interface 1/0, while in VRF
green, another default route directs all traffic to Fast Ethernet interface 1/1. When packets arrive at Fast
Ethernet interface 0/0, they are mapped to either VRF red or VRF green based on their source address.
If the source address is 1.1.1.2, connected route 1.1.1.0/24 is used, and the packet is mapped to VRF red.
Following the default route, it is forwarded out of Fast Ethernet interface 1/0.
Figure 1
Routing and Mapping of Packets with VRF-Autoclassify Enabled
VRF red
1.1.1.2
Fast ethernet0/0
1.1.1.1/24 vrf red
2.1.1.1/24 vrf green
VRF red
Fast ethernet1/0
ip vrf forwarding red
3.1.1.1/24
Fast ethernet1/1
ip vrf forwarding green
4.1.1.1/24
127902
VRF green
VRF green
2.1.1.2
For the return traffic, packets are mapped to the VRF configured on the downstream interface. For
example, when a packet is received by a Fast Ethernet interface, destined for host 1.1.1.2, it is marked
VRF red automatically based on the VRF configured on the downstream interface using the ip vrf
forwarding red command. A lookup in VRF red would return a connected route for 1.1.1.0/24 out of
Fast Ethernet interface 0/0 or return a 1.1.1.2/32 that is a directly connected neighbor. When the
connected route 1.1.1.0/24 is installed in vrf red while pointing out of an interface that is native to the
global table or some other table, the table is tracked. See Figure 2.
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How to Configure VRF-Autoclassify
Figure 2
Return-Packet Mapping on the Downstream Interface
Fast ethernet1/0
ip vrf forwarding red
3.1.1.1/24
Fast ethernet0/0
VRF red
1.1.1.1/24 vrf red
2.1.1.1/24 vrf green
Fast ethernet1/1
ip vrf forwarding green
4.1.1.1/24
127901
VRF green
This feature is targeted for directly connected hosts on broadcast media such as an Ethernet interface. In
networks in which VRF autoclassify is enabled, the IP addresses of the connected hosts can be assigned
by using DHCP.
How to Configure VRF-Autoclassify
This section contains the following tasks:
•
Enabling VRF-Autoclassify, page 3 (required)
•
Configuring Secondary Addresses for Different VRFs, page 5 (required)
•
Configuring VRF Forwarding, page 6 (optional)
•
Verifying VRF-Autoclassify Configuration, page 7 (optional)
Enabling VRF-Autoclassify
Perform this task to enable VRF autoclassify. When a upstream interface is configured, ARP is required
to apply a policy on the ARP packets received and map them to different VRFs based on the source
addresses of the packets. ARP is also required to insert new entries into its table with the VRF
identification for the VRF-Autoclassify feature. When the ARP lookup is performed as a packet is
switched out of the upstream interface in the process switching path, the packet with the VRF table
identification should be used, instead of the VRF configured on the upstream interface.
Restrictions
Any directly connected hosts must not run routing protocols and the router that is enabled with the
VRF-Autoclassify feature must not run routing protocols.
If the ip policy route-map command and the ip vrf select source command are specified on an interface,
the interface will reject the ip vrf auto source command. VRF-Autoclassify is blocked because PBR is
set with VRF/VRF select.
Overlapped subnets are are not allowed in the same VRF on a broadcast media interface if it is already
defined on another interface.
This feature is applicable only to unicast packets. Multicast packets, including control packets (for
example, PIM protocol packets) are not affected by this feature.
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How to Configure VRF-Autoclassify
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
interface type number
4.
ip vrf autoclassify source
5.
Repeat Steps 3 and 4 for the required number of secondary VRFs specified using the ip address
command.
6.
exit
DETAILED STEPS
Step 1
Command or Action
Purpose
enable
Enables privileged EXEC mode.
•
Enter your password if prompted.
Example:
Router> enable
Step 2
configure terminal
Enters global configuration mode.
Example:
Router# configure terminal
Step 3
interface type number
Enters interface configuration mode.
Note
Example:
Router(config)# interface fastethernet0/1
Step 4
Refer to the Cisco IOS Interface and Hardware
Component Command Reference, Release 12.3T for
specific interface and hardware types.
ip vrf autoclassify source
Enables VRF autoclassify on the source interface specified
in Steps 3 and 4.
Example:
Note
Router(config-if)# ip vrf autoclassify source
When the ip vrf autoclassify source command is
configured, Policy-Based Routing (PBR) and the
dynamic route maps are automatically configured
on an interface.
Step 5
Repeat Steps 3 and 4 for the required number of
secondary VRFs specified using the ip address
command.
—
Step 6
exit
Exits to global configuration mode.
Example:
Router# exit
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How to Configure VRF-Autoclassify
Configuring Secondary Addresses for Different VRFs
Perform this task to enable the secondary addresses for different VRFs. When the VRF tables are
removed globally, the secondary addresses and the policies are removed also.
When a VRF secondary address is defined on an interface, and the connected route is installed in the
routing table and CEF table of that VRF, the broadcast entries and the interface address entry
(corresponding receive entries) for that VRF secondary address should also be installed in the CEF table
of that VRF, rather than the VRF defined for the interface.
If a packet is mapped by VRF autoclassify to a VRF different from that configured on the ingress
interface, unicast RPF filters the packet based on the routes in the routing table of the VRF of the packet,
rather than the VRF of the interface.
Dynamic route maps are generated automatically based on the configured VRF secondary
addresses. There is no configuration required using the route-map command.
Note
Restrictions
Overlapped subnets are not allowed in the same VRF on a broadcast media interface if it is already
defined on another interface.
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
interface type number
4.
ip address ip-address mask [secondary [vrf vrf-name]]
5.
Repeat Steps 3 and 4 for the required number of secondary interfaces that are configured for VRF
autoclassify.
6.
match ip source ip-address mask
7.
exit
DETAILED STEPS
Step 1
Command or Action
Purpose
enable
Enables privileged EXEC mode.
•
Enter your password if prompted.
Example:
Router> enable
Step 2
configure terminal
Enters global configuration mode.
Example:
Router# configure terminal
Step 3
interface type number
Enters interface configuration mode.
Note
Example:
Router(config)# interface fastethernet0/1
Refer to the Cisco IOS Interface and Hardware
Component Command Reference, Release 12.3T for
specific interface and hardware types.
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How to Configure VRF-Autoclassify
Step 4
Command or Action
Purpose
ip address ip-address mask [secondary [vrf
vrf-name]]
Configures a secondary IP address for all ingress interfaces.
The vrf keyword is used when the VRF-Autoclassify
feature is enabled.
Example:
Router(config-if)# ip address 10.0.0.0
255.0.0.0 secondary vrf red
Step 5
Repeat Steps 3 and 4 for the required number of
secondary interfaces that are configured for VRF
autoclassify.
—
Step 6
match ip source ip-address mask
Defines the source address to match. The ip-address and
mask arguments are the IP address and subnet for the
specified VRF.
Example:
Router(conf-route-map)# match ip source 1.1.1.1
255.255.255.0
Step 7
Exits to global configuration mode.
exit
Example:
Router# exit
Configuring VRF Forwarding
Perform this task to configure VRF forwarding on an interface. This configuration task is optional unless
a different default VRF table is required other than the global table.
Prerequisites
Because the connected routes are added only to the specified VRF, packets destined for hosts on those
subnets need to be mapped to that VRF in order to be forwarded properly.
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
interface type number
4.
ip vrf forwarding vrf-name
5.
exit
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How to Configure VRF-Autoclassify
DETAILED STEPS
Step 1
Command or Action
Purpose
enable
Enables privileged EXEC mode.
•
Enter your password if prompted.
Example:
Router> enable
Step 2
configure terminal
Enters global configuration mode.
Example:
Router# configure terminal
Step 3
interface type number
Enters interface configuration mode.
Note
Example:
Router(config)# interface fastethernet0/1
Step 4
ip vrf forwarding vrf-name
Example:
Refer to the Cisco IOS Interface and Hardware
Component Command Reference, Release 12.3T for
specific interface and hardware types.
Associates a VPN VRF instance with an interface or
subinterface to which packets are forwarded. The vrf-name
argument is the name assigned to the VRF.
Router(config-if)# ip vrf forwarding red
Step 5
Exits to global configuration mode.
exit
Example:
Router# exit
Verifying VRF-Autoclassify Configuration
To verify the VRF-Autoclassify configuration, perform the following steps.
SUMMARY STEPS
1.
show ip interface secondary interface type number
2.
show ip interface autoclassify interface type number
3.
show route-map dynamic
4.
show ip policy
5.
show ip interface type number
6.
show cef interface type number internal
7.
show ip arp
8.
show ip arp vrf vrf-name
DETAILED STEPS
Step 1
show ip interface secondary interface type number
Use this command to verify that the secondary interface is configured for a secondary IP address and
VRF, for example:
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Router# show ip interface secondary ethernet3/1
IP Address/Mask
1.1.1.1/24
Step 2
VRF
red
show ip interface autoclassify interface type number
Use this command to verify that the interface is enabled with VRF-Autoclassify, for example:
Router# show ip interface autoclassify ethernet3/1
IP Address/Mask
1.1.1.0/24
Step 3
VRF
red
show route-map dynamic
Use this command to verify the route map, for example:
Router# show route-map dynamic
route-map None-06/01/04-21:14:21.407-1-IP VRF, permit, sequence 0, identifier 1675771000
Match clauses:
Set clauses:
vrf red
Policy routing matches: 0 packets, 0 bytes
Current active dynamic routemaps = 1
Step 4
show ip policy
Use this command to verify the route-map policy configuration, for example:
Router# show ip policy
Interface
Route map
Early Policy:
Interface
Ethernet3/1
Step 5
Route map
None-06/01/04-21:14:21.407-1-IP VRF (Dynamic)
show ip interface type number
Use this command to verify that there is a secondary IP address configured and that VRF-Autoclassify
is enabled, for example:
Router# show ip interface ethernet3/1
Ethernet3/1 is up, line protocol is up
Internet address is 20.1.1.1/24
Broadcast address is 255.255.255.255
Address determined by setup command
MTU is 1500 bytes
Helper address is not set
Directed broadcast forwarding is disabled
Secondary address 1.1.1.1/24
Outgoing access list is not set
Inbound access list is not set
Proxy ARP is enabled
Local Proxy ARP is disabled
Security level is default
Split horizon is enabled
ICMP redirects are always sent
ICMP unreachables are always sent
ICMP mask replies are never sent
IP fast switching is enabled
IP Flow switching is disabled
IP CEF switching is enabled
IP CEF switching turbo vector
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IP CEF turbo switching turbo vector
IP multicast fast switching is enabled
IP multicast distributed fast switching is disabled
IP route-cache flags are Fast, CEF
Router Discovery is disabled
IP output packet accounting is disabled
IP access violation accounting is disabled
TCP/IP header compression is disabled
RTP/IP header compression is disabled
Probe proxy name replies are disabled
Policy routing is disabled
Network address translation is disabled
WCCP Redirect outbound is disabled
WCCP Redirect inbound is disabled
WCCP Redirect exclude is disabled
BGP Policy Mapping is disabled
Input features: IP VRF Autoclassify
Step 6
show cef interface type number internal
Use this command to verify that Cisco Express Forwarding (CEF) and VRF-Autoclassify is enabled, for
example:
Router# show cef interface ethernet3/1 internal
Ethernet3/1 is up (f-number 6)
Corresponding hwidb fast_if_number 6
Corresponding hwidb firstsw->if_number 6
Internet address is 20.1.1.1/24
Secondary address 1.1.1.1/24
ICMP redirects are always sent
Per packet load-sharing is disabled
IP unicast RPF check is disabled
Input features: IP VRF Autoclassify
Inbound access list is not set
Outbound access list is not set
IP policy routing is disabled
BGP based policy accounting on input is disabled
BGP based policy accounting on output is disabled
Hardware dab is Ethernet3/1
Fast switching type 1, interface type 64
IP CEF switching enabled
IP CEF switching turbo vector
IP CEF turbo switching turbo vector
IP prefix lookup IPv4 mitre 8-8-8-8 optimized
Input fast flags 0x0, Output fast flags 0x0
ifindex 4(4)
Slot 3 Slot unit 1 VC -1
Transmit limit accumulator 0x0 (0x0)
IP MTU 1500
Subblocks:
Early Policy: IP early policy route map is None-06/01/04-21:14:21.407-1-IP VRF
Attached prefix export tracking subblock
tracking 1 table hosting exported attached prefixes
vrf: “red”
IPv4: Internet address is 20.1.1.1/24
Secondary address 1.1.1.1/24
Broadcast address 255.255.255.255
Per packet load-sharing is disabled
IP MTU 1500
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Configuration Examples for VRF-Autoclassify
Step 7
show ip arp
Use this command to verify that ARP is enabled, for example:
Router# show ip arp
Protocol Address
Internet 20.1.1.1
Internet 10.0.18.171
Step 8
Age (min) Hardware Addr
Type
0050.a2de.7055 ARPA
0050.a2de.7054 ARPA
Interface
Ethernet3/1
Ethernet3/0
show ip arp vrf vrf-name
Use this command to verify that the VRF named “red” is assigned to the correct IP address and
interfaces, for example:
Router# show ip arp vrf red
Protocol Address
Internet 1.1.1.1
Internet 2.1.1.1
Age (min) Hardware Addr
Type
0050.a2de.7055 ARPA
0050.a2de.7056 ARPA
Interface
Ethernet3/1
Ethernet3/2
Use the ping command from IP address 1.1.1.2 to IP address 1.1.1.1 and then the show ip arp vrf red
command to verify the ARP entry of 1.1.1.2 in VRF red, for example:
Router# show ip arp vrf red
Protocol
Internet
Internet
Internet
Address
1.1.1.1
1.1.1.2
2.1.1.1
Age (min) Hardware Addr
0050.a2de.7055
19
000a.f4b1.2b82
0050.a2de.7056
Type
ARPA
ARPA
ARPA
Interface
Ethernet3/1
Ethernet3/1
Ethernet3/2
A ping from IP address 2.1.1.1 and IP address 2.1.1.2 are also good. This creates an ARP entry of 2.1.1.2
in VRF red as shown below using the show ip arp vrf red command.
Router# show ip arp vrf red
Protocol
Internet
Internet
Internet
Internet
Address
2.1.1.2
1.1.1.1
1.1.1.2
2.1.1.1
Age (min) Hardware Addr
8
0050.50c1.f011
0050.a2de.7055
19
000a.f4b1.2b82
0050.a2de.7056
Type
ARPA
ARPA
ARPA
ARPA
Interface
Ethernet3/2
Ethernet3/1
Ethernet3/1
Ethernet3/2
Configuration Examples for VRF-Autoclassify
The section provides the following configuration examples:
•
VRF-Autoclassify Basic Connectivity Configuration: Example, page 10
•
Multiple VRFs on the Same Interface Configuration: Example, page 11
VRF-Autoclassify Basic Connectivity Configuration: Example
The following example shows how to configure basic connectivity that uses the VRF-Autoclassify
feature.
interface Ethernet0/1
ip address 1.1.1.2 255.255.255.0
interface Ethernet3/1
ip address 1.1.1.1 255.255.255.0 secondary vrf red
ip address 20.1.1.1 255.255.255.0
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Configuration Examples for VRF-Autoclassify
ip vrf autoclassify source
interface Ethernet3/2
ip vrf forwarding red
ip address 2.1.1.1 255.255.255.0
ip directed-broadcast
The following example shows how to configure Fast Ethernet interface 0/0 for VRF red, and Fast
Ethernet interface 0/1 for VRF green.
interface fastethernet0/0
ip address 1.1.1.1 255.255.255.0 secondary vrf red
interface fastethernet0/1
ip address 1.1.1.1 255.255.255.0 secondary vrf green
The following example shows a configuration of Fast Ethernet interface 0/0 that will not perform,
because the interface is configured for VRF red and green.
interface Fast-Ethernet0/0
ip address 1.1.1.1 255.255.255.0 secondary vrf red
ip address 1.1.1.2 255.255.255.0 secondary vrf green
The following example is another example of a configuration that will not perform, because both
interfaces have IP addresses assigned to VRF red:
interface Fast-Ethernet0/0
ip address 1.1.1.1 255.255.255.0 secondary vrf red
interface Fast-Ethernet0/1
ip address 1.1.1.2 255.255.255.0 secondary vrf red
Multiple VRFs on the Same Interface Configuration: Example
The following example shows how to configure three IP addresses (1.1.1.1/24, 1.1.2.1/24, and
1.1.1.3/16) for Ethernet interface 3/1 in VRF red in one subnet, 1.1.0.0/16.
interface Ethernet3/1
ip address 1.1.1.1 255.255.255.0 secondary vrf red
ip address 1.1.2.1 255.255.255.0 secondary vrf red
ip address 1.1.1.3 255.255.0.0 secondary vrf red
ip address 1.1.0.0 255.255.0.0
ip vrf autoclassify source
duplex half
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Additional References
Additional References
The following sections provide references related to VRF-Autoclassify.
Related Documents
Related Topic
Document Title
ISA and VRF configuration tasks
“Configuring ISA VRF Transfer” chapter of the Cisco IOS ISA
Configuration Guide, Cisco IOS Release 12.3
DHCP configuration tasks
“Configuring DHCP” chapter of the Cisco IOS IP Configuration
Guide, Release 12.3
IP addressing and services configuration tasks
Cisco IOS IP Configuration Guide, Release 12.3
IP addressing and services commands: complete
command syntax, command mode, command history,
defaults, usage guidelines, and examples
Cisco IOS IP Command Reference, Volume 1 of 4: Addressing and
Services, Release 12.3T
Standards
Standards
Title
No new or modified standards are supported by this
—
feature, and support for existing standards has not been
modified by this feature.
MIBs
MIBs
•
MIBs Link
No new or modified MIBs are supported by this
To locate and download MIBs for selected platforms, Cisco IOS
feature, and support for existing MIBs has not been releases, and feature sets, use Cisco MIB Locator found at the
modified by this feature.
following URL:
http://www.cisco.com/go/mibs
RFCs
RFCs
Title
No new or modified RFCs are supported by this
feature, and support for existing RFCs has not been
modified by this feature.
—
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Command Reference
Technical Assistance
Description
Link
Technical Assistance Center (TAC) home page,
containing 30,000 pages of searchable technical
content, including links to products, technologies,
solutions, technical tips, and tools. Registered
Cisco.com users can log in from this page to access
even more content.
http://www.cisco.com/public/support/tac/home.shtml
Command Reference
This section documents new and modified commands only.
New Commands
•
ip vrf autoclassify
•
match ip source
Modified Commands
•
ip address
•
show ip arp
•
show ip interface
•
show route-map
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ip address
ip address
To set a primary or secondary IP address for an interface, use the ip address command in interface
configuration mode. To remove an IP address or disable IP processing, use the no form of this command.
ip address ip-address mask [secondary [vrf vrf-name]]
no ip address ip-address mask [secondary [vrf vrf-name]]
Syntax Description
ip-address
IP address.
mask
Mask for the associated IP subnet.
secondary
(Optional) Configured address is a secondary IP address. If this keyword is
omitted, the configured address is the primary IP address.
Note
vrf
If the secondary address is used for a VRF table configuration with the
vrf keyword, the vrf keyword must be specified also.
(Optional) Name of the VRF table. The vrf-name argument specifies the VRF
name of the ingress interface.
Defaults
No IP address is defined for the interface.
Command Modes
Interface configuration
Command History
Release
Modification
10.0
This command was introduced.
12.2(27)SBA
The vrf keyword and vrf-name argument were introduced.
Usage Guidelines
An interface can have one primary IP address and multiple secondary IP addresses. Packets generated
by the Cisco IOS software always use the primary IP address. Therefore, all routers and access servers
on a segment should share the same primary network number.
Hosts can determine subnet masks using the Internet Control Message Protocol (ICMP) mask request
message. Routers respond to this request with an ICMP mask reply message.
You can disable IP processing on a particular interface by removing its IP address with the no ip address
command. If the software detects another host using one of its IP addresses, it will print an error message
on the console.
The optional secondary keyword allows you to specify an unlimited number of secondary addresses.
Secondary addresses are treated like primary addresses, except the system never generates datagrams
other than routing updates with secondary source addresses. IP broadcasts and Address Resolution
Protocol (ARP) requests are handled properly, as are interface routes in the IP routing table.
Secondary IP addresses can be used in a variety of situations. The following are the most common
applications:
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ip address
•
There may not be enough host addresses for a particular network segment. For example, your
subnetting allows up to 254 hosts per logical subnet, but on one physical subnet you need 300 host
addresses. Using secondary IP addresses on the routers or access servers allows you to have two
logical subnets using one physical subnet.
•
Many older networks were built using Level 2 bridges. The judicious use of secondary addresses can
aid in the transition to a subnetted, router-based network. Routers on an older, bridged segment can
be easily made aware that many subnets are on that segment.
•
Two subnets of a single network might otherwise be separated by another network. This situation is
not permitted when subnets are in use. In these instances, the first network is extended, or layered
on top of the second network using secondary addresses.
Note
If any router on a network segment uses a secondary address, all other devices on that same segment
must also use a secondary address from the same network or subnet. Inconsistent use of secondary
addresses on a network segment can very quickly cause routing loops.
Note
When you are routing using the Open Shortest Path First (OSPF) algorithm, ensure that all secondary
addresses of an interface fall into the same OSPF area as the primary addresses.
To transparently bridge IP on an interface, you must perform the following two tasks:
•
Disable IP routing (specify the no ip routing command).
•
Add the interface to a bridge group, see the bridge-group command.
To concurrently route and transparently bridge IP on an interface, see the bridge crb command.
Examples
In the following example, 131.108.1.27 is the primary address and 192.31.7.17 and 192.31.8.17 are
secondary addresses for Ethernet interface 0:
interface ethernet 0
ip address 131.108.1.27 255.255.255.0
ip address 192.31.7.17 255.255.255.0 secondary
ip address 192.31.8.17 255.255.255.0 secondary
In the following example, Ethernet interface 0/1 is configured to automatically classify the source IP
address in the VRF table red:
interface ethernet 0/1
ip address 10.108.1.27 255.255.255.0
ip address 11.31.7.17 255.255.255.0 secondary vrf red
ip vrf autoclassify source
Related Commands
Command
Description
bridge crb
Enables the Cisco IOS software to both route and bridge a given protocol on
separate interfaces within a single router.
bridge-group
Assigns each network interface to a bridge group.
ip vrf autoclassify
Enables VRF autoclassify on a source interface.
match ip source
Specifies a source IP address to match to required route maps that have been
set up based on VRF connected routes.
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VRF-Autoclassify
ip address
Command
Description
route-map
Defines the conditions for redistributing routes from one routing protocol
into another, or to enable policy routing.
set vrf
Enables VPN VRF selection within a route map for policy-based routing
VRF selection.
show ip arp
Displays the ARP cache, in which SLIP addresses appear as permanent ARP
table entries.
show ip interface
Displays the usability status of interfaces configured for IP.
show route-map
Displays static and dynamic route maps.
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VRF-Autoclassify
ip vrf autoclassify
ip vrf autoclassify
To enable Virtual Routing and Forwarding (VRF) autoclassify on a source interface, use the ip vrf
autoclassify command in interface configuration mode. To remove VRF autoclassify, use the no form
of this command.
ip vrf autoclassify source
no ip vrf autoclassify source
Syntax Description
source
Defaults
The VFR autoclassify functionality is disabled.
Command Modes
Interface configuration
Command History
Release
Modification
12.2(27)SBA
This command was introduced.
Usage Guidelines
Specifies that the VRF classification is automatically performed based on the
source.
The ip vrf autoclassify command enables the capability to map packets from connected hosts to VRFs
that are different from the VRF defined on the ingress interface. It also enables the configuration of
policies that are required for the mapping of packets to the VRFs depending on whether the source
address of the packet belong to those connected routes.
The routing information can be learned dynamically or statically defined.
Examples
In the following example, the Fast Ethernet interface 0/0 is configured with two secondary addresses,
1.1.1.1/24 and 2.1.1.1/24. The first address, 1.1.1.1/24, is assigned to VRF red, while the other,
2.1.1.1/24, is assigned to VRF green. So in the VRF red table, a connected route 1.1.1.0/24 is installed,
while in VRF green, 2.1.1.0/24 is installed:
interface fast ethernet0/0
ip address 1.1.1.1 255.255.255.0 secondary vrf red
ip address 2.1.1.1 255.255.255.0 secondary vrf green
ip vrf autoclassify source
There is a default route in VRF red that directs all traffic to Fast Ethernet interface 1/0, while in VRF
green, another default route directs all traffic to Fast Ethernet interface 1/1. When packets arrive at Fast
Ethernet interface 0/0, they are mapped to either VRF red or VRF green based on their source address.
If the source address is 1.1.1.2, connected route 1.1.1.0/24 is used, and the packet is mapped to VRF red.
Following the default route, it is forwarded out of Fast Ethernet interface 1/0.
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VRF-Autoclassify
ip vrf autoclassify
The return packets are mapped to the VRF configured on the downstream interface. Refer to the ip vrf
forwarding command for more information in the Cisco IOS Switching Services Command Reference,
Release 12.3T.
Related Commands
Command
Description
ip address
Enables the Cisco IOS software to both route and bridge a given protocol on
separate interfaces within a single router.
ip vrf forwarding
Associates a VPN VRF with an interface or subinterface.
match ip source
Specifies a source IP address to match to required route maps that have been
set up based on VRF connected routes.
route-map
Defines the conditions for redistributing routes from one routing protocol
into another, or to enable policy routing.
set vrf
Enables VPN VRF selection within a route map for policy-based routing
VRF selection.
show ip arp
Displays the ARP cache, in which SLIP addresses appear as permanent ARP
table entries.
show ip interface
Displays the usability status of interfaces configured for IP.
show route-map
Displays static and dynamic route maps.
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VRF-Autoclassify
match ip source
match ip source
To specify a source IP address to match to required route maps that have been set up based on VRF
connected routes for Policy Based Routing (PBR), use the match ip source command in route-map
configuration mode. To remove the source IP address, use the no form of this command.
match ip source ip-address mask
no match ip source ip-address mask
Syntax Description
ip-address
Source IP address. The source address must match the VRF address
of the ingress interface.
mask
Source subnet mask.
Defaults
No source IP addresses are matched.
Command Modes
Route-map configuration
Command History
Release
Modification
12.2(27)SBA
This command was introduced.
Examples
In the following example, the source IP addresses are matched to the IP addresses configured for VRF
table red and green:
route-map new-dynamic-route-map permit 10
match ip source 10.1.10 255.255.255.0
set vrf red
route-map another-dynamic-route-map permit 20
match ip source 10.1.1.0 255.255.255.0
set vrf green
Related Commands
Command
Description
ip address
Sets a primary or secondary IP address for an interface.
ip vrf autoclassify
Enables VRF autoclassify on a source interface.
route-map
Defines the conditions for redistributing routes from one
routing protocol into another, or to enable policy routing.
set vrf
Enables VPN VRF selection within a route map for
policy-based routing VRF selection.
show ip arp
Displays the ARP cache, in which SLIP addresses appear as
permanent ARP table entries.
show ip interface
Displays the usability status of interfaces configured for IP.
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show ip arp
show ip arp
To display the Address Resolution Protocol (ARP) cache, where Serial Line Internet Protocol (SLIP)
addresses appear as permanent ARP table entries, use the show ip arp command in user EXEC or
privileged EXEC mode.
show ip arp [ip-address] [host-name] [mac-address] [interface type number] vrf vrf-name
Syntax Description
ip-address
(Optional) ARP entries matching this IP address are displayed.
host-name
(Optional) Host name.
mac-address
(Optional) 48-bit MAC address.
interface type number (Optional) ARP entries learned via this interface type and number are
displayed.
vrf
VRF table. The vrf-name argument is a specified VRF table name.
Command Modes
User EXEC
Privileged EXEC
Command History
Release
Modification
9.0
This command was introduced.
12.2(27)SBA
The vrf keyword and vrf-name argument were added.
Usage Guidelines
ARP establishes correspondences between network addresses (an IP address, for example) and LAN
hardware addresses (Ethernet addresses). A record of each correspondence is kept in a cache for a
predetermined amount of time and then discarded.
Examples
The following is sample output from the show ip arp command:
Router# show ip arp
Protocol
Internet
Internet
Internet
Internet
Internet
Internet
Address
171.69.233.22
171.69.233.21
171.69.233.19
171.69.233.30
172.19.168.11
172.19.168.25
Age(min)
9
8
9
49
Hardware Addr
0000.0c59.f892
0000.0c07.ac00
0000.0c63.1300
0000.0c36.6965
0000.0c63.1300
0000.0c36.6965
Table 1 describes the significant fields shown in the display.
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Type
ARPA
ARPA
ARPA
ARPA
ARPA
ARPA
Interface
Ethernet0/0
Ethernet0/0
Ethernet0/0
Ethernet0/0
Ethernet0/0
Ethernet0/0
VRF-Autoclassify
show ip arp
Table 1
show ip arp Field Descriptions
Field
Description
Protocol
Protocol for network address in the Address field.
Address
The network address that corresponds to the Hardware Address.
Age (min)
Age in minutes of the cache entry. A hyphen (-) means the address is local.
Hardware
Addr
LAN hardware address of a MAC address that corresponds to the network address.
Type
Indicates the encapsulation type the Cisco IOS software is using the network address in
this entry. Possible value include:
Interface
•
ARPA
•
SNAP
•
SAP
Indicates the interface associated with this network address.
The following is sample output from the show ip arp vrf command with the table name red specified:
Router# show ip arp vrf red
Protocol
Internet
Internet
Internet
Related Commands
Address
1.1.1.1
1.1.1.2
2.1.1.1
Age (min)
19
-
Hardware Addr
0050.a2de.7055
000a.f4b1.2b82
0050.a2de.7056
Type
ARPA
ARPA
ARPA
Interface
Ethernet3/1
Ethernet3/1
Ethernet3/2
Command
Description
ip address
Sets a primary or secondary IP address for an interface.
ip vrf autoclassify
Enables VRF autoclassify on a source interface.
match ip source
Specifies a source IP address to match to required route maps
that have been set up based on VRF connected routes.
route-map
Defines the conditions for redistributing routes from one
routing protocol into another, or to enable policy routing.
set vrf
Enables VPN VRF selection within a route map for
policy-based routing VRF selection.
show ip interface
Displays the usability status of interfaces configured for IP.
show route-map
Displays static and dynamic route maps.
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show ip interface
show ip interface
To display the usability status of interfaces configured for IP, use the show ip interface command in
privileged EXEC mode.
show ip interface [type number] [brief] secondary
Syntax Description
type
(Optional) Interface type.
number
(Optional) Interface number.
brief
(Optional) Displays a summary of the usability status information for each
interface.
secondary
Displays the secondary IP address and the VRF table configured for VRF
autoclassification.
Command Modes
Privileged EXEC
Command History
Release
Modification
10.0
This command was introduced.
12.0(3)T
This command was expanded to include the status of ip wccp redirect out
and ip wccp redirect exclude add in commands.
12.2(14)S
This command was expanded to display the status of NetFlow on a
subinterface.
12.2(15)T
The command output enhancements introduced in Cisco IOS Release
12.2(14)S were integrated into Cisco IOS Release 12.2(15)T.
12.3(6)
The command output was modified to identify the downstream VRF in the
output.
12.3(11)T
This command was integrated into Cisco IOS Release 12.3(11)T.
12.2(27)SBA
The secondary keyword was added and the output enhanced to display VRF
autoclassification.
Usage Guidelines
The Cisco IOS software automatically enters a directly connected route in the routing table if the
interface is usable. A usable interface can send and receive packets. If an interface is not usable, the
directly connected routing entry is removed from the routing table. Removing the entry allows the
software to use dynamic routing protocols to determine backup routes to the network, if any.
If the interface can provide two-way communication, the line protocol is marked “up.” If the interface
hardware is usable, the interface is marked “up.”
If you specify an optional interface type, you see information for that specific interface.
If you specify no optional arguments, you see information on all the interfaces.
When an asynchronous interface is encapsulated with PPP or Serial Line Internet Protocol (SLIP), IP
fast switching is enabled. A show ip interface command on an asynchronous interface encapsulated
with PPP or SLIP displays a message indicating that IP fast switching is enabled.
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show ip interface
Examples
The following example identifies a downstream VRF. The highlighted line (for documentation purposes
only) identifies the downstream VRF.
Router# show ip interface vi 3
Virtual-Access3 is up, line protocol is up
Interface is unnumbered. Using address of Loopback2 (2.0.0.8)
Broadcast address is 255.255.255.255
Peer address is 2.8.1.1
MTU is 1492 bytes
Helper address is not set
Directed broadcast forwarding is disabled
Outgoing access list is not set
Inbound access list is not set
Proxy ARP is enabled
Local Proxy ARP is disabled
Security level is default
Split horizon is enabled
ICMP redirects are always sent
ICMP unreachables are always sent
ICMP mask replies are never sent
IP fast switching is enabled
IP fast switching on the same interface is enabled
IP Flow switching is disabled
IP CEF switching is enabled
IP Feature Fast switching turbo vector
IP VPN CEF switching turbo vector
VPN Routing/Forwarding “U”
Downstream VPN Routing/Forwarding “D”
IP multicast fast switching is disabled
IP multicast distributed fast switching is disabled
IP route-cache flags are Fast, CEF
Router Discovery is disabled
IP output packet accounting is disabled
IP access violation accounting is disabled
TCP/IP header compression is disabled
RTP/IP header compression is disabled
Policy routing is disabled
Network address translation is disabled
WCCP Redirect outbound is disabled
WCCP Redirect inbound is disabled
WCCP Redirect exclude is disabled
BGP Policy Mapping is disabled
Table 2 describes the significant fields shown in the display.
Table 2
show ip interface Field Descriptions
Field
Description
Virtual-Access3 is up
If the interface hardware is usable, the interface is marked
"up." For an interface to be usable, both the interface
hardware and line protocol must be up.
Broadcast address is
Displays the broadcast address.
Peer address is
Displays the peer address.
MTU is
Displays the MTU value set on the interface.
Helper address
Displays a helper address, if one has been set.
Directed broadcast forwarding
Indicates whether directed broadcast forwarding is enabled.
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show ip interface
Table 2
show ip interface Field Descriptions (continued)
Field
Description
Outgoing access list
Indicates whether the interface has an outgoing access list
set.
Inbound access list
Indicates whether the interface has an incoming access list
set.
Proxy ARP
Indicates whether Proxy Address Resolution Protocol (ARP)
is enabled for the interface.
Security level
Specifies the IP Security Option (IPSO) security level set for
this interface.
Split horizon
Indicates that split horizon is enabled.
ICMP redirects
Specifies whether redirect messages will be sent on this
interface.
ICMP unreachables
Specifies whether unreachable messages will be sent on this
interface.
ICMP mask replies
Specifies whether mask replies will be sent on this interface.
IP fast switching
Specifies whether fast switching has been enabled for this
interface. It is generally enabled on serial interfaces, such as
this one.
IP Flow switching
Specifies whether Flow switching is enabled for this
interface.
IP CEF switching
Specifies whether Cisco Express Forwarding (CEF) is
enabled for the interface.
Downstream VPN Routing/Forwarding Specifies the VRF where the PPP peer routes and AAA
“D”
per-user routes are being installed.
IP multicast fast switching
Specifies whether multicast fast switching is enabled for the
interface.
IP route-cache flags are Fast, Flow init, Specifies whether NetFlow has been enabled on an interface.
CEF, Ingress Flow
Displays "Flow init" to specify that NetFlow is enabled on the
interface. Displays “Ingress Flow” to specify that NetFlow is
enabled on a subinterface using the ip flow ingress
command. Specifies “Flow” to specify that NetFlow is
enabled on a main interface using the ip route-cache flow
command.
Router Discovery
Specifies whether the discovery process has been enabled for
this interface. It is generally disabled on serial interfaces.
IP output packet accounting
Specifies whether IP accounting is enabled for this interface
and what the threshold (maximum number of entries) is.
TCP/IP header compression
Indicates whether compression is enabled or disabled.
WCCP Redirect outbound is disabled
Indicates the status of whether packets received on an
interface are redirected to a cache engine. Displays "enabled"
or "disabled."
WCCP Redirect exclude is disabled
Indicates the status of whether packets targeted for an
interface will be excluded from being redirected to a cache
engine. Displays "enabled" or "disabled."
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show ip interface
The following is sample output from the show ip interface brief command:
Router# show ip interface brief
Interface
Ethernet0
Ethernet1
Loopback0
Serial0
Serial1
Serial2
Serial3
IP-Address
151.108.0.5
unassigned
152.108.20.5
162.108.10.5
162.108.4.5
152.108.10.5
unassigned
OK?
YES
YES
YES
YES
YES
YES
YES
Method
NVRAM
unset
NVRAM
NVRAM
NVRAM
manual
unset
Status
up
administratively down
up
up
up
up
administratively down
Protocol
up
down
up
up
up
up
down
The method field has the following possible values:
•
RARP or SLARP—Reverse Address Resolution Protocol (RARP) or Serial Line Address
Resolution Protocol (SLARP) request
•
BOOTP—Bootstrap protocol
•
TFTP—Configuration file obtained from Trivial File Transfer Protocol (TFTP) server
•
manual—Manually changed by CLI command
•
NVRAM—Configuration file in nonvolatile RAM (NVRAM)
•
IPCP—ip address negotiated command
•
DHCP—ip address dhcp command
•
unassigned—No IP address
•
unset—Unset
•
other—Unknown
The following is sample output from the show ip interface secondary command for Ethernet interface
3/1:
Router# show ip interface secondary ethernet3/1
IP address/Mask
1.1.1.1/24
Related Commands
VRF
red
Command
Description
ip address
Sets a primary or secondary IP address for an interface.
ip vrf autoclassify
Enables VRF autoclassify on a source interface.
match ip source
Specifies a source IP address to match to required route maps
that have been set up based on VRF connected routes.
route-map
Defines the conditions for redistributing routes from one
routing protocol into another, or to enable policy routing.
set vrf
Enables VPN VRF selection within a route map for
policy-based routing VRF selection.
show ip arp
Displays the ARP cache, in which SLIP addresses appear as
permanent ARP table entries.
show route-map
Displays static and dynamic route maps.
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show route-map
show route-map
To display static and dynamic route maps, use the show route-map command in privileged EXEC mode.
show route-map [map-name | dynamic [dynamic-map-name | application [application-name]] |
all] [detailed]
Syntax Description
map-name
(Optional) Name of a specific route map.
dynamic
(Optional) Displays dynamic route map information.
dynamic-map-name
(Optional) Name of a specific dynamic route map.
application
(Optional) Displays dynamic route maps based on applications.
application-name
(Optional) Name of a specific application.
all
(Optional) Displays all static and dynamic route maps.
detailed
(Optional) Displays the details of the access control lists (ACLs) that
have been used in the match clauses for dynamic route maps.
Command Modes
Privileged EXEC
Command History
Release
Modification
10.0
This command was introduced.
12.0(22)S
An additional counter collect policy routing statistic was integrated in
Cisco IOS Release 12.0(22)S.
12.2(15)T
An additional counter collect policy routing statistic was integrated in
Cisco IOS Release 12.2(15)T.
12.3(7)T
The dynamic, application, and all keywords were added.
12.0(28)S
The support for recursive next-hop clause was added.
12.3(14)T
The support for recursive next-hop clause was integrated into Cisco IOS
Release 12.3(14)T. Support for the map display extension functionality was
added: The detailed keyword was added.
12.2(27)SBA
The output was enhanced to display dynamically assigned route maps to
VRF tables.
Usage Guidelines
For Cisco IO Releases 12.3(14)T and later releases, you can display the ACL-specific information that
pertains to the route map in the same display without having to execute a show route-map command to
display each ACL that is associated with the route map.
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show route-map
Examples
show route-map Command with No Keywords Specified Example
The following is sample output from the show route-map command:
Router# show route-map
route-map sid, permit, sequence 10
Match clauses:
tag 1 2
Set clauses:
metric 5
route-map sid, permit, sequence 20
Match clauses:
tag 3 4
Set clauses:
metric 6
Policy routing matches: 0 packets; 0 bytes
The following example shows Multiprotocol Label Switching (MPLS)-related route map information:
Router# show route-map
route-map OUT, permit, sequence 10
Match clauses:
ip address (access-lists): 1
Set clauses:
mpls label
Policy routing matches: 0 packets, 0 bytes
route-map IN, permit, sequence 10
Match clauses:
ip address (access-lists): 2
mpls label
Set clauses:
Policy routing matches: 0 packets, 0 bytes
Table 3 describes the significant fields shown in the display.
Table 3
show route-map Field Descriptions
Field
Description
route-map
Name of the route map.
permit
Indicates that the route is redistributed as controlled by the set
actions.
sequence
Number that indicates the position a new route map is to have in the
list of route maps already configured with the same name.
Match clauses
tag
Match criteria—conditions under which redistribution is allowed for
the current route map.
Set clauses
metric
Set actions—the particular redistribution actions to perform if the
criteria enforced by the match commands are met.
Policy routing matches
Number of packets and bytes that have been filtered by policy
routing.
show route-map Command with Dynamic Route Map Specified Example
The following is sample output from the show route-map command when entered with the dynamic
keyword:
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show route-map
Router# show route-map dynamic
route-map AAA-02/06/04-14:01:26.619-1-AppSpec, permit, sequence 0, identifier 1137954548
Match clauses:
ip address (access-lists): PBR#1 PBR#2
Set clauses:
Policy routing matches: 0 packets, 0 bytes
route-map AAA-02/06/04-14:01:26.619-1-AppSpec, permit, sequence 1, identifier 1137956424
Match clauses:
ip address (access-lists): PBR#3 PBR#4
Set clauses:
Policy routing matches: 0 packets, 0 bytes
route-map AAA-02/06/04-14:01:26.619-1-AppSpec, permit, sequence 2, identifier 1124436704
Match clauses:
ip address (access-lists): PBR#5 PBR#6
length 10 100
Set clauses:
ip next-hop 172.16.1.1
ip gateway 172.16.1.1
Policy routing matches: 0 packets, 0 bytes
Current active dynamic routemaps = 1
The following is sample output from the show route-map command when entered with the dynamic
and application keywords:
Router# show route-map dynamic application
Application - AAA
Number of active routemaps = 1
When you specify an application name, only dynamic routes for that application are shown. The
following is sample output from the show route-map command when entered with the dynamic and
application keywords and the AAA application name:
Router# show route-map dynamic application AAA
AAA
Number of active rmaps = 2
AAA-02/06/04-14:01:26.619-1-AppSpec
AAA-02/06/04-14:34:09.735-2-AppSpec
Router# show route-map dynamic AAA-02/06/04-14:34:09.735-2-AppSpec
route-map AAA-02/06/04-14:34:09.735-2-AppSpec, permit, sequence 0, identifier 1128046100
Match clauses:
ip address (access-lists): PBR#7 PBR#8
Set clauses:
Policy routing matches: 0 packets, 0 bytes
route-map AAA-02/06/04-14:34:09.735-2-AppSpec, permit, sequence 1, identifier 1141277624
Match clauses:
ip address (access-lists): PBR#9 PBR#10
Set clauses:
Policy routing matches: 0 packets, 0 bytes
route-map AAA-02/06/04-14:34:09.735-2-AppSpec, permit, sequence 2, identifier 1141279420
Match clauses:
ip address (access-lists): PBR#11 PBR#12
length 10 100
Set clauses:
ip next-hop 172.16.1.12
ip gateway 172.16.1.12
Policy routing matches: 0 packets, 0 bytes
Current active dynamic routemaps = 2
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show route-map
show route-map Command with Detailed ACL Information for Route Maps Specified Example
The following is sample output from the show route-map command with the dynamic and detailed
keywords entered:
Router# show route-map dynamic detailed
route-map AAA-01/20/04-22:03:10.799-1-AppSpec, permit, sequence 1, identifier 29675368
Match clauses:
ip address (access-lists):
Extended IP access list PBR#3
1 permit icmp 0.0.16.12 1.204.167.240 8.1.1.0 0.0.0.255 syn dscp af12 log-input fragments
Extended IP access list PBR#4
1 permit icmp 0.0.16.12 1.204.167.240 8.1.1.0 0.0.0.255 syn dscp af12 log-input fragments
Set clauses:
ip next-hop 172.16.1.14
ip gateway 172.16.1.14
Policy routing matches: 0 packets, 0 bytes
show route-map Command with VRF Autoclassification Example
The following is sampe output from the show route-map command when a specified VRF is configured
for VRF autoclassification:
Router# show route-map dynamic
route-map None-06/01/04-21:14:21.407-1-IP VRF, permit, sequence 0
identifier 1675771000
Match clauses:
Set clauses: vrf red
Policy routing matches: 0 packets, 0 bytes
Current active dynamic routemaps = 1
Related Commands
Command
Description
redistribute (IP)
Redistributes routes from one routing domain into another routing domain.
route-map (IP)
Defines the conditions for redistributing routes from one routing protocol
into another, or enables policy routing.
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show route-map
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