Configuring OSPFv3
Bogdan Doinea & Eric Kwok
Technical Manager
Cisco Networking Academy
Neighbor
Table
Topology
Table
Routing
Table
Neighbor
Table
Topology
Table
Routing
Table
Neighbor
Table
Topology
Table
Routing
Table
IPv4
IPv6
Neighbor
Table
Topology
Table
Routing
Table
• With the OPSFv3 Address Families features, the protocol supports both
IPv4 and IPv6
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Similarities between OSPFv2 and OSPFv3
Link-State
Yes
Routing Algorithm
SPF
Metric
Cost
Areas
Same multi-area hierarchy and
relationship
Packet Types
Hello, DBD, LSR, LSU, LSAck
Neighbor Discovery
Same states of transition in building an
adjacency
DR and BDR
Function and election process is the
same
Router ID
32-bit router ID: determined by the
same process in both protocols
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Differences between OSPFv2 and OSPFv3
Advertises
IPv4 Networks
IPv6 prefixes
Source Address
IPv4 global source
address
IPv6 link-local address
Destination Address
• Neighbor IPv4
addresses
• 224.0.0.5/6
• Neighbor IPv6 linklocal addresses
• FF02::5/6
Advertise Networks
Configured using the
network command in
router mode
Configured using the ipv6
ospf process-id area-id
command.
IP Unicast Routing
IPv4 unicast routing is
enabled
IPv6 unicast-routing not
enabled by default
Authentication
Plaint text and MD5
Based on IPSec in IPv6
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OSPFv2
OSPFv3
Router and Network LSAs
contain addressing information
Neither LSA 1 or 2 contain any
prefix or address information!
1. Router LSA – describe
directly-attached networks in the
area
1. Router LSA – describe the
state&cost of the router’s
interfaces in the area
2. Network LSA – generated by
the DR to describe all the
routers connected to the
segment
3. OSPFv3 Introduces 2 new
LSAs
• Link LSA
• Intra-area Prefix LSA
2. Network LSA – generated by
DR to describe the neighbors
connected to the segment
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Neighbor
Table
Topology
Table
Routing
Table
Link-Local Address
Neighbor
Table
Topology
Table
Routing
Table
Link-Local Address
• The source address is always the link-local address of the router
• The destination is either link-local or IPv6 multicast
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• In which of the below 3 options is:
unicast routing enabled by default?
IPSec used for authentication?
the protocol a Link-State Routing Protocol?
OSPF v2
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OSPF v3
Both protocols
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• In which of the below 3 does the protocol:
use cost as a metric?
elects a DR and BDR?
uses FF02::6 for DR and BDR multicasts?
uses 224.0.0.6 for DR and BDR multicasts?
OSPF v2
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OSPF v3
Both protocols
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Basic Configuration
(config)# ipv6 router ospf process-id
(config-rtr)# router-id 1.1.1.1
(config-rtr)# auto-cost reference-bandwidth 1000
(config)# interface fa0/0
(config-if)# ipv6 ospf 1 area 0
Reset OSPF process
#clear ipv6 ospf process
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#show ipv6 route ospf
#show ipv6 protocol
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#show ipv6 ospf
#show ipv6 ospf neighbor
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#show ipv6 ospf database
#show ipv6 ospf interface
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#debug ipv6 ospf adj
#debug ipv6 ospf event
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A::
RID: 1.1.1.1
AB::
A
Area 0
Prefix Length /64
C
C::
RID: 3.3.3.3
B
RID: 2.2.2.2
B::
Command:
show ipv6 ospf neighbor
show ipv6 ospf interface
show ipv6 ospf database
show ipv6 route ospf
show ipv6 protocol
debug ipv6 ospf adj
debug ipv6 ospf event
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• Ipv6 unicast must be enabled for OSPFv3
(config)#ipv6 router ospf 1
C
% IPv6 routing not enabled
• OSPFv3 router-id follows the same rule as OSPFv2 (IPv4).
You might need to configure it manually if not IPv4 address
presented
(config-if)#ipv6 ospf 1 area 0
C
%OSPFv3-4-NORTRID: OSPFv3 process 1 could not pick a routerid,please configure manually
• OSPFv3 is enabled by the interface sub command not the
network statement
• The next-hop address is link-local address, not global
unicast address
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Implementing OSPF for IPv6
http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6ospf.html
Implementing IPsec in IPv6 Security
http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6ipsec.html
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