Optical Migration for
TDM Local Access
How Cisco IT Migrated TDM
Local Access from SONET to
OC-192 Infrastructure
A Cisco on Cisco Case Study: Inside Cisco IT
Presentation_ID
© 2007 Cisco Systems, Inc. All rights reserved.
Cisco Public
1
Overview
ƒ Challenge
Migrate Cisco San Jose headquarters campus local access
network from individual OC-48 SONET rings to a campus-wide
OC-192 SONET infrastructure
ƒ Solution
Cisco ONS 15454 switches in each Cisco building and four
local exchange carrier (LEC) points of presence (POP)
ƒ Results
Easier expansion of customer-provided access to additional
buildings, and greater control over capacity planning
ƒ Next Steps
Now that major circuits are migrated, migrate T1s
Presentation_ID
© 2007 Cisco Systems, Inc. All rights reserved.
Cisco Public
2
Background: Connecting Cisco
Employees to Outside World
ƒ Access to Cisco WAN, PSTN, or Internet requires
connectivity to public switched telephone network
(PSTN)
ƒ A local access network connects Cisco campus and the
local exchange carrier (LEC) or inter-exchange carrier
(IXC) point of presence (POP)
Local access network is based on synchronous optical
networking (SONET) technology
Presentation_ID
© 2007 Cisco Systems, Inc. All rights reserved.
Cisco Public
3
Background: The Legacy Cisco Local
Access Network
ƒ Cisco owned local
access infrastructure for
eight buildings with
highest circuit volume;
leased from LEC for
remaining 40+ buildings
ƒ When LEC owns local
access infrastructure,
capacity is often shared
by other nearby
companies
IXC POP
Cisco
Bldg
CO #2
Shared
SONET
Ring
Non-Cisco
Bldg
CO #1
IXC POP
Colo
Non-Cisco
Bldg
Cisco
Bldg
Drawback: potential project
delays while LEC
provisions more capacity
Presentation_ID
© 2007 Cisco Systems, Inc. All rights reserved.
Cisco Public
4
Background: Before, Six Disconnected
SONET Rings Touch Eight Buildings
Presentation_ID
© 2007 Cisco Systems, Inc. All rights reserved.
Cisco Public
5
Challenge: ‘Spot Solution’ for Local
Access No Longer Met Business Needs
ƒ Problems with Cisco’s legacy local access
infrastructure:
Difficulty of adding unlit buildings to SONET rings—or even
adding more SONET capacity to buildings on the rings
High management burden
Inefficient capacity planning: ring by ring
Large footprint and power requirements for legacy equipment
Presentation_ID
© 2007 Cisco Systems, Inc. All rights reserved.
Cisco Public
6
Challenge: Reduce Local Access Costs
ƒ If LEC owns local access infrastructure, Cisco pays
tariff rates
ƒ If Cisco owns local access infrastructure, Cisco pays:
One-time fee for infrastructure
Lower monthly usage fee for circuits
Whether customer-provided access or LEC-provided access is
more cost-effective comes down to volume
Presentation_ID
© 2007 Cisco Systems, Inc. All rights reserved.
Cisco Public
7
Solution: Campus-Wide Infrastructure
ƒ Interconnects 26 Cisco
buildings with four central
office locations
Multiple LEC locations provide
redundancy and fault tolerance
ƒ Cisco ONS 15454 switches in
each Cisco or LEC location
Presentation_ID
© 2007 Cisco Systems, Inc. All rights reserved.
Cisco Public
8
Solution: After, Two OC-192 Rings
Touch 26 Buildings
ADM
ADM
ADM
ADM
ADM
ADM
ADM
ADM
ADM
ADM
ADM
ADM
ADM
ADM
ADM
ADM
ADM
ADM
ADM
ADM
ADM
ADM
Presentation_ID
© 2007 Cisco Systems, Inc. All rights reserved.
Cisco Public
9
Solution: Cutover Process
ƒ The challenge: migrating more than 800 voice, video, and
data circuits without disruption!
ƒ For each circuit:
Cisco personnel removed circuit from production
SBC technician at Cisco repatched circuit from the legacy SONET
switch to the Cisco ONS 15454 switch
SBC technician at CO moved cross-connect at the same time
Cisco circuit owner verified proper operation and put it back into
service
Elapsed time: 5 to 10 minutes per circuit
ƒ Critical services experienced no down time, because
traffic was rerouted across a redundant path
Presentation_ID
© 2007 Cisco Systems, Inc. All rights reserved.
Cisco Public
10
Results: Easier Expansion to Additional
Buildings
ƒ Now 26 buildings instead of eight enjoy the benefits of
customer-provided access:
Cost savings
Simplified capacity planning
Reduced footprint and power requirements
ƒ Cisco IT can relatively easily extend its SONET
infrastructure to additional buildings as their local
access needs grow
Presentation_ID
© 2007 Cisco Systems, Inc. All rights reserved.
Cisco Public
11
Results: Greater Control Over Capacity
Planning
ƒ Expanded SONET infrastructure enables Cisco IT to
self-manage local access capacity in more buildings—
26 instead of 8
ƒ Cisco no longer must gamble that LEC can provide
additional capacity when needed
ƒ If a lab moves, Cisco IT provisioning team runs usage
and capacity reports on-demand to determine whether
additional circuits are needed
Presentation_ID
© 2007 Cisco Systems, Inc. All rights reserved.
Cisco Public
12
Results: Reduced Costs
ƒ Cisco paid one-time fee to the LEC for a dedicated
SONET structure
ƒ Monthly bills dropped 14% compared to the cost for
single-building connections
ƒ Real estate savings
New construction costs for San Jose campus =
$150 per square foot
Legacy equipment required 160 square feet, or $24,000
Savings for providing OC-48 access in 26 buildings =
$624,000
Additional savings: $6.65 per square foot in yearly operating
costs, or $27,664
PLUS, more space available for expansion or for other
network initiatives
Presentation_ID
© 2007 Cisco Systems, Inc. All rights reserved.
Cisco Public
13
Results: Reduced Footprint and Power
Consumption
Background: Legacy infrastructure to support OC-48
Foreground: Cisco ONS 15454 infrastructure to support OC-48 and
OC-192
Presentation_ID
© 2007 Cisco Systems, Inc. All rights reserved.
Cisco Public
14
Next Steps: Migrate T1 Circuits
ƒ Migration of large circuits is complete (May 2005)
T3, Gigabit Ethernet, OC-3, OC-12
ƒ Next up: T1 and primary rate interface (PRI) lines
ƒ To ensure uninterrupted phone service, Cisco IT will
“busy out” each circuit so that calls roll over to the next
line
ƒ Key to success: careful planning and coordination with
service provider!
Presentation_ID
© 2007 Cisco Systems, Inc. All rights reserved.
Cisco Public
15
To read the entire case study, or for additional Cisco IT case studies on a
variety of business solutions, visit Cisco on Cisco: Inside Cisco IT
www.cisco.com/go/ciscoit
Presentation_ID
© 2007 Cisco Systems, Inc. All rights reserved.
Cisco Public
16