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Data Center High Availability Clusters Design Guide
OL-12518-01
Chapter 4 FCIP over IP/MPLS Core
Testing Scenarios and Results
The test results reveal that the maximum traffic that can be transported across the Cisco 7500 as PE is
around 35 percent, as shown in Figure 4-16.
Figure 4-16 Traffic Load versus Utilization Test Results
Scenario 4—Impact of Failover in the Core
No convergence testing was done with this FCIP testing. SP backbone convergence depends on the
different protection mechanisms deployed in the network at different layers. In general, the following
numbers are valid about convergence speed:
• Optical layer—Less than 50 ms
• SONET/SDH—Less than 60 ms
• IP (IGP convergence) variable(s)—With fine IGP tuning, sub-second is achievable for deployment
• MPLS Fast Reroute—Less than 50 ms
In the case of an MPLS backbone, Label Distribution Protocol (LDP) convergence also has to be taken
into consideration. The convergence of this protocol depends on the particular mode of operation that is
being used: frame mode or cell mode.
Scenario 5—Impact of Core Performance
MPLS provides an efficient mechanism for supporting VPN VRFs. With a VRF, the traffic of a given
enterprise or group passes transparently through the Internet in a way that effectively segregates that
traffic from other packets on the internet, offering performance guarantees and security.
The total number of routes and VPN supported is dependent on a number of factors, including platform,
linecards, and topology. Note the following conditions:
• VRF limits are constrained mainly by CPU
• VPN and global route limits are constrained mainly by available memory
Traffic Load vs Utilization
0
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10 20 30 40 50 60 70 80 90 100
Traffic Load
Utilization (%)
132435