Cisco Systems OL-12518-01 manual Scenario 4-Impact of Failover in the Core

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

Traffic Load vs Utilization

	40
	35
(%)	30
	25
Utilization
	20
	15
	10
	5
										132435
	0	20	30	40	50	60	70	80	90
	10									100

Traffic Load

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

Data Center High Availability Clusters Design Guide

OL-12518-01 4-27