Foundry Networks Switch and Router Installation And Configuration Manual page 502

Foundry Switch and Router Installation and Configuration Guide
As shown in Table 15.7, the results of the network-based IP load sharing algorithm provide evenly-distributed load
sharing. Figure 15.8 shows a network where a Layer 3 Switch has eight equal-cost paths to destination networks
N1 – N8. The Layer 3 Switch (R1) has been enabled to support up to eight IP load sharing paths.
IP Forwarding Cache
Network-Based Load Sharing
Destination Network Next Hop
R3
N1
R4
N2
R5
N3
N4 R6
N5 R7
N6 R8
R9
N7
R2
N8
R1
R1 is configured with eight
IP load sharing paths, and has
eight paths to networks N1 - N8,
attached to R10.
The cache entries in this example
are based on the assumption that
R1 receives traffic for N1 - N8, in
that order.
Figure 15.8 Network-based IP load sharing – example with eight equal-cost paths and eight destination networks
As shown in this example, the algorithm for network-based IP load-sharing does not select the paths beginning
with the first path, but the algorithm nonetheless results in an evenly distributed selection of paths.
Disabling or Re-Enabling Load Sharing
If you do not use IP load sharing and you want to disable the feature, use either of the following methods.
USING THE CLI
To disable IP load sharing, enter the following commands:
BigIron(config)# no ip load-sharing
Syntax: [no] ip load-sharing
15 - 60
R2
R3
R4
R5
R10
R6
R7
R8
R9
N1
N2
N3
N4
N5
N6
N7
N8
December 2000