Avaya Configuring IP, ARP, RARP, RIP, and OSPF Services Manuel d'utilisateur télécharger pdf (Page 77)

Configuring and Customizing IP

308627-14.20 Rev 00

3-17

When enabled, ECMP works as follows:

• If the current best routes to the destination are better than the new route, the

router discards the new route.

• If the new route is better than the current best routes, the router replaces the

current routes with the new one.

• If the new route and the current route have the same cost, the router adds the

new route to the routing table (up to the configured maximum). If the routing

table already contains the maximum number of equal-cost routes, IP discards

the new route.

To enable ECMP:

1. Select one of the three methods of distribution for equal-cost routes.

2. Set the maximum number of equal-cost paths that are supported to an

integer from 2 through 12.

When you enable ECMP, you can also configure up to 12 ECMP static routes. If

you then configure two or more static routes to the same destination network, with

the same cost, but with different next hops, these static routes are considered

ECMP static routes and the traffic for this destination is balanced across these next

hops. You disable ECMP static routes by disabling ECMP.

Using the BCC

To enable or disable equal-cost multipath support, go to the global IP prompt (for

example,

box; ip

) and enter:

ecmp-method

method

is one of the following:

disabled

(default)

round-robin

src-dest-hash

dest-hash

To specify the maximum number of equal-cost paths for RIP, go to the global IP

prompt (for example,

box; ip

) and enter:

rip-max-paths

<max_number>

max_number

is an integer from 1 (the default) through 12.

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Avaya Configuring IP, ARP, RARP, RIP, and OSPF Services Manuel d'utilisateur Page 77