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Configuring IP Services
4-20 117356-A Rev. A
Configuring RIP and OSPF for Equal-Cost Multipath Support
By default, the IP routing table contains a single “best” RIP route and single best
OSPF route to a given destination. If either protocol submits another route to the
same destination, IP compares the new route with the current route. If the new
route is better, IP replaces the current route with the new route. If not, IP discards
the new route.
If you have enabled equal-cost multipath support on the router, IP can store
multiple equal-cost best RIP and OSPF routes in the routing table. When RIP or
OSPF submits a route to a destination, one of the following events occurs:
IP determines that the current route to that destination is better than the new
route. IP discards the new route.
IP determines that the new route is better than the current route. IP discards
the current route and replaces it with the new route. In the event that the
routing table contains multiple equal-cost best routes, IP discards all of these
routes.
IP determines that the new route and the current route have the same cost. IP
adds the new route to the routing table -- up to a maximum number that you
specify. If the routing table already contains the maximum number of
equal-cost routes from RIP or OSPF, IP discards the route.
You can use the BCC and Site Manager to specify the number of equal-cost routes
(up to five) that IP can store in the routing table for RIP and OSPF.
Using the BCC
To specify the maximum number of equal-cost paths for RIP, navigate to the IP
global prompt and enter
rip-max-paths
max_number
max_number is an integer from 1 (the default) to 5.
To specify the maximum number of equal-cost paths for OSPF, navigate to the IP
global prompt and enter
ospf-max-paths
max_number
max_number is an integer from 1 (the default) to 5.
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