rip update metric=16

Answered Question
Mar 21st, 2009

Hi every body!

please consider the following case.

A router has following routes in routing table.

c 172.172.0.0/16 s0

c 172.173.0.0/16 s1

If this router receives an update 11.0.0.0 metric=16, Will the router ignore it?

thanks a lot and have a nice weekend!

I have this problem too.
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Correct Answer by vaughancahill about 7 years 10 months ago

The maximum number of hops in a path is 15. If a router receives a routing update that contains a new or changed entry, and if increasing the metric value by 1 causes the metric to be infinity (that is, 16), the network destination is considered unreachable. The downside of this stability feature is that it limits the maximum diameter of a RIP network to less than 16 hops.

If the router recieves a route for 11.0.0.0 with metric 16 the router will remove 11.0.0.0 from the routing table, and send a poision reverse to the router that sent the route posion this is so all routers in the same segment have recived the route poision.

So as you don't have the route in your table, and the metric is 16 the router will ignore the update.

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Correct Answer
vaughancahill Sat, 03/21/2009 - 17:04

The maximum number of hops in a path is 15. If a router receives a routing update that contains a new or changed entry, and if increasing the metric value by 1 causes the metric to be infinity (that is, 16), the network destination is considered unreachable. The downside of this stability feature is that it limits the maximum diameter of a RIP network to less than 16 hops.

If the router recieves a route for 11.0.0.0 with metric 16 the router will remove 11.0.0.0 from the routing table, and send a poision reverse to the router that sent the route posion this is so all routers in the same segment have recived the route poision.

So as you don't have the route in your table, and the metric is 16 the router will ignore the update.

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