nanog mailing list archives

Re: Receiving route with metric 0


From: Glen Kent <glen.kent () gmail com>
Date: Wed, 7 Dec 2005 11:46:37 +0530


Am all the more confused now :)


In pre-RFC1058 implementations the sender increments the metric, so a
directly-connected route's metric is 1 on the wire.

In post-RFC1058 implementations the receiver increments the metric, so
a directly-connected route's metric is 0 on the wire.

In both cases, the metric in a reciever's database one hop away is 1.

Lets say we have A -- B. A is pre-RFC1058 and B is post RFC 1058. A
sends a directly connected route as 1. B increments this by 1, and
thus stores it as 2.


You appear to have it backwards. As it says in the section you quoted,

       "These two viewpoints result in identical update messages being
       sent."

Either approach results in messages with metric 1. The metrics on the

Hmmm .. not sure. A post 1058 implementation would send a metric 0 for
a directly connected route, assuming that the other end would
increment the value and things would work out fine.

Thanks,
Glen


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