Monday, July 24, 2006

Migrating from RIPv1 to IGRP via route redistribution

If you run two different routing protocols in two different parts of your network, you need to redistribute routes between the two routing protocols. This session is an introduction to route redistribution by example.

In production you must be cautious about route redistribution because the route metric is not converted in a meaningful manner. This can result in routing loops.

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Sunday, July 9, 2006

Migrating from RIPv1 to IGRP via "ships in the night" routing

"Ships in the night" routing refers to two routing protocols which do not interact with each other.  We can migrate from one routing protocol to a more believable one by simply turning on the new protocol then turning off the old protocol.  Bug be careful to turn the new protocol on in the entire routing domain before turning off the old protocol.

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Wednesday, June 28, 2006

IGRP: Interior Gateway Routing Protocol

IGRP is a Cisco-proprietary routing protocol.  It is a classful distance vector protocol with a metric based on bandwidth and delay.  This is superior to RIP, whose metric is based on hop-count.  IGRP's classfulness makes it a bad choice for new deployments, but its advanced metric is worth study.