Cisco Hands On Training Podcast

Latest Episodes:

Migrating from RIPv1 to IGRP via route redistribution Jul 24, 2006

Show notes

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.

Migrating from RIPv1 to IGRP via "ships in the night" routing Jul 09, 2006

Show notes

"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.

IGRP: Interior Gateway Routing Protocol Jun 28, 2006

Show notes

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.

RIPv1 distribute lists and offset-lists Jun 20, 2006

Show notes

RIP distribute lists deny specific route advertisements. RIP offset-lists increase the metric (hopcount) for specific route advertisements.

Problems with RIP Version 1 Jun 18, 2006

Show notes

RIP version 1 route advertisements do not include a field for the netmask. This means receiving routers have to gess the netmask based on whatever information they have available. That includes the "natural" netmask of that classful network. That also includes the receiving routers own configuration.

This means that variable length subnets and discontiguous classful network have problems with RIP version 1. The lack of the netmask field in the route advertisement is a real problem.

RIP Version 1 Jun 16, 2006

Show notes

RIP version 1 is a classful routing protocol. We cover the RIP packet format and configuration. We see examples of split horizon and triggered updates using the RIP debug commands.

Static routing and introduction to CEF Jun 12, 2006

Show notes

Routing protocols (and static routing) update the route table. The route table is used to forward packets. Cisco Express Forwarding (CEF) is a special route table optimized to forward packets more efficiently.

Serial and ethernet point-to-point links Jun 10, 2006

Show notes

We cable and configure ethernet and synchronous serial point-to-point links. In the next session these will be the "legs" of our triangle.

Classful IP addressing Jun 07, 2006

Show notes

Routers route packets based on the destination IP address: a 32-bit number included in the header of every IP packet. Historically, "large" sites were allocated IP address blocks starting with 0 (binary). Medium sites were allocated address blocks starting with the bits 10. "Small" sites were allocated address blocks starting with the bits 110.

Cisco 2500 password recovery Jun 02, 2006

Show notes

Every network engineer needs to be able to deal with a router with an unknown password. Whether you are taking over a site where the previous engineer was "hit by a bus", or scrounging routers from the storage closet, good network engineers can deal with routers with unknown passwords.

Our TOPPODCAST Picks

Follow Us

Stay Connected

Cisco Hands On Training Podcast

Related Podcasts

Links

Stay Connected