RIP/IGRP VLSM question

Hi All,

Was wondering if anyone could help me on a VLSM question I have.

Suppose I have a network of 5 routers.

R1-R2-R3-R4-R5

Router1: f0/1: 172.16.70.17/28 s01: 172.16.80.2/24

Router2: s0/1: 172.16.80.1/24 s0/0: 172.16.20.1/24

Router3: s0/1: 172.16.20.2/24 s0/0: 172.16.40.1/24

Router4: s0/1: 172.16.50.1/24 s0/0: 172.16.60.1/24

Router5: s0/1: 172.16.60.2/24 f0/0: 172.16.70.1/28

Each router is running RIPv1 and advertising its local network using classful addresses, e.g. Router1 config would be

router rip network 172.16.0.0

The ethernet interface on R5 (172.16.70.1/28) to the ethernet interface on R1 (172.16.70.17/28). The classful address within the network is the same, so it's not a discontigious one, but there are different subnet masks in use (/24 and /28). I've tried this on a router simulator and it works, but I'd just like to be sure.

I understand that RIP and IGRP don't work with VLSM's, but is this only if there are two different classful addresses?

Many thanks in advance

Reply to
dilan.weerasinghe
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Hi Dilan,

You are right RIPv1 dos not support VLSM because RIPv1 is a classfull protocol and VLSM needs a classless protocol like EIGRP, RIPv2 and OSPF. The router simulator is not correct, it should not work.

snipped-for-privacy@gmail.com wrote:

Reply to
Alan S

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