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New Member

RIP and VLSM

What will happen when I try to redistribute a subnet (i.e. 10.3.0.0) from OSPF into RIP? (10.0.0.0 or subnet not exist in the RIP domain)

1 ACCEPTED SOLUTION

Accepted Solutions
Silver

Re: RIP and VLSM

Since RIP v1 does not pass subnet mask information the only way that a RIP speaking router would place a mask on a learned network is based on the Mask that is configured on it's local interfaces. So, if your 10.2.0.0 was a /24 for example and the 10.0.0.0 came into this router. This router would apply a /24 bit mask to it. RIP V2 does not have this limitation..nor do most other commonly used Classless routing protocols.

Hope that helps,

Don

4 REPLIES
Silver

Re: RIP and VLSM

Since RIP is classful it would distribute the classful address from your redistributed 10.3.0.0/x as 10.0.0.0/8.

Hope this helps you,

Don

New Member

Re: RIP and VLSM

Thanks Don.

And what will the router do if a net 10.2.0.0 is configured in his RIP domain?

Silver

Re: RIP and VLSM

Since RIP v1 does not pass subnet mask information the only way that a RIP speaking router would place a mask on a learned network is based on the Mask that is configured on it's local interfaces. So, if your 10.2.0.0 was a /24 for example and the 10.0.0.0 came into this router. This router would apply a /24 bit mask to it. RIP V2 does not have this limitation..nor do most other commonly used Classless routing protocols.

Hope that helps,

Don

Silver

Re: RIP and VLSM

One more thing to keep in mind ,When you redistribute Rip will apply the OSPF metric , make sure you apply a new metric when redistributing

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