On Mon, 4 Dec 2000, Mohamed Heeba wrote:
> guys !
> i have two routers connected through their serial , im configuring rip on
> them
>
> R1 e0 ip add is 172.16.1.1/27
> ser 0 ip add is 172.16.1.33/28
>
> R2 e0 ip add is 172.16.1.49/29
> ser 0 ip add is 172.16.1.34/28
>
> there is no rip updates between the two routers ..im getting only
> "suppressing null updates "
are you using rip v1? you need to use something that understands VLSM.
Otherwise split horizon will get you in the above case.
>
> also when i change the mask of ser0 on R1 to /27 , the updates pass normally
> and take the mask of the
> /28 on the other end
yes they use the mask of the interface they have that subnet on..........
>
> my question is
> Does this mean that if the mask is inconsistent on RIP router , it will not
> send updates ?????
you can't use inconsistant masks for a network running a FLSM protocol
like RIPv1. You have to either use like masks, or use a VLSM capible
protocol.
> this means when R1 mask is consistent (/27) for both interfaces , the R1
> will send updates but it will not receive anything because R2 masks are not
> consistent ??
>
brian
>
> somebody to confirm please !!!!!
>
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-----------------------------------------------
Brian Feeny, CCNP+ATM, CCDP [EMAIL PROTECTED]
Network Administrator
ShreveNet Inc. (ASN 11881)
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