i believe that i shouldnt use different masks on Ripv1 router , i was trying
to check if the mask will be changed on the other end of the connection
(which is right :)) , although now this doesnt have any meaning since the
serial link should aslo have the same mask of the ethernet subnet of the
source router (which will force me to make consistant mask for the entire
network to make everything work fine )
i dont think split horizon has anything here ...hasnt it ??
thx for the help
> -----Original Message-----
> From: Brian [SMTP:[EMAIL PROTECTED]]
> Sent: Monday, December 04, 2000 3:50 PM
> To: Mohamed Heeba
> Cc: '[EMAIL PROTECTED]'
> Subject: Re: Rip problem , suppressing null update!
>
> 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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