Even though Rip does not send the mask in the routing update it must assume
some sort of mask. Why did it assume a 255.255.255.0 when the default is
255.255.0.0 for a class B network such as 172.16.0.0? The answer is that RIP
looks to see if the 172.16.0.0 network is present on the router. If it is, it
assumes that the mask of the network being advertised to it must have the same
mask. The router that you are doing a sho ip route on must have the 172.16.0.0
network on it somewhere with a 255.255.255.0 mask.
Earl Aboytes
Senior Network Consultant
GTE Managed Solutions
Kevin Wigle wrote:
> well I haven't got RIPv2 running to compare - which supports VLSM
>
> do a "sh ip proto" and see if your Rip is version 2
>
> Kevin Wigle
>
> ----- Original Message -----
> From: "m. jean stockton" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Thursday, 06 July, 2000 23:10
> Subject: Sh ip route rip command
>
> > why does the following result from the 'sh ip route rip' command when rip
> is
> > classful?
> >
> >
> > R 172.16.55.0 [120/2] via 172.16.20.2 255.255.255.0, 00:00:14,
> > Serial0
> > R 172.16.50.0 [120/2] via 172.16.20.2 255.255.255.0, 00:00:14,
> > Serial0
> > R 172.16.30.0 [120/2] via 172.16.20.2 255.255.255.0, 00:00:14,
> > Serial0
> > R 172.16.40.0 [120/2] via 172.16.20.2 255.255.255.0, 00:00:14,
> > Serial0
> >
> > however, if you just use the 'sh ip route' command, the subnet mask does
> not
> > appear.
> >
> > thanks
> >
> >
> > makeeda
> >
> > ___________________________________
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>
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