From: Rick Burts (burts@xxxxxxxxxxxxxx)
Date: Thu Apr 19 2001 - 14:51:01 GMT-3
Justin
As a general statement it is true that RIPv1 does not support VLSM.
But that is not an absolute truth. There are a couple of circumstances
where a router running RIPv1 may show several different masks within a
particular network. The example you enclosed shows a /24 as the normal
mask of a subnet of the class B and it also shows some /32 host routes.
RIP does support host routes. You might also have some interface on
the router configured with a different mask which would make the table
contain 3 masks. (This last situation does introduce some problems in
the propagation of route information in the updates and is not a
recommended practice).
Rick
Rick Burts, CCSI CCIE 4615 burts@mentortech.com
Mentor Technologies 240-568-6500 ext 6652
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On Thu, 19 Apr 2001, Dean, Justin wrote:
> I ran into something that seemed odd to me. I am running RIP ver 1 and I am
> getting "Network 137.1.0.0 is variable subnetted, 11 subnets, 2 Masks" I
> thought that Rip V1 did not support vlsm any way, shape, or form. Can
> someone shed some light on this. Thanks, justin
>
> ----ospf----R2----rip v1------R1---rip---
>
> R1's ip routes:
>
> C 192.168.123.0/24 is directly connected, FastEthernet0/1
> 1.0.0.0/32 is subnetted, 1 subnets
> C 1.1.1.1 is directly connected, Loopback100
> 137.1.0.0/16 is variably subnetted, 11 subnets, 2 masks
> R 137.1.11.1/32 [120/6] via 137.1.50.2, Serial0/0
> R 137.1.10.0/24 [120/6] via 137.1.50.2, Serial0/0
> R 137.1.12.0/24 [120/6] via 137.1.50.2, Serial0/0
> R 137.1.13.0/24 [120/6] via 137.1.50.2, Serial0/0
> R 137.1.6.6/32 [120/6] via 137.1.50.2, Serial0/0
> R 137.1.4.4/32 [120/6] via 137.1.50.2, Serial0/0
> R 137.1.3.3/32 [120/6] via 137.1.50.2, Serial0/0
> R 137.1.2.2/32 [120/6] via 137.1.50.2, Serial0/0
> C 137.1.1.0/24 is directly connected, Loopback0
> R 137.1.5.0/24 [120/1] via 137.1.50.2, Serial0/0
> C 137.1.50.0/24 is directly connected, Serial0/0
> S* 0.0.0.0/0 [1/0] via 192.168.123.254
>
> Justin M. Dean, CCNP, CCDP
> Network Engineer
> NRT, Incorporated
> (949)367-3438
> justin.dean@nrtinc.com
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