From: ccie2be (ccie2be@nyc.rr.com)
Date: Tue May 24 2005 - 10:07:58 GMT-3
Hi guys,
I've been playing around with this myself.
Here's the situation.
I have 3 rip routers all connected by an ethernet segment.
R1's is connected to this ethernet segment via its e0/0 interface.
I want R1 to advertise a default route out its e0/0 interface but not any
other rip enabled interfaces.
This is R1's int e0/0 config:
interface Ethernet0/0
ip address 192.10.7.3 255.255.255.0
ip rip authentication mode md5
ip rip authentication key-chain RIP
ip summary-address rip 0.0.0.0 0.0.0.0
This default route wasn't showing up in the route tables on the other rtr's
on the segment, so I enabled debug ip rip on R1.
*Mar 1 20:54:36.242: RIP: sending v2 update to 224.0.0.9 via Ethernet0/0
(192.1
0.7.3)
*Mar 1 20:54:36.242: RIP: build update entries
*Mar 1 20:54:36.242: 0.0.0.0/0 via 0.0.0.0, metric 16, tag 0
Notice the metric 16 on the line above.
OK, so that's why the default route isn't showing up on the other routers.
But, the question is this: Why is R1 tagging this route with a metric of
16?
This is further confirmed by this debug output from another router on this
segment:
20:59:19: RIP: received v2 update from 192.10.7.3 on Vlan32
20:59:19: 0.0.0.0/0 via 0.0.0.0 in 16 hops (inaccessible)
Another question is this: What method, if any, exists to make this default
summary route have a lower hop count?
I know I haven't solved the problem, but, hopefully I've added clarity to
the issue.
Tim
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Dave
Bregman
Sent: Tuesday, May 24, 2005 4:10 AM
To: B Kim; John Matus; ccielab@groupstudy.com
Subject: RE: rip default route
I seem to remember reading somewhere that the 'ip summary-address rip'
command only works if you disable split-horizon on the interface also.
Regardless if it's a multipoint interface or not. I'm not sure why you
would have to though. I've seen sample labs that ask you to send a RIP
default route to a specific router and not use the 'default-information
originate' command. My guess is that it would be good to know this for
the test.
Dave Bregman
CCIE #14626
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of B Kim
> Sent: Monday, May 23, 2005 7:33 PM
> To: 'John Matus'; ccielab@groupstudy.com
> Subject: RE: rip default route
>
>
> John
>
> I tried it on my lab. It doesn't seem to work.
> I haven't seen this case in any workbooks so far.
>
> You may already know that, the best way to originate the default route
> in RIP is configuring "default-information originate" with filtering
> such as distribute-list out.
>
> Beomsu Kim
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of
> John Matus
> Sent: Monday, May 23, 2005 8:05 PM
> To: ccielab@groupstudy.com
> Subject: rip default route
>
> can you inject a rip default route out an interface with:
>
> ip summary-address rip 0.0.0.0 0.0.0.0 ?
>
> i know you can do it w/ eigrp but i'm not sure about rip. i
> labbed them
>
> both and got no results...
>
> TIA.
>
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