From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Tue Aug 08 2006 - 14:53:28 ART
OSPF does not require devices to be on the same subnet to
establish adjacency, so it should work fine. In RIP this behavior can
be disabled with the "no validate-update-source" process level command.
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987 x 705
Outside US: 775-826-4344 x 705
24/7 Support: http://forum.internetworkexpert.com
Live Chat: http://www.internetworkexpert.com/chat/
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Olopade Olorunloba
> Sent: Tuesday, August 08, 2006 12:37 PM
> To: 'Schulz, Dave'; 'Cisco certification'
> Subject: RE: Routing through a ppp ipcp negotiated interface
>
> OSPF does not form because the mask negotiated is a host route, and
> therefore the router believes that the remote end is not on the same
> subnet.
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Schulz, Dave
> Sent: 04 August 2006 21:41
> To: Cisco certification
> Subject: Routing through a ppp ipcp negotiated interface
>
> I discovered something interesting while setting up a network in my
lab
> with using ppp ipcp to negotiate the address across a serial link. In
> the following scenario, the address is negotiated fine. However, I am
> trying to run the various protocols across the link. EIGRP, but RIP
> will not allow the database to be received at the router with the
> negotiated interface. OSPF will not allow the adjacency to form.
> BTW....I can get the routes to be sent from the negotiated interface
to
> the remote (negotiating) interface of the remote router. I am just
> trying things and investigating ....so this may not be valid to do
this.
> Just wondering why EIGRP works in this way, but OSPF and RIP do not.
> Thoughts?
>
> On RIP...I get the following debug error.....(I tried this both
> multicast and unicast updates, with no difference).
>
> *Mar 16 11:07:12.927: RIP: ignored v2 update from bad source 25.5.5.5
on
> Serial0/1
>
> Here are the configs at the interface level......
>
> R3.....
>
> !
> interface Serial1
> ip address negotiated
> encapsulation ppp
> end
>
>
> R5......
> !
> interface Serial0/1
> ip address 35.5.5.5 255.255.255.0
> encapsulation ppp
> peer default ip address 35.5.5.3
> clock rate 2000000
> end
>
>
>
> Dave Schulz, CCDP, CCNP, CCSP
> Email: dschulz@dpsciences.com <mailto:dschulz@dpsciences.com >
>
>
This archive was generated by hypermail 2.1.4 : Fri Sep 01 2006 - 15:41:56 ART