home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.dcom.sys.cisco
- Path: sparky!uunet!mcsun!Germany.EU.net!incom!orfeo!peter
- From: Peter Radig <peter@orfeo.rhein-main.de>
- Subject: IGRP information on interfaces with secondary address
- Message-ID: <C0Ip95.Cr8@orfeo.radig.de>
- Phone: +49 69 746972
- Keywords: igrp, x25, secondary address, 9.0, 9.1
- Sender: peter@orfeo.radig.de (Peter Radig)
- Address: Palmengartenstr. 1, D-W6000 Frankfurt am Main 1, Germany
- Organization: Peter Radig EDV-Beratung, Frankfurt am Main, Germany
- Date: Fri, 8 Jan 1993 04:17:28 GMT
- Fax: +49 69 7411443
- Lines: 38
-
- Yesterday I searched for the reason our WAN connections didn't come
- up for over three hours for the following reasons.
-
- The configuration is a AGS running 9.0(1) / 9.0(2.6) / 9.1(1.3)
- (happens in either cases). The WAN connections run over a X.25
- interface with multiple SVCs. We use IGRP between the ciscos.
-
- The router was reloaded about six weeks ago.
-
- After that reload I added dynamically a SVC to this interface pointing
- to a site outside our company. For some reason the other site's
- administrator requested I had give our X.25 interface a secondary
- address with an IP number the others could deal with. So the
- config looked like
-
- interface serial 3
- encapsulation x25
- ip address 192.125.1.9 255.255.255.252 secondary
- ip address 192.125.253.2 255.255.255.0
-
- Yesterday I had to power-on-reset the router after a hardware upgrade.
- After that reload all WAN connections via X.25 didn't work. The
- reason I found was that all IGRP pakets send via broadcast on
- this interface had the secondary address as sender. (Before the
- reload but with the same configuration the primary address was
- was used to send the updates). But the remote routers were not prepared
- to accept these IGRP updates because they are on net 192.125.253.0
- only (they don't react on broadcasts with an other network address),
- so our dynamic routing on this interface failed completely.
-
- My question: Bug or feature? Or, more generally: If an interface
- has one primary and more than one secondary address is it predictable
- which address is used in the IGRP updates as sender?
-
- Thanks in advance.
-
- cu,
- Peter
-