From: Chris Allen (chris.allen@xxxxxxxxxxxx)
Date: Tue Aug 07 2001 - 09:14:40 GMT-3
IGRP has three types of Routing Updates...
network
subnet
external
By using the ip default-network x.x.x.x command you are designating the
network of x.x.x.x as an external route. IGRP assumes that external routes
are default routes therefore is becomes your GAWOL (Gateway of Last Resort).
Does anybody know what happens if you have two different external (default)
networks coming in to your network like in the below scenario?? What would
the routing table in RtB look like?
RtA---RtB---RtC
RtA
int eth0
ip add 192.168.5.1 255.255.255.0
int ser0
ip add 192.168.6.1 255.255.255.0
desc Connect to RtB
ip default-network 192.168.5.0
router igrp 100
net 192.168.5.0
net 192.168.6.0
RtB
int ser0
ip add 192.168.6.2 255.255.255.0
desc connect to RtA
int ser1
ip add 192.168.7.2 255.255.255.0
desc Connect to RtB
ip default-network 192.168.5.0
router igrp 100
net 192.168.6.0
net 192.168.7.0
RtA
int eth0
ip add 192.168.8.1 255.255.255.0
int ser0
ip add 192.168.7.1 255.255.255.0
desc Connect to RtB
ip default-network 192.168.8.0
router igrp 100
net 192.168.7.0
net 192.168.8.0
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Ryaboy Vadim
Sent: Monday, August 06, 2001 8:06 PM
To: 'ccielab@groupstudy.com'
Subject: Redistribution - Caslow book
In Bruce Caslow book chapter 12 (redistribution of IP routes) page
425 (page 421 in older edition) he lists two solutions for redistributing
between VLSM and FLSM
environments.
How do you configure solution two?: Announce an IP default-network
on the redistributing router into the IGRP domain. Enable IP classless on
all IGRP routers with the global configuration command "ip classless."
He does not provide an example on how to implement solution two.
Thanks,
Vadim
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