From: Ronnie Royston (RonnieR@xxxxxxxxxxxxxxxxx)
Date: Wed Nov 01 2000 - 16:36:55 GMT-3
IGRP load balances over 4 paths of equal cost by default. So, if you add 2
more routers between your Rtr A and destination net on that e-net segment,
you'll see 4 routes instead of the two. This number is configurable
(maximum-paths command) up to 6 in 11.0 and later. To experiment, try
manipulating the dalay and/or bandwidth on the middle routers interfaces to
change the path costs and use the 'variance' command to observe unequal cost
load balancing with an access list permitting icmp any any, a debug ip
packet [acl #] and extended ping with count = 20 or something. Have fun....
-----Original Message-----
From: Mike.Wiley@equant.com [mailto:Mike.Wiley@equant.com]
Sent: Wednesday, November 01, 2000 11:08 AM
To: ccielab@groupstudy.com
Subject: IGRP Question
Can anyone confirm why I might have 2 routes appear in the routing table for
an
IGRP internal route.
Existing example:
RouterA is connected to an Ethernet segment where 2 routers reside (routerB
&
C). The remote destination from RouterA is hanging off of RoutersB & C's
'E'
interfaces (They are running HSRP also). Remote network is 144.10.1.0, and
when
I show ip route on RouterA, I see two possible routes to this network via
B's e0
and C's e0. Why? Routing information should be best path only, EIGRP uses
feasible successor not IGRP. Is this inherent to an ethernet environment
where
multiple routes can exist in the routing table?
Thanks in advance,
Michael Wiley
Internetworking Operations Engineer
mike.wiley@equant.com
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 08:25:39 GMT-3