From: Bill Hill (bhill@xxxxxxxxxx)
Date: Sun Mar 31 2002 - 22:52:27 GMT-3
Sure, try redistributing IGRP into OSPF and vice versa on a medium where split
horizon is not enabed by default. An OSPF route learned by IGRP will be redist
ributed back into OSPF meaning that the route will now be favored via the IGRP
router, hence causing a routing loop. Actualy in this case you will see the r
oute appear in the table then the router will state that the route is possibly
invalid, then will disappear completely and reappear.
In any case, proper use of distribute-lists, route-maps, enabling split horizon
will fix these issues. Key to remember is to be specific with your redistribu
tion so that you don't run into this issue. It does help to see it in action t
hough so try mocking it up in the lab.
HTH
-Bill
#8882
-----Original Message-----
From: ying chang [mailto:ying_c@hotmail.com]
Sent: Sunday, March 31, 2002 7:58 PM
To: ccielab@groupstudy.com
Subject: routing loop in single redistribution point?
Hi all,
In Solie's CCIE Pratical Studies errata for page 623, he took out the
following statement from the 'Caution' box: "If there is only one
redistribution point, inherent loop prevention whithin the routing protocol
will be sufficient enough to prevent loops". I can see multiple
redistributing points can cause routing loop as demonstrate in Doyle I's
Route Filtering chapter, but have troubles to see how a routing loop can be
fromed in a single redistribution point. Can someone give me an example of
such case?
Thanks,
Chang
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