From: Joe Jia (ellenjjl@xxxxxxxxxx)
Date: Tue Apr 02 2002 - 16:22:42 GMT-3
Hi,
You can refer TCP/IP Vol I,Jeff Doyle P787-P794 to solve the problem
----- Original Message -----
From: "Gregg Malcolm" <greggm@sbcglobal.net>
To: <ccielab@groupstudy.com>
Sent: Tuesday, April 02, 2002 1:48 PM
Subject: Mutual Redistribution Problem
> Folks,
>
> I'm having trouble with the following scenario. I set it up with the
purpose
> of playing with routing loops.
>
> ______ E0 - 150.50.30.2/27
> |
> R2
> / \
> / \
> / \
> R5 R6
> | |
> | |
> ---------------------
> |
> R7
>
> R2, R5 and R6 are on multipoint frame cloud. They run RIP in the address
> range 150.50.100.0/27.
> R5, R6 and R7 are on Ethernet. They run ospf in the address range
> 150.50.7.0/25
> R5 and R6 do mutual redist of RIP/OSPF.
> I have added a distribute-list on R5 and R6 that denies the 150.50.30
route
> from re-entering OSPF via the Ethernet. Prior to that (as you can
imagine),
> OSPF's lower admin dist caused R5 and R6 to see the subnet as OSPF. I've
> also prevented RIP from re-advertising the .30 subnet from OSPF. (I think
:))
>
> Problem is, when I do a trace from R7 to the .30 subnet, I get sub-optimal
> routing where it bounces from R6 to R5 back to R6 and then to .30. Both
R5
> and R6 show the .30 route as RIP with a next hop of R2. I've played
around
> with DR selection thinking that might be the problem, but no change.
> FLSM/VLSM issues have been addressed. R2 has 2 routes to the R5,R6,R7
> Ethernet and R7 has 2 routes to the .30 subnet.
>
> I'm fairly certain that I could remedy this with policy routing, but I'd
> rather not. I'd like to know why. Any ideas ? This one is kickin my
butt.
>
> Sorry if the ASCII art format is screwed up.
>
> Thanks, Gregg
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