From: R&S Groupstudy (rsg@synergy-networking.co.uk)
Date: Tue Nov 25 2003 - 14:14:01 GMT-3
Hi,
What you want to consider while redistributing is how do avoid loops.
You probably do not want to learn a route that you yourself advertised.
You can go about this by configuring access-lists / prefix-lists, and
masking off the routers that you want to advertise / don't want to learn etc
BUT - this becomes hardwork if you have a number of external routes that do
not fall nicely into your addressing scheme.
This method is obviously completely vadid through!!!
My recommendation is that you practice route tagging - understand what
routing protocols support this - and how to filter routes based on the tag.
This can turn many lines of access-list into far fewer lines of code.
example for mutual redistribution ospf/eigrp (assume mutual redistribition
is an issue since you have more than one router doing it...)
router eigrp 10
redistribute ospf 1 route-map ospf2eigrp
!
route-map ospf2eigrp deny 5
match tag 1
route-map ospf2eigrp permit 10
set tag 2
!
router ospf 1
redistribute eigrp 10 subnets route-map eigrp2ospf
!
route-map eigrp2ospf deny 5
match tag 2
route-map eigrp2ospf permit 10
set tag 1
!
This code above can be configured at all your redistribution points
regards
Adam
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
wboye@tiscali.ch
Sent: 25 November 2003 16:35
To: ccielab@groupstudy.com
Subject: hint wanted for clever redistribution
Hello colleagues,
I am working on redistribution between all different IGPs. I created a
topology like a circle isis-ospf-eigrp-isis again; at isis is a small
rip-domain hanging
I find it very challenging to make a good redistribution, what I give out
over isis to eigrp comes back over eigrp to ospf and back to isis again for
example
I worked with changing distances, with route tags and so on, but I still
feel a bit lost in the jungle.
Is it a jungle or are there some useful hints we can use to make life a bit
more comfortable?
Thanks and regards, William
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