From: Schulz, Dave (DSchulz@dpsciences.com)
Date: Thu May 18 2006 - 01:40:20 ART
Chris - This will work fine for the configuration that you have below.
However, let's take a look at what is necessary and what may be
"over-configuration"....
For routes that are redistributed from ospf to eigrp....you have ospf
routes at an admin distance of 110, being redistributed into eigrp,
making them eigrp external route with an administrative distance of
170....so, these routes will never be redistributed back into ospf from
eigrp. No other special handling is needed here.
On the routes going from eigrp to ospf.... you have eigrp routes at an
admin distance of 90, being redistributed into ospf (admin 110)....only
the native routes will be redistributed. Those learned by ospf will not
show up in the routing table, since eigrp has a lower administrative
distance.
Keep in mind, this is only being the two routing protocols. However, if
you have external router (for example, from RIP) being learned at two
point...this becomes more of an issue and tagging and filter may be
necessary. It is good to follow each route as it goes through the
router to help understand what the router is doing with the
redistribution process. I hope this helps.... please let me know if I
overlooked something or missed a part of this.
Dave Schulz,
Email: dschulz@dpsciences.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Guzman, Chris
Sent: Wednesday, May 17, 2006 5:42 PM
To: ccielab@groupstudy.com
Subject: Mutual Redistribution w Route Maps
When doing mutual redistribution between OSPF and RIP or EIGRP on the
same router is it acceptable to use the following method using
route-maps to tag routes going from EIGRP to OSPF and vice versa, and
then to deny those routes from being redistributed back into the
originating protocol based on that tag setting. I find this method much
simpler than trying to identify specific routes for redistribution with
ACLs or taging the routes at the originating routers. Any comments on
this would be appreciated
router eigrp 100
redistribute ospf 10 metric 256 1000 255 1 1500 route-map ospf2eigrp
network 136.10.69.0 0.0.0.15
no auto-summary
!
router ospf 10
router-id 136.10.6.6
log-adjacency-changes
redistribute eigrp 100 subnets route-map eigrp2ospf
passive-interface Loopback0
network 136.10.6.6 0.0.0.0 area 0
network 136.10.100.0 0.0.0.31 area 0
route-map ospf2eigrp deny 10
match tag 900
!
route-map ospf2eigrp permit 20
set tag 500
!
route-map eigrp2ospf deny 10
match tag 500
!
route-map eigrp2ospf permit 20
set tag 900
!
Thanks....
5 days to go...
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