From: Joseph Brunner (joe@affirmedsystems.com)
Date: Wed Oct 24 2007 - 18:06:39 ART
Wait slow down...
You only NEED to use redistribution with route-tags when you have more than
1 router doing mutual route re-distribution. We use the tags to block route
feedback. That is, if a route has been redistributed already at either
router it wont be re-redistributed back to the source protocol at the other
router.
Here is an example... R3 and R4 are redistributing between EIGRP & OSPF. To
prevent a loop we don't allow route feedback from a protocol back into a
protocol. Anything going from OSPF to EIGRP, and EIGRP to OSPF is tagged and
the redistribution at other router denies routes with that tag before
redistribution. The tags allow us to know WHERE that route originally came
from.
Here is the topology
R1---OSPF--- R3--- EIGRP-AS-10--- R5
| |
R2---OSPF--- R4--- EIGRP-AS-10--- R6
R3&R4
Router ospf 1
Redis eigrp 10 subnets route-map watch-tag
Router eigrp 10
Redistribute ospf 1 route-map watch-tag metric 1500 100 255 1 1500
Route-map watch-tag deny 5
Match tag 5
Route-map watch-tag permit 10
Set tag 5
Try it with my topology in your dynamips...
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Jeffrey Biggs
Sent: Wednesday, October 24, 2007 4:48 PM
To: ccielab@groupstudy.com
Subject: Redistribution with route tags are KILLING ME!!!`
I have been trying to grasp the use of redistribution using only route tags,
but I just keep getting killed by it. I can redistribute using prefix-lists
and ACL's all day long, but I know I am going to see something where I need
to "make sure all IP's are fully reachable without the use of
ACL's/Prefix-lists" and I am going go down in flames..Is there someone out
there that has a solution that can help me??????? I have used NMC and
IPEXPERT (BOTH VERY GOOD TOOLS, NOT KNOCKING ANY OTHERS) but my brain is
just not grasping the concept.
HELP!!!!!!!
Thanks
JB
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