Tagged Redistribution Help (ROUTING)

chowzen

Hi all,

Just need some input here..

I understand the concept quite clearly - Traffic (packets) are tagged and with route-map and redistribution they are then stopped from being re-redistributed from a secondary router (full redistribution of 2 IGPs).

I have been playing with a lab, and either the lab is broken, or something I am doing is wrong. Here is the scenario::

(R1)Rip to (R2)Eigrp full redistribution. (R3) is in RIP, (R4) is in Eigrp.

After enabling full redistribution - a routing loop will occur as routes learned from R3 are distributed into the Eigrp domain, then advertised into RIP as eigrp traffic (from R3). Common error. One way of fixing it is by using a Route-map and tagging the traffic.

route-map rip-to-eigrp deny 10
match tag 1

route-map rip-to-eigrp permit 20
set tag 2

route-map eigrp-to-rip deny 10
match tag 2

route-map eigrp-to-rip permit 20
set tag 1

EIGRP AS > redistribute rip route-map rip-to-eigrp metric 1 1 1 1 1

RIP > redistribute eigrp (AS#) route-map eigrp-to-rip metric 6

If I understand this correctly :
traffic redistributed from rip into eigrp is tagged with (2) & permitted to enter & changed to eigrp traffic //
traffic redistributed from eigrp into rip is tagged with (1) & permitted to enter & changed to rip trafic //

Also, traffic that is then re-redistributed (looping) carries certain tags - those tags are denied/stopped/blocked --
ex -- rip is redistributed into eigrp - these routes are advertised to the rip domain - at this point it is blocked due to the tag (2) blocked by the route-map (eigrp-to-rip) that says that traffic tagged with tag (2) should be blocked. and vice~versa.

In my lab I am still getting loops and it seems that the redistribution is not working the way I think it should.

From the above - is there a problem ?

appreciate any help.

Dieg0M

Are you applying the route-maps on both redistributing routers?