Tag for Route-Maps doesn't work when redistribute EIGRP to BGP

[fan.gao@academy.com]

Hi all

I have ASR1001-X router has EIGRP and BGP running .

I created route-map for manage traffic redistribute from EIGRP to BGP

however, I found out route map doesn't work when I use " match tag "

Example #1

I tag 1000 to all routes advertise from BGP to EIGRP

******

route-map bgp-to-eigrp permit 10

set tag 1000

!

*******

then I match this tag when I redistribute network from EIGRP to BGP

***********

route-map eigrp-to-bgp deny 20

match tag 1000

!

route-map eigrp-to-bg permit 50

************

But the result is all EIGRP routes are denied , there is nothing in BGP routing table with route-map "eigrp-to-bgp"

Example #2:

I also tried tag one subnet in EIGRP with tag 2000 as follow :

sh ip eigrp to | i 172.16.63
P 172.16.63.0/24, 1 successors, FD is 262656, tag is 2000

then I only want to redistribute this subnet into BGP by following configuration

****************

route-map eigrp-to-bg permit 10

match tag 2000

!

But the result is I see all networks redistribute from EIGRP to BGP included the traffic learned from BGP ( tag 1000 ) .

So , based on above 2 examples , the result to me is "match tag xxxx" in route-map didn't work somehow . by the way , when I use match ACL , it works

[Georg Pauwen]

Hello,

how do you redistribute between EIGRP and BGP and vice versa ? Post the full configuration of your ASR...

[Giuseppe Larosa]

Hello Fan,

BGP has its own attributes like BGP community that is even better then a route tag because multiple BGP communities can be applied to same prefix.

I would try using BGP communities on BGP side to see if there is a difference.

Route tags and matching on them work well between EIGRP and OSPF or EIGRP and IS IS.

To be noted RIPv2 route tags should be 16 bit integer while EIGRP, OSPF and IS IS use 32 bit integer route tags.

Hope to help

Giuseppe

[fan.gao@academy.com]

Thanks for everyone's reply , let me put more details here :

Originally ,All remote sites are in super net :172.16.0.0/16" and advertised by BGP AS 13979, then redistribute into EIGRP by match ACL 30 . in order to prevent the loop , 172.16.0.0/16 in ACL 30 will deny to send back to BGP AS 13979.

Now , I am migrating remote a site to Meraki as POC. I have one site with 172.16.63.0/24 needs advertise into BGP in order to other remote sites to connect it ,so I tag the network learned from Meraki with tag 2000 and permit it into BGP , but this is not work . route map on ASR didn't match tag .

Here is configuration :

access-list 30 permit 172.16.0.0 0.0.255.255

!

route-map bgp-to-eigrp permit 10
match ip address 30
set metric 10000 50 254 1 1500

!

route-map eigrp-to-bgp permit 10
match tag 2000

!

route-map eigrp-to-bgp deny 20
match ip address 30
!
route-map eigrp-to-bgp permit 50

[Georg Pauwen]

Hello,

post the full configs of all three routers so we can lab this...

[paul driver]

Hello

Just like to add you dont really need to set the tags on the redistributed bgp routes, by default the asn they originated from will be the tagged value in the eigrp topology database,  So try matching on the asn tag instead?

sh ip eigrp topology | in tag

[fan.gao@academy.com]

yeah , I tried with tag 2000 before , but same problem , I even tried with different model of router , but no help .

so basically is match tag seems not work in route map when I redistribute it from EIGRP to BGP .

[paul driver]

Hello

---

fan.gao@academy.com wrote:

so basically is match tag seems not work in route map when I redistribute it from EIGRP to BGP .

---

When you redistribute igp into bgp then the asn tag is lost correct?  Try the following but you may find the origin of the route is incomplete , please verify if that is the case.

route-map eigrp-into-bgp
set as-path tag

router bgp xxx
redistribute eigrp xx match external route-map eigrp-into-bgp

[fan.gao@academy.com]

I can't change to redistribution part as it is production network here . any other thoughts ?