From: Mike Stout (michaelgstout@gmail.com)
Date: Mon Dec 31 2007 - 15:01:11 ARST
ibgp likes communities.
eigrp likes tags
set a community on bgp speekers using a route-map
set a tag on eigrp speakers using a route-map
set send-community both on ibgp speekers
set send-community both on route-reflectors.
I think you route-reflector is not sending the information.
On 12/28/07, Broad, Adam(Aberdeen Appointments Agency) <
Adam.Broad@contractor.conocophillips.com> wrote:
>
> Hi,
>
> We have a strange issue with route tagging, just wondering if anyone had
> come across it before.
>
> We have an EIGRP Network with five devices in it. Two of the devices do
> BGP and run iBGP between them (call them router1 and router2). (They
> also have eBGP connections out to the WAN.)
> Routes come in through BGP and get redistributed into EIGRP with a route
> map to set a tag of 179.
> There is mutual redistribution of EIGRP back into BGP on both but with a
> route map to block any networks tagged with 179.
>
> The issue is that the tag is only seen on the router doing the
> redistribution and on one other device (router3)
> Router 2 , Router 4 and router 5 see all the routes in EIGRP but with no
> tag.
>
> If I add a static route with a tag on Router 4 and redistribute it into
> EIGRP - all the routers see the tag on this route.
> I have cleared the EIGRP neighbour relationship between Router 4 and
> Router1 and still cannot see the tags.
> As far as I know, a tag is a tag and all routers/layer 3 switches should
> see it? There are a number of ways to get round the issue but it would
> be nice to know why its happening. I don't think it can be a bug can it?
> - unless its something strange with the code of the 3560 switches?
>
> For info
> Router 1 is a WS-C3560-24PS running 12.2(40)SE
> Router 2 is a 3725 running 12.2(11)T6
> Router 3 is a WS-C3560-24PS running 12.2(40)SE
> Router 4 and 5 are 6509 switches running IOS version 12.2(17d)SXB11a
>
> Routers 1, 2 and 3 are in the same vlan.
> Routers 1, 3, 4 and 5 are all connected to each other.
>
> Some output-
> Router1#sh ip eigrp top 155.191.200.0/26
> EIGRP-IPv4 (AS 66): Topology Default-IP-Routing-Table(0) entry for
> 155.191.200.0/26
> State is Passive, Query origin flag is 1, 1 Successor(s), FD is 630016
> Routing Descriptor Blocks:
> 154.46.215.49, from Redistributed, Send flag is 0x0
> Composite metric is (630016/0), Route is External
> Vector metric:
> Minimum bandwidth is 4096 Kbit
> Total delay is 200 microseconds
> Reliability is 255/255
> Load is 1/255
> Minimum MTU is 4470
> Hop count is 0
> External data:
> Originating router is 154.46.127.48 (this system)
> AS number of route is 64615
> External protocol is BGP, external metric is 19712
> Administrator tag is 179 (0x000000B3)
>
> Router2#sh ip eigrp top 155.191.200.0/26
> IP-EIGRP (AS 66): Topology entry for 155.191.200.0/26
> State is Passive, Query origin flag is 1, 1 Successor(s), FD is 632576
> Routing Descriptor Blocks:
> 154.46.136.43 (FastEthernet0/0), from 154.46.136.43, Send flag is 0x0
> Composite metric is (632576/630016), Route is External
> Vector metric:
> Minimum bandwidth is 4096 Kbit
> Total delay is 300 microseconds
> Reliability is 255/255
> Load is 1/255
> Minimum MTU is 1500
> Hop count is 1
> External data:
> Originating router is 154.46.127.48
> AS number of route is 64615
> External protocol is BGP, external metric is 19712
> Administrator tag is 0 (0x00000000)
>
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