02-29-2012 07:37 AM
Hi,
I'm struggling with a small problem.
let say we have 3 routers - R1,R2 and RR.
we have 2 VRF:
CustA - RD100:1
MGMT - RD:100:100
RR is a router reflector
the topology looks like:
I'm trying to export a cirtain routes from CustA to MGMT with help of following route-maps on router RR
ip access-list standard MGMT
permit 192.168.100.0 0.0.0.255
!
route-map MGMT permit 10
match ip address MGMT
set extcommunity rt 100:999 additive
for the test purpose a loopback interface was configured on R1 in CustA VRF with IP from 192.168.100.0/24 subnetz.
All routing information are correctly distributed over all routers, but export doesn't work - the IP from 192.168.100.0/24 doesn't get the additionla RT 100:999.
If I configure the "export-map" in VRF configuration on R1 then the export works perfectly - 192.168.100.0/24 gets additional RT 100:999 and it's then imported by the router RR in VRF MGMT.
But, as far as I understand the export should work exactly in the same way if I do it only on RR router, shouldn't it ? I mean if take a real life network - we don't want to configure that export-map on all PE routers for all VRF, it should be enough if we do it centrally - on the router-reflectors.
What can be wrong with my configuration?
03-01-2012 03:08 AM
Hi again,
just to clear the things:
Is it true that "export-map" works only for prefixes which are inserted in the VRF localy on the router? I coudn't find any conformation or rejecting of this statement.
03-01-2012 03:32 AM
Hi Konstantin,
that is true, RRs do not actually export the routes, rather reflect them and hence this feature is not applicable on those(unless one has a VRF with the interfaces being advertised on a RR). I would go for a route-map under VPNv4 address-family to achieve what you need.
On a side note, this might be worth looking into -
http://www.cisco.com/en/US/docs/ios/iproute_bgp/configuration/guide/irg_rt_filter.pdf
Hope that will help,
Ivan.
03-01-2012 04:20 AM
Hi Ivan,
thank you for the update and links, I'll study them.
Do you mean the problem in my configuration could be the route-reflector topology? I'll try to test without RR but anyway it will be not useable in production network.
I've founf this simple topology example
http://rekrowten.wordpress.com/2011/12/12/route-leaking-between-vrfs-by-using-export-maps/
and it looks like the export is working fine in this example and exports the routes on the remote router, but that remote router does a redistribution from OSPF into BGP, may be this is the trick.
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