Outbound route-filtering from the PE towards the core...
Our configurations require an outbound route-map from the PE to the route reflector to set some attributes (such as local preference or community). In the route-map configuration we have:
route-map send-to-rr permit 10
match ip address prefix-list hilocalprefnets
set local-preference 200
route-map send-to-rr permit 20
match ip address prefix-list lolocalprefnets
set local-preference 100
router bgp 1234
neighbor x.x.x.x route-map send-to-rr out
The prefix-lists above have permit statements that match on normal IPV4 addresses. Our question is how does the PE know that the matched IPV4 addresses come from a specific VRF as it only has a VPNV4 session with the RR and not one per VRF? For example, if you had conflicting IPV4 addressing in separate VRF's, would that same local-preference be set for all IPV4 prefixes in that outbound route-map under the VPNV4 address-family?
One solution that i've been considering is the use of extended community lists and matching both the extcommunity list and prefix under the route-map. I'm curious if there are any alternate approaches to this problem?
This document is an early notification of a behaviour change that will be introduced in IOS XR release 6.5.
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