I am really having a very strange case , XR2 is a vpnv4 route refelctor . In the same time it is having a vrf FOO with a loop back configured in it . XR2 is having a multihop ebgp session with R4 . Problem is XR2 is sending the the Lo1 route to its iBGP peers but not to its EBGP peer !!! . And below is the logs I am getting
RP/0/0/CPU0::Nov 11 14:27:39.736 : bgp: [upd] (vpn4u): No unreachable (not advertising imported path to non-CE neighbor) sent to sub-group 0.2 with v4Addr:10.0.0.20:1:172.16.0.19/32
i guess you are doing Inter-AS Option C.. It may seem you are having some issues with label binding. double-check all your LDP neighbors and prefixes you need to redistribute in your IGB or to advertise by BGP+Label up to the PE.
This document is an early notification of a behaviour change that will be introduced in IOS XR release 6.5.
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