MPLS Collapsed PE-CE multihoming

Question

Hello Netpros,
Here's the sample scenario:
- plain MPLS network (MPBGP + OSPF) with VRF VPNs
- VRF XXX configured say on PE1,PE2,PE3
- PE1 and PE2 are colocated in the same site: there is a a transit vlan to communicate with a couple of firewalls, mapped to VRF XXX; no CEs, just HSRP/VRRP and static routic redistributed in MPBGP
How can I force PE3 (remote site) to choose PE1 as best path to reach the Firewalls, for the single VRF XXX ?
Hope it's clear, thanks a lot
Andrea

Answer 1

Hello Andrea,
you should be able to apply a route-map in the vpnv4 address-family where:
you check the IP BGP next-hop= PE1 loopback
and
you check route-target = that of VRF XXX
and you set local-preference to 200
access-list 11 permit host PE1-loop
ip
route-map rise-preference permit 10
match ip next-hop 11
match route-target extcommunity 12
set local-preference 200
! empty final block to accept all other
! vpnv4 routes unchanged
route-map rise-preference permit 20
router bgp XX
address-family vpnv4
neigh RRS route-map rise-preference in
this setup should work also with a RRS in the middle unless PE2 is preferred by RRS.
Use different RDs on PE1 and PE2 to be sure routes of both are propagated in the domain.
Hope to help
Giuseppe