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You are here: Home / Juniper / MPLS BGP VPN’s not supported accross un-numbered interfaces

MPLS BGP VPN’s not supported accross un-numbered interfaces

April 24, 2016 by david

MPLS BGP VPN’s not supported across un-numbered interfaces.

When using an un-numbered interface between PE and P routers instead of IP numbered interfaces, the ERX no longer displays VPN routes and shows the next hop address and unreachable even though ICMP Pings to the next hop address are successful.

Platform: Juniper E-Series

show ip bgp vpn vrf test 192.168.2.0
BGP route information for prefix 192.168.2.0/24
  Received route learned from internal peer 172.81.254.202
    Route not placed in IP forwarding table
    Do not advertise to any peers
    Address Family Identifier (AFI) is ip-v4
    Subsequent Address Family Identifier (SAFI) is unicast
    Route Distinguisher (RD) is 19262:23101
    Original Route Distinguisher (RD) is 19262:23010
    MPLS in-label is none
    MPLS out-label is 20
    Next hop IP address is 172.81.254.202 (not reachable)
    Multi-exit discriminator is 0
    Local preference is 100
    Weight is 0
    Origin is Incomplete
    AS path is empty
    Extended communities RT:19262:23010

SOLUTION:
MPLS BGP VPN’s are not supported on un-numbered interfaces. Assigning an IP address to the interface will allow MPLS Tunnels to be built, and display VPN routes correctly.

Related

Filed Under: Juniper Tagged With: BGP, Juniper E-series, MPLS, VRF

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