[c-nsp] ME3600/A9K MVPN PIM VRF neighbour issues

[Jason Lixfeld]

I’m trying to turn up MVPN between a 9K and an ME3600.

- My default MDT seems OK; tunnel0 and mdt tunnels are up on the ME3600 and A9K, respectively.
- Each box sees the correct PIM interfaces in the VRF, but only the 9K sees the ME3600 as a PIM neighbour over the tunnel, the ME3600 doesn’t see a PIM adjacency over the tunnel.
- The ME3600 (me3600-1) with the MVPN config is an MP-BGP neighbour of the A9K (a9k-1), but there are two other ME3600s in the middle that are not a part of the MVPN.  That said, each ME3600 is a PIM neighbor of the other in the global table, all the way along to the 9K.  That should be all I need.  Everything else should happen over BGP and the non-MVPN ME3600s should be agnostic to any of that.
- The BGP adjacency in the MDT SAFI between me3600-1 and a9k-1 is up, but what I think might be contributing to this is that the A9K sees a prefix in the MDT SAFI from me3600-1, but me3600-1 doesn’t see a prefix from the A9K over the MDT SAFI; there doesn’t seem to be a locally originated prefix on the A9K.  On the ME3600, that locally sourced prefix is actually the loopback in the global table is the update-source and remote peering IP for the MP-BGP infrastructure.  This seems fine to me, because this link:

http://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r4-2/multicast/configuration/guide/b_mcast_cg42crs/b_mcast_cg42crs_chapter_00.html#task_2665897

Suggests that the default behaviour in XR is the same as what I’m seeing on the me3600-1, which is why the global loopback shows up as an BGP-MDT learned prefix.

It’s probably something dumb, but I’m having a hard time finding any troubleshooting docs that relate to A9K/IOS intermix for this sort of topology.

I’ve already got LSM working across my A9K backbone; I just hope it’s not some odd interop thing that makes LSM and MVPN interoperability in the same VRF a problem there.

Can anyone see something I may have missed?

Topo:

ME3600 1 (MVPN) —— ME3600 2 (PIM) —— ME3600 3 (PIM) —— A9K 1 (MVPN)

me3600-1#show ip pim neigh
PIM Neighbor Table
Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
      P - Proxy Capable, S - State Refresh Capable, G - GenID Capable
Neighbor          Interface                Uptime/Expires    Ver   DR
Address                                                            Prio/Mode
72.15.51.236      TenGigabitEthernet0/1    01:09:45/00:01:27 v2    1 / S P G
me3600-1#sh ip pim vrf tv neighbor
PIM Neighbor Table
Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
      P - Proxy Capable, S - State Refresh Capable, G - GenID Capable
Neighbor          Interface                Uptime/Expires    Ver   DR
Address  




                                                          Prio/Mode
me3600-2sh ip pim neigh
PIM Neighbor Table
Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
      P - Proxy Capable, S - State Refresh Capable, G - GenID Capable
Neighbor          Interface                Uptime/Expires    Ver   DR
Address                                                            Prio/Mode
72.15.51.6        TenGigabitEthernet0/1    00:55:06/00:01:41 v2    1 / S P G
72.15.51.237      TenGigabitEthernet0/2    01:11:45/00:01:20 v2    1 / DR S P G





me3600-3#show ip pim neigh
PIM Neighbor Table
Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
      P - Proxy Capable, S - State Refresh Capable, G - GenID Capable
Neighbor          Interface                Uptime/Expires    Ver   DR
Address                                                            Prio/Mode
72.15.51.2        TenGigabitEthernet0/1    00:55:26/00:01:39 v2    100/ DR P G
72.15.51.7        TenGigabitEthernet0/2    00:55:26/00:01:23 v2    1 / DR S P G





a9k-1#show pim neighbor te0/2/0/2
Fri Nov 28 16:23:16.113 EST

PIM neighbors in VRF default
Flag: B - Bidir capable, P - Proxy capable, DR - Designated Router,
      E - ECMP Redirect capable
      * indicates the neighbor created for this router

Neighbor Address             Interface              Uptime    Expires  DR pri   Flags

72.15.51.2*                  TenGigE0/2/0/2         2d01h     00:01:29 100 (DR) B P E
72.15.51.3                   TenGigE0/2/0/2         00:56:08  00:01:42 1      P
a9k-1#show pim vrf tv neighbor | i mdt
Fri Nov 28 16:24:54.797 EST
72.15.48.4*                  Lmdttv                 46w1d     00:01:40 1 (DR) P E
72.15.48.4*                  mdttv                  2d02h     00:01:25 1      P E
72.15.50.152                 mdttv                  00:57:36  00:01:40 1 (DR) P
a9k-1#show pim vrf tv interface
Fri Nov 28 16:27:37.663 EST

PIM interfaces in VRF tv
Address               Interface                     PIM  Nbr   Hello  DR    DR
                                                         Count Intvl  Prior

72.15.48.4            mdttv                         on   2     30     1     72.15.50.152
72.15.48.4            Lmdttv                        on   1     30     1     this system
172.16.0.32           Loopback2022                  on   1     30     1     this system