[c-nsp] Cisco and Juniper - BGP MPLS L2VPN VPLS interoperability

[Aaron]

Sweet!  This guy had the answer I was looking for...
https://supportforums.cisco.com/discussion/11517026/inter-vpls

...an RFC4761 trick in IOS XR fixed the missing mtu on my ASR9k when trying
to setup LSP's to Juniper.

******** this is what fixed it*************
l2vpn
 autodiscovery bgp
  signaling-protocol bgp
   mtu mismatch ignore
***********************************

...now pw's are up (and I can ping from BVI on asr9k to ce's behind junipers

RP/0/RSP0/CPU0:eng-lab-9k-1#sh l2v br gr v100
Sat Dec  5 22:49:06.395 CST
Legend: pp = Partially Programmed.
Bridge group: v100, bridge-domain: v100, id: 11, state: up, ShgId: 0, MSTi:
0
  Aging: 300 s, MAC limit: 4000, Action: none, Notification: syslog
  Filter MAC addresses: 0
  ACs: 1 (1 up), VFIs: 1, PWs: 3 (3 up), PBBs: 0 (0 up)
  List of ACs:
    BV100, state: up, BVI MAC addresses: 1
  List of Access PWs:
  List of VFIs:
    VFI v100 (up)
      Neighbor 10.101.12.245 pw-id 10100, state: up, Static MAC addresses: 0
      Neighbor 10.101.12.248 pw-id 10100, state: up, Static MAC addresses: 0
      Neighbor 10.101.12.250 pw-id 10100, state: up, Static MAC addresses: 0


...pw's are up even though junipers don't seem to be sending the asr9k their
mtu size.

RP/0/RSP0/CPU0:eng-lab-9k-1#sh l2v br gr v100 de | in MTU
Sat Dec  5 22:49:12.265 CST
  Bridge MTU: 1500
      MTU 1514; XC ID 0x80000015; interworking none
          MTU          1500                           unknown
          MTU          1500                           unknown
          MTU          1500                           1500


Aaron