Cisco and Juniper – BGP MPLS L2VPN VPLS interoperability

Sweet! This guy had the answer I was looking for…

…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

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…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:

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 1500

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Cisco, Netwerk (C-NSP)