[c-nsp] ASR9K to ASR920 MPLS issue

[Emille Blanc]

We have had problems with MPLS VC's on ASR's in the past, if the MTU on both sides don't match.
Though the behavior is erratic - sometimes the VC comes up and won't pass traffic, sometimes it doesn't come up at all.

We've also never tried an xconnect on an ASR physical interface. Though I don't have any reason to suspect it wouldn't work, try an untagged service instance?

Do all three VC segments show up/up on the 920?
(sh xconnect int Ten0/0/25)

-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Jerry Bacon
Sent: Tuesday, January 05, 2021 10:45 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] ASR9K to ASR920 MPLS issue

I have added an ASR920 to my network and cannot get an MPLS VC to work 
between it and my ASR9K. The VC comes up on both sides, but no traffic 
passes through the circuit. Both the ASR9K and the ASR920 have MPLS VCs 
working with other devices.

ASR9K:

Cisco IOS XR Software, Version 6.6.2[Default]

interface TenGigE0/0/1/0.95 l2transport
  encapsulation dot1q 95
  mtu 9114

l2vpn
  xconnect group mpls1
   p2p test1
    interface TenGigE0/0/1/0.95
    neighbor ipv4 10.100.66.1 pw-id 95

ASR920:

Cisco IOS XE Software, Version 03.18.05.SP.156-2.SP5-ext

interface TenGigabitEthernet0/0/25
  mtu 9100
  no ip address
  cdp enable
  service instance 95 ethernet
   encapsulation dot1q 95

l2vpn xconnect context test1
  member TenGigabitEthernet0/0/25 service-instance 95
  member 10.100.25.11 95 encapsulation mpls

Local interface: Te0/0/25 up, line protocol up, Eth VLAN 95 up
   Interworking type is Ethernet
   Destination address: 10.100.25.11, VC ID: 95, VC status: up

   VC statistics:
     transit packet totals: receive 43471, send 0

I have tried both with and without a rewrite on each side, with no 
difference.

Ideas, thoughts, suggestions are welcome.

Thanks.

-- 

Jerry Bacon
Senior Network Engineer
StarTouch, Inc.
http://www.startouch.com
360-543-5679 ext. 111
Microwave - Fiber Optics - Internet Services

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