[c-nsp] ASR9K to ASR920 MPLS issue

[Scott Miller]

I have multiple set up between a single ASR910 and various other ASR920's.
My config seems to work each time I turn up a new customer:

ASR920:
!
! Cisco IOS XE Software, Version 16.06.05a
!
l2 vfi xxxxxxx_Customer_VPLS manual
 vpn id 3938
 bridge-domain 3938
 mtu 9000
 neighbor xx.xx.xx.xx encapsulation mpls
!
! xx.xx.xx.xx = loopback of ASR9010
!
!
interface GigabitEthernet0/0/5
 description VPLS to Data Center
 mtu 9000
 no ip address
 no ip redirects
 no ip proxy-arp
 load-interval 30
 carrier-delay msec 0
 media-type auto-select
 negotiation auto
 service instance 3938 ethernet
  description VLAN 3938 - xxxxx_Customer (VPLS)
  encapsulation untagged
  service-policy input eox_550_mb_in_Police
  service-policy output eox_550_mb_out
  bridge-domain 3938
 !
!

ASR9010:
!
! Cisco IOS XR Software, Version 6.4.2
!
l2vpn
 bridge group xxxxxxx_Customer_VPLS
  bridge-domain xxxxxxx_Customer-VLAN-3938
   mtu 9000
   interface Bundle-Ether6.3938
   !
   neighbor yy.yy.yy.yy pw-id 3938
   !
! yy.yy.yy.yy = loopback of ASR920
!
interface Bundle-Ether6.3938 l2transport
 description COLO - xxxxxxx_Customer (VPLS)
 encapsulation dot1q 3938
 rewrite ingress tag pop 1 symmetric
!



On Tue, Jan 5, 2021 at 12:05 PM Emille Blanc <emille at abccommunications.com>
wrote:

> 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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