[c-nsp] ASR920 LACP and xconnect

Eric Van Tol eric at atlantech.net
Fri Aug 21 14:30:46 EDT 2020

Problem is essentially resolved. I got one direct response telling me to try configuring a pseudowire interface and using l2vpn context, then add the Po1 and PW interfaces as members. While I believe that would have worked, I discovered the customer wasn't even using their untagged VLAN2 for anything, so I pulled that VLAN out of the EFP and rebuilt it:

interface Port-channel1
 mtu 1600
 no ip address
 load-interval 30
 negotiation auto
 no keepalive
 service instance 1 ethernet
  encapsulation dot1q 1,3-4094
  xconnect x.x.x.x 1234 encapsulation mpls pw-class Raw-Mode-VC5
   mtu 1600
 service instance 2 ethernet
  encapsulation untagged
  l2protocol peer lacp

This seems to have stopped the removal and re-insertion of the member ports from/into the LAG. I had assumed the customer was using this untagged VLAN, as it was specifically configured on their trunk port as one of two allowed VLANs. Thanks to all.


On 8/21/20, 1:55 PM, "cisco-nsp on behalf of Gert Doering" <cisco-nsp-bounces at puck.nether.net on behalf of gert at greenie.muc.de> wrote:


    On Fri, Aug 21, 2020 at 08:34:14AM +0300, hank at interall.co.il wrote:
    > We have seen that as well.  We had that recently with a new  
    > international carrier.
    > Turns out when they set up the circuit on their optical switching  
    > equipment (whether it be Ciena, ECI, Infinera, Cisco or whoever),  
    > there are some knobs that need to be adjusted to allow through all  
    > types of packets.  After having our NOC staff eat 4 hours in the wee  
    > hours of the morning trying to debug why the LACP bundle would not  
    > come up, a simple change by the carrier the next day had the new  
    > circuits up in a matter of seconds.

    LACP bundles *through* two ASR920s actually work nicely.  

    Just LACP *to* an ASR920, and then forwarding said bundle via EoMPLS
    (not individual VLANs, but "all of the poX interface") fails.

    "If was one thing all people took for granted, was conviction that if you 
     feed honest figures into a computer, honest figures come out. Never doubted 
     it myself till I met a computer with a sense of humor."
                                 Robert A. Heinlein, The Moon is a Harsh Mistress

    Gert Doering - Munich, Germany                             gert at greenie.muc.de

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