We haven't faced any issues with the following (ASR920 with 15.6(2)SP6):

interface Port-channel1
 service instance 100 ethernet
  encapsulation untagged
  l2protocol peer cdp lacp udld
 !
 service instance 501 ethernet
  encapsulation dot1q x
 !
 service instance 502 ethernet
  encapsulation dot1q y

--
Tassos

Eric Van Tol wrote on 20/8/20 21:12:
> Hi all,
> I’m trying to verify something here that is working, but also not working. At 
> some point, we built an LACP bundle to a customer device (2x1G ports) and put 
> it into an EoMPLS setup using xconnect to send it over to another site where 
> they have a 10G single circuit. While the LAG is ‘up’ and passing traffic, 
> the ports continuously get removed from the bundle and added back in and 
> there’s obviously a small amount of packet loss that occurs when that happens.
>
> ‘l2protocol peer lacp’ is configured on the Po1 service-instance and the 
> behavior is the same whether that command is there or not. My inclination is 
> to say that this should not work at all, but given that the bundle was 
> operational and not flapping when someone turned it up, it was considered to 
> be working.
>
> To confuse matters even more, customer switch on the other side is configured 
> with native VLAN 2, but I’m not entirely sure that matters if the overall 
> config isn’t even supported.
>
> Hardware: ASR920-12CZ-A
> Version: 03.16.04.S
>
> Interface configs:
>
> interface GigabitEthernet0/0/0
> mtu 1600
> no ip address
> load-interval 30
> negotiation auto
> channel-group 1 mode active
> !
>
> interface GigabitEthernet0/0/1
> mtu 1600
> no ip address
> load-interval 30
> negotiation auto
> channel-group 1 mode active
> !
> interface Port-channel1
> mtu 1600
> no ip address
> load-interval 30
> negotiation auto
> no keepalive
> service instance 1 ethernet
>   encapsulation default
>   l2protocol peer lacp
>   xconnect x.x.x.x 1234 encapsulation mpls pw-class Raw-Mode-VC5
>    mtu 1600
> !
>
> If this is confirmed as unsupported, would I be correct in that we would have 
> to separate out the untagged native VLAN into its own, non-xconnect EFP, so 
> as to do proper ‘l2protocol peer’ configuration? My only concern there is 
> that the native VLAN needs to be transported along with all other VLANs to 
> the other end of the xconnect so I am not sure right now how we do that, or 
> if we even can.
>
> -evt
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