[c-nsp] xconnect with vlan rewrite between ME3600 and ASR9K

[Peter Persson]

Hey,

This is a known issue.
Paste from Cisco TAC

https://tools.cisco.com/bugsearch/bug/CSCug42508/?reffering_site=dumpcr

As per the description on the above DDTS, the following scenarios are
unsupported:

1. When we have EVC XConnect/SVI Based XConnect/RPW
- It won’t work when core is SVI Trunk.

2. When we have Port-Based XConnect on the other side
- It won’t work when core EVC and BD Tag don't match.
- It won’t work when core is SVI Trunk.

The workaround to this issue is to:

1. To use EVC in the core side instead of switchport trunk or
2. To use mpls over physical routed port instead of svi.

/Peter


2014-06-13 11:04 GMT+02:00 Ulrik Ivers <ulrik.ivers at excanto.se>:

> Hi all,
>
> I'm having a problem getting traffic across an xconnect between a ME3600
> and a ASR9K. Hoping someone can shed some light on what I'm missing. My gut
> feeling is that it has to do with the VLAN tag handling.
>
> Setup:
> CPE1 --- ME3600 -- MPLS -- ASR9K -- CPE2
>
> Traffic is coming in tagged with VLAN tag 2014 from CPE1 and untagged from
> CPE2.
>
> If I set it up with a vlan interface in ME3600 and running the xconnect on
> that interface things work.
> However, we would like to have the xconnect directly on the service
> instance if possible, to avoid mac learning on the ME3600. And that I can't
> get to work. I've tried both POP:ing vlan tag 2014 on the ME3600 as well as
> PUSH:ing in ASR, but no luck.
>
> The xconnect comes up OK, but no traffic between CPE1 and CPE2.
>
> -- Working config ---
> !! ME3600 !!
> interface GigabitEthernet0/1
> service instance 2014 ethernet
>   encapsulation dot1q 2014
>   rewrite ingress tag pop 1 symmetric
>   bridge-domain 2014
>
> interface Vlan2014
> xconnect 1.1.1.51 2014 encapsulation mpls
>
> !! ASR !!
> interface GigabitEthernet0/0/1/18.1 l2transport
> encapsulation untagged
> mtu 1514
>
> l2vpn
> xconnect group GROUP1
>   p2p CUST1
>    interface GigabitEthernet0/0/1/18.1
>    neighbor ipv4 1.1.1.12 pw-id 2014
> -----------------
>
> --- Tested config that does NOT work ---
> !! ME3600 !!
> int gi 0/1
> service instance 2014 ethernet
>   encapsulation dot1q 2014
>   xconnect 1.1.1.51 2014 encapsulation mpls
>
> !! ASR !!
> interface GigabitEthernet0/0/1/18.1 l2transport
> encapsulation untagged
> rewrite ingress tag push dot1q 2014 symmetric
> mtu 1510
>
> l2vpn
> xconnect group GROUP1
>   p2p CUST1
>    interface GigabitEthernet0/0/1/18.1
>    neighbor ipv4 1.1.1.12 pw-id 2014
> ------------
>
> Regards,
> /Ulrik Ivers
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