[c-nsp] ASR901 - L2 tunneling

[George Giannousopoulos]

Hi Psem,

We also did some tests with the ASR901 and we had issues with l2protocol
forwarding
After some research with cisco, we concluded that

- L2protocol tunnelling is not supported and there is no plan to support it
- L2protocol forwarding is supported on EFPs only for untagged PDUs
- L2protocol forwarding for tagged PDUs is only supported locally on BD
- L2protocol forwarding for both tagged and untagged PDUs is supported with
port-based EoMPLS

George


On Mon, Aug 26, 2013 at 3:24 AM, Pshem Kowalczyk <pshem.k at gmail.com> wrote:

> Hi,
>
> I'm trying to asses if we could use asr901 for our usual metro-E
> deployments (where we currently use ME3600x). L3 on the ASR901 seems
> to work well enough, but with L2 I've encountered some issues,
> especially around L2 tunneling.
> I've already managed to confirm with Cisco, that some of the
> functionality is not there yet, but determining what actually works
> proven to be more difficult. So I'm looking for any input regarding
> the subject.
>
> I've tried to set up a simple dot1q to dot1q (both ends ASR901) xconnect:
>
> interface GigabitEthernet0/4
>  description tester (slave)
>  no ip address
>  negotiation auto
>  l2proto-forward tagged
>  service-policy output PM-CUST-DEFAULT-10M-OUT
>  service instance 1 ethernet
>   encapsulation dot1q 17
>   xconnect 10.122.129.254 4545 encapsulation mpls
>    mtu 9000
>
> (and identical setup on the other device)
> The xconnect comes up fine and forwards standard ethernet frames no
> issues. I can't get any of the L2 (STP, LLDP) stuff to work though.
> The frames simply don't leave the box (I don't think there is a way to
> do port-mirror on ASR901, so I have to capture the frames on the next
> device).
>
> I've got confirmation from Cisco that this wouldn't work with
> encapsulation 'default', but I hoped to get it going with explicit
> tag, especially with the ' l2proto-forward tagged' command. But
> documentation is scarce.
> Has anyone managed to configure this and get it working?
>
> kind regards
> Pshem
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