[c-nsp] Cisco ASR 9k transporting QinQ traffic

[Curtis Piehler]

Make sure the port mtu is higher to allow for additional vlan tags.  4 byte
per vlan.
On Jul 14, 2016 7:11 AM, "David Wilkinson" <cisco-nsp at noroutetohost.net>
wrote:

> Hi,
>
> We are in the process of migrating some of our links over to Cisco ASR
> 9006, they are running IOS XR 5.3.3.
>
> Normal vlan tagged dot1q traffic seems be working fine, apart from some
> STP fun when pseudowire comes back up and STP doesn't know about the
> topology changing and both paths are forwarding for a short time. I don't
> think there is away around this as the ASR just passes on the STP traffic
> and doesn't take part STP.
>
> QinQ traffic doesn't seem to be going via ASR correctly and just
> disappears.
>
> It is currently setup like this, The customer port plugs in a Cisco 4948
> and the port is configured as a dot1q-tunnel. the port from the 4948 to ASR
> is configured as a trunk port and the same in reverse to the customer's
> other port.
>
> Customer -> Cisco 4948 -> Cisco ASR 9k -> Cisco 4948 -> Customer
>
> On the ASR I am picking up the QinQ vlan on sub interfaces, adding it to a
> bridge domain.
> Below is the configuration I am using
>
> ---- ASR ----
>
> interface GigabitEthernet0/0/0/17.427 l2transport
>  encapsulation dot1ad 427
>  l2protocol cpsv tunnel
>
> interface Bundle-Ether2.427 l2transport
>  encapsulation dot1ad 427
>  l2protocol cpsv tunnel
>
> l2vpn
>  bridge group cust-a
>   bridge-domain cust-a-qinq
>    interface Bundle-Ether2.427
>    !
>    interface GigabitEthernet0/0/0/17.427
>
> --- 4948 ---
>
> interface GigabitEthernet1/1
>  switchport access vlan 427
>  switchport mode dot1q-tunnel
>  l2protocol-tunnel cdp
>  l2protocol-tunnel stp
>  l2protocol-tunnel vtp
>
> interface GigabitEthernet1/48
>  switchport trunk encapsulation dot1q
>  switchport trunk allowed vlan 155,203,204,427,428
>  switchport mode trunk
>
>
> On the ASR if I change the encapsulation from dot1ad 427 to dot1q 427,
> then STP blocks with an inconsistent peer vlan message.
>
> %SPANTREE-2-RECV_PVID_ERR: Received BPDU with inconsistent peer vlan id 1
> on GigabitEthernet1/48 VLAN427.
> %SPANTREE-2-BLOCK_PVID_LOCAL: Blocking GigabitEthernet1/48 on VLAN0427.
> Inconsistent local vlan.
>
> Can any one point me in the right direction and let me know what I have
> done wrong, I am assuming it something on the ASR configuration as QinQs
> between the 4948s taking another path without the ASR in the middle work
> fine.
>
> Thanks
>
> David
>
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