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

[David Wilkinson]

Wouldn't that only affect large packets and not all packets?
The port MTU on the ASR is 9206 and 9198 on the 4948s


On 14/07/2016 12:15, Curtis Piehler wrote:
>
> 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 <mailto: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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