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"
<[email protected] <mailto:[email protected]>> 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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