[c-nsp] Q-in-Q bridging

victor vitya at list.ru
Mon Jul 6 08:46:35 EDT 2009


Hi
For the redundancy/failover sake I'm bridging 2 Q-in-Q interfaces. Here is  
config:

interface BVI1
  ip address 10.67.201.100 255.255.255.0

interface GigabitEthernet0/2.4012010
  encapsulation dot1Q 401 second-dot1q 2010
  no cdp enable
  bridge-group 1

interface GigabitEthernet0/3.4012010
  encapsulation dot1Q 401 second-dot1q 2010
  no cdp enable
  bridge-group 1

interface BVI1
  ip address  255.255.255.0

bridge 1 protocol ieees

Network looks like this:

Router==QinQ==(MAN Switches Ring)----LanSwitch---Host(10.67.201.5)

Router physically connected to 2 core switches and terminates dot.Q  
tunnels.
MAN switches carry vlan tunnels and the when the LAN enters into the MAN  
Ring it is assigned outer tag 401.
The Host is inside LAN on VLAN 2010 and connected through access port.
The ip 10.67.201.100 is going to be default GW for the LAN Host and must  
remain reachable even if one of the core switches goes down.
When I assign IP address to either G0/2.4012010 or G0/3.4012010 sub  
interfaces I'm able to ping it from the Host. But after bridging them I  
can't ping BVI1 from the Host. What am I doing wrong? Is it supposed to  
work this way?

Regards, Victor
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