SPB packet routing question

[atascoman]

I was curious if anyone might know the answer to this. I am curious how the packet would travel in this scenario.

VSP A
VLAN 10 ISID 10100
VLAN 10 IP 10.10.100.1/24

VSP B
VLAN 10 ISID 10100

If you were to connect a device to VLAN 10 on VSP B, and a device behind VSP B tries to communicate with that device, does the traffic hairpin through Router A or is the traffic bridged locally?

 

[andy88]

if the 2nd device was connected to a port in vlan 10 on vspB then it would be switched locally on the switch as it's MAC would be in the local fwd table.

SPB still populates/uses the fwd table on the switch. It just has a next-hop of the isis-id of the endpoint switch rather than the next-hop port.