[rbridge] TTL only - was RE: New fields in shim header?

[Silvano Gai]

Caitlin,

....
 
> 
> For the same reason Bernard Aboba cited on wireless. An set of
> RBridges can distribute the new location information more
> efficiently than existing bridges. 

When a VM move the first thing it does is an ARP, i.e. it sends a
broadcast packet.

In IEEE 802.1D this broadcast propagates on the VLAN and updates the
filtering databases (the new location is learnt).

In TRILL this broadcast propagate on the VLAN, but the new location is
not learnt inside the TRILL cloud, it is only learnt on the ingress
port. The learning in ingress causes the new location to be distributed
through ISIS. Each RBridge needs to compute a new forwarding table and
to download it to HW.

I doubt that in this aspect TRILL is more efficient that .1D, or am I
missing something?

-- Silvano