[c-nsp] Quick question regarding trunking and routing.

[Jeff Kell]

Drew Weaver wrote:
> We have a 3550 which connects to two 6500s.
> The 3550 has some L3 vlans on it, but we also need to trunk a few of the ports up to the 6500s.
> I've been banging my head because I cannot figure out how to make the two uplink ports on the 3550 both trunk and route.
> What I mean is, currently the ports have ip addresses assigned directly to them (/30s).

Take your /30 endpoints and make them SVIs on an unused vlan, and add
that vlan to the trunk allowed vlans.  If you slap 'ip address' on an
interface, it's going to be an L3 endpoint.  But keeping an SVI should
let you do what you want, provided that you properly "prune" the trunk
on both ends (switchport trunk allowed vlan ...) to avoid unintended
leakage over the trunk.

Jeff