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

[Jeff Fitzwater]

Use an SVI for the routing and the L2 port for the trunking.

! SVI
interface vlan 100
ip address 10.10.10.10 255.255.255.0


interface gi1/0/1
switchport
switchport mode trunk
! Use the following if you need to use a native vlan.
! switchport trunk native vlan nnnn
!Use the following to restrict what vlans you want on the trunk
!  swithcport trunk allowed vlans 100,200,300,400,500
switchport nonegotiate



Jeff
On Mar 13, 2009, at 8:34 AM, 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).
>
> I have to remove the IP to enable trunking, but then the L3 VLANs  
> that originate directly on the 3550 no longer function.
>
> I'm thinking there has to be some way to use uplink ports for both  
> trunking and routing but I just can't seem to figure it out.
>
> I realize that the "normal" network topology would be to just create  
> all the vlans on the 6500s and just trunk everything from the 3550  
> to the 6500s but for legacy purposes that isn't really an option.
>
> Any advice would be great.
>
> thanks,
> -Drew
>
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