[c-nsp] 7600/6500 L3 vs SVI

[Dale W. Carder]

Thus spake Jon Lewis (jlewis at lewis.org) on Fri, Aug 05, 2005 at 12:15:53PM -0400:
> 
> Where I'm confused though, is if I define an SVI (say vlan 2000), and 
> connect another switch to it (say a 3550), the 3550 sees that its on vlan 
> 2000.  If I configure the port as a layer 3 port, the 6500 still assigns a 
> vlan number to it (perhaps vlan 4000), but the 3550 sees the connection as 
> vlan 1.
> 
> What config option am I overlooking that lets me configure the SVI as 
> interface vlan2000, yet have connected switches think it's vlan 1?  I 
> assume this is possible since it's what the 6500 does automatically when I 
> configure the port as a layer 3 port.

Maybe you don't need to trunk to your 3550?

vlan 2000
 name Foo-lan

int vlan 2000
 ip addr 10.0.0.1

interface gi1/49
 no ip addr
 switchport
 switchport mode access
 switchport access vlan 2000

If you do need to trunk to your 3550, you could set vlan 2000 as the
"native vlan", or worst case, rewrite the tags on the trunk port.

However, I would note that it is a best practice not to use vlan 1.

Dale


----------------------------------
Dale W. Carder - Network Engineer   
University of Wisconsin at Madison  
http://net.doit.wisc.edu/~dwcarder