[c-nsp] 7600/6500 L3 vs SVI

Jon Lewis jlewis at lewis.org
Fri Aug 5 12:15:53 EDT 2005

It's my understanding that on one of these swouters (I'm running 
Sup2/MSFC2/PFC2) a layer 3 interface is handled internally as an SVI. 
For flexibility, I think I'd prefer to actually configure all my layer 3 
interfaces as SVIs...since that makes it so much easier to transition them 
from one physical port to another, and AFAIK makes some more ACL features 

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.

  Jon Lewis                   |  I route
  Senior Network Engineer     |  therefore you are
  Atlantic Net                | 
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