[c-nsp] 7600 SVI and subinterface combination

[Peter Rathlev]

Hi Alex,

On Tue, 2008-04-08 at 16:48 +0400, Alex A. Pavlenko wrote:
> Colleagues,
> 
> is it possible to combine both SVI(for ip routing) and subinterface(for
> EoMPLS) upon common 
> interface configured as a trunk on 67xx LAN card?
> In other words is following configuration ok?
> 
> interface GigabitEthernet1/1
>  switchport
>  switchport trunk encapsulation dot1q
>  switchport mode trunk
>  switchport trunk allowed vlan 10,20
> 
> interface GigabitEthernet1/1.20
>  encapsulation dot1Q 20
>  xconnect 1.2.3.4 1 encapsulation mpls
> 
> interface Vlan 10
>  ip address 4.3.2.1 255.0.0.0

Technically you shouldn't include VLAN 20 in your "switchport trunk
allowed vlan" list. Using LAN cards and PFC MPLS it's probably no harm,
since the VLAN will be reserved for the subinterfaced and hence cannot
be switched locally.

The 12.2SR configuration guide says:

"Avoid overlapping VLAN assigments between main and subinterfaces. VLAN
assigments between the main interface and subinterfaces must be mutually
exclusive."

-Cisco 7600 Series Cisco IOS Software Configuration Guide, 12.2SR
-Configuring Multiprotocol Label Switching on the PFC
http://www.cisco.com/en/US/docs/routers/7600/ios/12.2SR/configuration/guide/pfc3mpls.html#wp1406020
http://tinyurl.com/5lhusr

Regards,
Peter