[c-nsp] IRB and channel-group help needed

[Brett Frankenberger]

On Thu, Jan 07, 2010 at 02:29:57PM -0500, Michael Ulitskiy wrote:
> I have it working exactly this way. my IOS is 12.1(26)E7
> the only special thing I remember about it is that if you want to spread port-channels across the
> different cards then those cards must be the same (or compatible). For example you can't have port-channel
> over ports on GE card and Enhanced GE card or between card with ACL daughter card and without it.
> 
> Michael
> 
> On Thursday 07 January 2010 12:12:11 pm Steven Pfister wrote:
> > I've got a 8540 switch running 12.1(20)E set up with IRB and I've
> > got two interfaces I'm looking at:
> > 
> > interface GigabitEthernet0/0/3
> >  no ip address
> >  no ip redirects
> > !
> > interface GigabitEthernet0/0/3.1
> >  description Native VLAN
> >  encapsulation dot1Q 1 native
> >  no ip redirects
> > !
> > interface GigabitEthernet0/0/3.99
> >  encapsulation dot1Q 99
> >  no ip redirects
> >  no cdp enable
> >  bridge-group 99
> > 
> > The other interface is Gigabit0/0/4 and is set up the exact same
> > way. I'd like to be able to set up a channel group for those two
> > interfaces. I set up the port channel like:
> > 
> > interface Port-channel1
> >  no ip address
> >  hold-queue 300 in
> > !
> > interface Port-channel1.1
> >  encapsulation dot1Q 1 native
> >  no ip redirects
> > !
> > interface Port-channel1.99
> >  encapsulation dot1Q 99
> >  no ip redirects
> >  bridge-group 99
> > 
> > But if I apply it to one of the interfaces, I get an error: "Error: Interface has sub-interface configured". I can take the subinterfaces off temporarily and set up the channel-group, but it I try and re-add the subinterfaces, I can't do that. Is this something that is possible? If so, what am I missing?

I'm not completely clear on what is being attempted here, but if the
goal is just to have a portchannel with 802.1q subinterfaces, you don't
configure the subinterfaces on the physical interface, just the
port-channel.  So in the config, the following interfaces should exist:
   Gi0/0/3
   Gi0/0/4
   Po1
   Po1.1
   Po1.99

     -- Brett