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?
> 
> 
> Steve Pfister
> Technical Coordinator, 
> The Office of Information Technology
> Dayton Public Schools
> 115 S. Ludlow St. 
> Dayton, OH 45402
>  
> Office (937) 542-3149
> Cell (937) 673-6779
> Direct Connect: 137*131747*8
> Email [email protected]
> 
> 
> _______________________________________________
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