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From: pfisterfarm on 7 Jan 2010 12:13
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?
From: bod43 on 7 Jan 2010 15:32
On 7 Jan, 17:13, pfisterfarm <pfisterf...(a)gmail.com> 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 would have thought that you configured the sub-interfaces on the
port channel only. Not the physical interfaces.

By the way as I am sure you
know there are two very distinct 8500 models, one
very ATM-y and one Ethernet-y and you need to be
careful which documentation you look at. CSR? Was
decades ago:)

Have a look at this.

http://www.cisco.com/en/US/products/hw/switches/ps628/products_configuration_example09186a00800ef797.shtml
"Configuring EtherChannel and 802.1Q Trunking Between
Catalyst L2 Fixed Configuration Switches and a
Router (InterVLAN Routing)"

Hope it might help.

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