From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Tue Dec 16 2003 - 20:40:52 GMT-3
Jim,
The spanning-tree process sees the port channel as one interface,
therefore there is only one instance of spanning tree for all member
interfaces. You can verify this with the "show spanning-tree" command:
SW1#show spanning-tree vlan 10
VLAN0010
Spanning tree enabled protocol ieee
Root ID Priority 32778
Address 000a.f4f3.e780
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32778 (priority 32768 sys-id-ext 10)
Address 000a.f4f3.e780
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 15
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Po1 Desg FWD 19 128.65 P2p
If the member interfaces are listed then the channel is not
correctly configured. Traffic will forward over all member interfaces, and
is load balanced based on the source MAC address of the frame. Load
balancing can be changed to destination MAC with the "port-channel
load-balance" command:
SW1(config)#port-channel load-balance ?
dst-mac Dst Mac Addr
src-mac Src Mac Addr
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 708-362-1418 (Outside the US and Canada)
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> CURTISJ@Nationwide.com
> Sent: Tuesday, December 16, 2003 4:53 PM
> To: ccielab@groupstudy.com
> Subject: Spanning-tree Channel-group question
>
> What is the best way to make sure all ports on a channel-group (3550) are
> in the spanning-tree forward state?
>
> Thanks Jim
>
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