From: Ben (ccieben@cox.net)
Date: Mon Aug 13 2007 - 11:02:44 ART
Hi Slevin,
With default settings, if you had two links between switches - one of
them would be blocked on one side. If you bond the links using
etherchannel, they are treated as one logical link - hence both are
forwarding.
Using NM-16ESW - SW1 & SW2 connected:
Fa2/1 <-->Fa2/1
Fa2/2 <-->Fa2/2
Before Etherchannel:
Rack1SW2#show spanning-tree vlan 10 brief | be Inter
Interface Designated
Name Port ID Prio Cost Sts Cost Bridge ID
Port ID
-------------------- ------- ---- ----- --- ----- --------------------
-------
FastEthernet2/1 128.82 128 19 FWD 0 32768 cc06.0c3c.0002
128.82
FastEthernet2/2 128.83 128 19 BLK 0 32768 cc06.0c3c.0002
128.83
After Etherchannel
Rack1SW2#show spanning-tree vlan 10 brief | be Inter
Interface Designated
Name Port ID Prio Cost Sts Cost Bridge ID
Port ID
-------------------- ------- ---- ----- --- ----- --------------------
-------
Port-channel1 129.65 128 12 FWD 0 32768 cc06.0c3c.0002
129.65
HTH
Ben
slevin kremera wrote:
> what relation or effect does etherchannel configuration have in relation to
> spanning tree forwarding state
>
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