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Catalyst 4500 Series,  Catalyst 2948G, Catalyst 2948G-GE-TX,  and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
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Chapter6      Configuring Fast EtherChannel and Gigabit EtherChannel
Configuring EtherChannel Using LACP
Disabling an EtherChannel
To disable an EtherChannel, perform this task for ports 2/2 to 2/8:
This example shows how to disable an EtherChannel:
Console> (enable) set port lacp-channel 2/2-8 mode off
Port(s) 2/2-8 channel mode set to off.
Console> (enable)
Displaying Spanning Tree-Related Information for EtherChannels
You can display the channel ID and the truncated port list for all ports that are channeling. Ports that are 
not channeling are identified by their port number.
To display spanning tree-related information for EtherChannels, perform this task:
These examples show how to display spanning tree-related information for EtherChannels:
Console> show spantree 4/6
Port                     Vlan Port-State    Cost  Priority Portfast   Channel_id
------------------------ ---- ------------- ----- -------- ---------- ----------
 4/6                     1    not-connected     4       32 disabled   0         
Console>
Console> show spantree 4/7-8
Port                     Vlan Port-State    Cost  Priority Portfast   Channel_id
------------------------ ---- ------------- ----- -------- ---------- ----------
4/7-8                    1    blocking          3       32 disabled   770       
Console>
Task Command
Disable an EtherChannel. set port lacp-channel mod/port mode off
Task Command
Display spanning-tree related information for 
EtherChannels.
show spantree mod/port