Solved: etherchannel problems between 6509 and 3750 stack

robj · ‎12-21-2008

6509 is running IOS ver 72033.advipservcesk9_wan_mz.122-33.SXH2a

3750 stack consists of one 3750g-24ts and one 3750-24p running ipbasek9-122.46(SE).

When each end configured for "channel-group n mode on" the 3750 ports go into err-disable. With each end configured for "channel-group n mode desirable" 3750 will fail because PAgP does not work across stack, etherchannel ports need to be on same switch.

Has anyone else seen this problem and what action was taken to overcome this problem?

MUHAMMAD SHAHEEN · ‎12-22-2008

Hi Rob,

Follow this link to setup the Ether-Channels

http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_example09186a00806cb982.shtml

Hope This helps

Shaheen

View solution in original post

passioncas · ‎12-21-2008

Configure the etherchannel with the commands ( channel-group n mode )instaed of desirable.Pleaseet me know how its working once it is done.

MUHAMMAD SHAHEEN · ‎12-22-2008

Hi Rob,

Follow this link to setup the Ether-Channels

http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_example09186a00806cb982.shtml

Hope This helps

Shaheen

archari · ‎12-22-2008

When it does happen can you collect o/p of

show errdisable recovery

show errdisable flap-values

glen.grant · ‎12-22-2008

I also recommend using LACP to set up the etherchannels. "channel-group 1 mode active" on both ends . There should be no problems once you do this , we have this same setup going all over.

robj · ‎12-22-2008

Setting the "channel-group n mode on" command works providing you set the channel-group on the 3750 stack first, then the 6500 core node. Otherwise for some reason the switch ports go into "err-disable" and the ports have to be shut/no shut and the port-channel definition deleted and then re-instated.