08-08-2013 09:27 PM - edited 03-07-2019 02:50 PM
in 3750. I would like to know what is the difference between channel-group id mode on and channel-group id mode desirable?
If I want to direct connect etherchannel port to HP server. I need to use mode on or desirable?
interface GigabitEthernet1/0/1
channel-group 1 mode on
or
interface GigabitEthernet1/0/1
channel-group 1 mode desirable
Thank you for help?
Solved! Go to Solution.
08-08-2013 10:07 PM
Ok, that looks more familiar. My recommendation is to use active. Desirable will not work, as it enables PAgP which HP will not understand. You may also use passive if the HP side will initiate.
Kind Regards,
Kevin
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08-08-2013 09:52 PM
Channel-group mode on will not negotiate with the device on the other side of the etherchannel. Channel-group mode desirable negotiates the etherchannel protocol with the distant end and if an agreement is made the channel is built.
For ether channel to HP, you will use LACP as PAGP is Cisco proprietary. My recommendation is to use desirable because if you use on then it would be very easy for you to create a loop that STP would ignore because you've created a static ether channel. If memory serves, you should have more options then just on and desirable. There should be LACP options such as active. Perhaps they're not supported in your code. What do you see when you question mark after "channel-group 1 mode"?
Kind Regards,
Kevin
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08-08-2013 10:05 PM
Hi Kevin
I saw below option. So, "active" or desirable" is the best if I direct connect to HP server? Please advise. thank you
Switch(config-if)#channel-group 5 mode ?
active Enable LACP unconditionally
auto Enable PAgP only if a PAgP device is detected
desirable Enable PAgP unconditionally
on Enable Etherchannel only
passive Enable LACP only if a LACP device is detected
08-08-2013 10:07 PM
Ok, that looks more familiar. My recommendation is to use active. Desirable will not work, as it enables PAgP which HP will not understand. You may also use passive if the HP side will initiate.
Kind Regards,
Kevin
**Please remember to rate helpful posts as well as mark the question as 'answered' once your issue is resolved. This will help others to find your solution faster.
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