05-15-2009 06:26 PM - edited 03-06-2019 05:45 AM
I've been using command
channel-group {#} mode {on|desirable|...etc}
for port-channel negotiation. However, I saw this command
channel-protocol {pagp|lacp}
on Cisco doco but I'm not really sure the implication compared with channel-group command. Is there something superfluous or there is more about it?
Regards,
David Sudjiman
Solved! Go to Solution.
05-19-2009 05:02 AM
If you enter "channel-group mode passive" under the interface, entering "channel-protocol pagp" won't change the etherchannel mode.
In the same token, on this scenario neither LACP nor PAgP will work as the channel-protocol and channel-group must match if you decide to use channel-protocol command.
__
Edison.
05-16-2009 03:06 AM
Hi.
Channel-protocol command is for setting whether you want to sue Cisco's original, but proprietary, PAgP protocol for etherchanneling or you will use the IEEE standard LACP protocol.
Depending on protocol you keywords for the mode command will differ (LACP has active and passive where PAgP has desirable and auto).
HTH
05-16-2009 04:30 AM
I have never really understood why that command is there , if you use channel-group mode desirable it is pagp and if you use channel-group mode active it is lacp so why is the extra command even there as they work without it ?
05-16-2009 12:05 PM
David,
Use the channel-protocol command only to restrict a channel to LACP or PAgP. If you set the protocol by using the channel-protocol command, the setting is not overridden by the channel-group interface configuration command.
You must use the channel-group interface configuration command to configure the EtherChannel parameters. The channel-group command also can set the mode for the EtherChannel.
You cannot enable both the PAgP and LACP modes on an EtherChannel group.
PAgP and LACP are not compatible; both ends of a channel must use the same protocol.
HTH,
__
Edison.
05-19-2009 04:50 AM
Sorry, I still don't understand this
"If you set the protocol by using the channel-protocol command, the setting is not overridden by the channel-group interface configuration command."
Could you please elaborate?
05-19-2009 05:02 AM
If you enter "channel-group mode passive" under the interface, entering "channel-protocol pagp" won't change the etherchannel mode.
In the same token, on this scenario neither LACP nor PAgP will work as the channel-protocol and channel-group must match if you decide to use channel-protocol command.
__
Edison.
05-29-2009 01:21 AM
Thanks Edison!
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: