01-28-2017 01:29 AM - edited 03-08-2019 09:05 AM
hello
i've never seen the "channel protocol lacp/pagp" command before in all the study material i've seen
i've seen and configured EtherChannels myself without it
interface range ____
channel-group _ mode ___
what's going on with this?
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01-28-2017 03:28 AM
Hello
Channel protocol -lacp/pagp
I think there isnt any need for this command in aggregation ports. as the channel protocol is negotiated with the active/passive or desirable/auto int the channel-group x mode command.
If you set the same protocol on the physical interfaces>
int /x/
channel-protocol pagp
channel-group x mode desirable/auto
or
int /x/
channel-protocol lacp
channel-group x mode active/passive
then its allowed, however is you set the reverse it wont be.
int /x/
channel-protocol pagp
channel-group x mode active/passive
My view , I think this can be applied to single interfaces facing some server but its not applicable in present ehterchanneling
res
Paul
01-28-2017 03:28 AM
Hello
Channel protocol -lacp/pagp
I think there isnt any need for this command in aggregation ports. as the channel protocol is negotiated with the active/passive or desirable/auto int the channel-group x mode command.
If you set the same protocol on the physical interfaces>
int /x/
channel-protocol pagp
channel-group x mode desirable/auto
or
int /x/
channel-protocol lacp
channel-group x mode active/passive
then its allowed, however is you set the reverse it wont be.
int /x/
channel-protocol pagp
channel-group x mode active/passive
My view , I think this can be applied to single interfaces facing some server but its not applicable in present ehterchanneling
res
Paul
01-29-2017 08:54 PM
in CCNA material, i've never seen it
it was actually a CCNP guide where i saw it
seems like it doesn't do anything
05-29-2017 10:15 PM
The channel-Protocol command in not necessary, the ether channel will form just fine without it. The reason for the channel-protocol command was that people found the various terms such as Active/Passive/Desirable/Auto/On etc confusing, which follow when you type channel-group X mode ? Therefore some bright guy came up with the channel-protocol command, so that when this command is on an interface, the channel-group X mode will only accept commands which go with the protocol you define. Eg. if you selected channel-protocol to be LACP, it will only accept the active/passive argument with the channel-group command, nothing else. So you can't accidentally specify the protocol to be lacp and then turn round any try to use the mode desirable with the channel-group command.
See below from cisco switch: see it rejected the desirable argument/because the protocol is lacp
ALS2(config)#int fast 0/20
ALS2(config-if)#switchport mode access
ALS2(config-if)#channel-protocol lacp
ALS2(config-if)#channel-group 20 mode desirable
Command rejected (Channel protocol mismatch for interface Fa0/20 in group 20): the interface can not be added to the channel group
08-22-2019 05:21 PM
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