PAgP - silent and non-silent modes

Mar 22, 2006 1 Replies
A
PAgP - silent and non-silent modes open original image

Can anyone clarify if the differences between the silent and non-silent modes for PAgP.



As I understand it if the mode is auto or desirable there are 2 sub modes, silent and non-silent. If it is silent no packets are required from the far end for the port to be put into the port channel. If it is non-silent it will wait until it hears PAgP packets from the far end before it puts the port into the channel.



If that is the case what is the difference between auto silent and desirable silent as it appears both result in the port being added to the channel?



Cheers Andy


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C

I believe the "silent/non-silent" attribute does not refer to the presence or absence of PAgP packets. Instead it indicates if the peer at the other end will be a source (or not) of BPDUs or other traffic having nothing to do with PAgP.

Thus "auto silent" mode means the port will not initiate port bundling using PAgP and also should not expect to receive BPDUs or other traffic on that port.

And "desirable silent" mode would mean that the port will actively try and bundle ports into a channel using PAgP but would not expect BPDUs or other traffic on that port.

Cisco da Gama

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