Forum Discussion
Mar 23, 2010
Just to make sure, What's your channel-protocol on the cisco port configured as?
I've always used active/active, it's reccomened...
Not an end all doc to 802.3ad, but some info.. (from the below link)
LACP trunking supports four modes of operation, as follows:
On: The link aggregation is forced to be formed without any LACP negotiation .In other words, the switch will neither send the LACP packet nor process any incoming LACP packet. This is similar to the on state for PAgP.
Off: The link aggregation will not be formed. We do not send or understand the LACP packet. This is similar to the off state for PAgP.
Passive: The switch does not initiate the channel, but does understand incoming LACP packets. The peer (in active state) initiates negotiation (by sending out an LACP packet) which we receive and reply to, eventually forming the aggregation channel with the peer. This is similar to the auto mode in PAgP.
Active: We are willing to form an aggregate link, and initiate the negotiation. The link aggregate will be formed if the other end is running in LACP active or passive mode. This is similar to the desirable mode of PAgP.
There are only three valid combinations to run the LACP link aggregate, as follows:
active
active
Comments- Recommended.
active
passive
comments- Link aggregation occurs if negotiation is successful.
on
on
comments- Link aggregation occurs without LACP. Although this works, it is not recommended.
Note: By default, when an LACP channel is configured, the LACP channel mode is passive.
http://www.cisco.com/en/US/tech/tk389/tk213/technologies_configuration_example09186a0080094470.shtml