Nortel Alteon OS 42C4911 Application Manual page 102

Alteon OS Application Guide
LACP automatically determines which member links can be aggregated and then aggregates
them. It provides for the controlled addition and removal of physical links for the link aggrega-
tion.
Each port in the GbESM can have one of the following LACP modes.
off (default)
The user can configure this port in to a regular static trunk group.
active
The port is capable of forming an LACP trunk. This port sends LACPDU packets to part-
ner system ports.
passive
The port is capable of forming an LACP trunk. This port only responds to the LACPDU
packets sent from an LACP active port.
Each active LACP port transmits LACP data units (LACPDUs), while each passive LACP
port listens for LACPDUs. During LACP negotiation, the admin key is exchanged. The LACP
trunk group is enabled as long as the information matches at both ends of the link. If the admin
key value changes for a port at either end of the link, that port's association with the LACP
trunk group is lost.
When the system is initialized, all ports by default are in LACP off mode and are assigned
unique admin keys. To make a group of ports aggregatable, you assign them all the same
admin key. You must set the port's LACP mode to active to activate LACP negotiation. You
can set other port's LACP mode to passive, to reduce the amount of LACPDU traffic at the ini-
tial trunk-forming stage.
Use the /info/l2/trunk command or the /info/l2/lacp/dump command to check
whether the ports are trunked.
N – If you configure LACP on ports with 802.1x network access control, make sure the
OTE
ports on both sides of the connection are properly configured for both LACP and 802.1x.
102 Chapter 4: Ports and Trunking 42C4911, January 2007