ECS4110-28T_Management Guide

C HAPTER 5 | Interface Configuration
Trunk Configuration
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COMMAND USAGE
◆ To avoid creating a loop in the network, be sure you enable LACP before
connecting the ports, and also disconnect the ports before disabling
LACP.
◆ If the target switch has also enabled LACP on the connected ports, the
trunk will be activated automatically.
◆ A trunk formed with another switch using LACP will automatically be
assigned the next available trunk ID.
◆ If more than eight ports attached to the same target switch have LACP
enabled, the additional ports will be placed in standby mode, and will
only be enabled if one of the active links fails.
◆ All ports on both ends of an LACP trunk must be configured for full
duplex, and auto-negotiation.
◆ Ports are only allowed to join the same Link Aggregation Group (LAG) if
(1) the LACP port system priority matches, (2) the LACP port admin key
matches, and (3) the LAG admin key matches (if configured). However,
if the LAG admin key is set, then the port admin key must be set to the
same value for a port to be allowed to join that group.
N OTE : If the LACP admin key is not set when a channel group is formed
(i.e., it has a null value of 0), the operational value of this key is set to the
same value as the port admin key used by the interfaces that joined the
group (see the show lacp internal command described on page 1030).
PARAMETERS
These parameters are displayed:
Configure Aggregator
◆ Admin Key – LACP administration key is used to identify a specific link
aggregation group (LAG) during local LACP setup on the switch.
(Range: 0-65535)
If the port channel admin key is not set when a channel group is
formed (i.e., it has the null value of 0), this key is set to the same value
as the port admin key (see Configure Aggregation Port - Actor/Partner)
used by the interfaces that joined the group. Note that when the LAG is
no longer used, the port channel admin key is reset to 0.
If the port channel admin key is set to a non-default value, the
operational key is based upon LACP PDUs received from the partner,
and the channel admin key is reset to the default value. The trunk
identifier will also be changed by this process.
◆ Timeout Mode – The timeout to wait for the next LACP data unit
(LACPDU):