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| Interface Configuration
C
5
HAPTER
Trunk Configuration
CLI R
EFERENCES
◆
"Link Aggregation Commands" on page 1215
C
U
OMMAND
SAGE
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.
If the LACP admin key is not set when a channel group is formed
N
:
OTE
(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
P
ARAMETERS
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)
Timeout Mode – The timeout to wait for the next LACP data unit
◆
(LACPDU):
Long Timeout – Specifies a slow timeout of 90 seconds. (This is
■
the default setting.)
Short Timeout – Specifies a fast timeout of 3 seconds.
■
The timeout is set in the LACP timeout bit of the Actor State field in
transmitted LACPDUs. When the partner switch receives an LACPDU
set with a short timeout from the actor switch, the partner adjusts
– 208 –
command described on
page
1224).
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