C
HAPTER
5
| Interface Configuration
Trunk Configuration
– 167 –
u All ports on both ends of an LACP trunk must be configured for full
duplex, and auto-negotiation.
u 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 990).
PARAMETERS
These parameters are displayed:
Configure Aggregator
u 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)
u Timeout Mode – The timeout to wait for the next LACP data unit
(LACPDU):
n
Long Timeout – Specifies a slow timeout of 90 seconds. (This is
the default setting.)
n
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 the
transmit LACPDU interval to 1 second. When it receives an LACPDU set
with a long timeout from the actor, it adjusts the transmit LACPDU
interval to 30 seconds.
If the actor does not receive an LACPDU from its partner before the
configured timeout expires, the partner port information will be deleted
from the LACP group.
When a dynamic port-channel member leaves a port-channel, the
default timeout value will be restored on that port.
When a dynamic port-channel is torn down, the configured timeout
value will be retained. When the dynamic port-channel is constructed
again, that timeout value will be used.
Configure Aggregation Port - General
u Port – Port identifier. (Range: 1-28/52)
u LACP Status – Enables or disables LACP on a port.
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