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Figure 24-3. Creating a Dynamic LAG Example
The port-channel 32 mode active command shown above may be successfully issued as long as there is
no existing static channel-member configuration in LAG 32.
Set the LACP long timeout
PDUs are exchanged between port channel (LAG) interfaces to maintain LACP sessions. PDUs are
transmitted at either a slow or fast transmission rate, depending upon the LACP timeout value. The timeout
value is the amount of time that a LAG interface waits for a PDU from the remote system before bringing
the LACP session down. The default timeout value is 1 second; it can be configured to be 30 seconds.
Invoking the longer timeout might prevent the LAG from flapping if the remote system is up but
temporarily unable to transmit PDUs due to a system interruption.
To configure the LACP long timeout (Figure 196):
Note: The 30-second timeout is available for dynamic LAG interfaces only. The lacp long-timeout
command can be entered for static LAGs, but it has no effect.
Step Task Command Syntax Command Mode
1 Set the LACP timeout value to 30 seconds.
lacp long-timeout
CONFIG-INT-PO
FTOS(conf)#interface Gigabitethernet 3/15
FTOS(conf-if-gi-3/15)#no shutdown
FTOS(conf-if-gi-3/15)#port-channel-protocol lacp
FTOS(conf-if-gi-3/15-lacp)#port-channel 32 mode active
...
FTOS(conf)#interface Gigabitethernet 3/16
FTOS(conf-if-gi-3/16)#no shutdown
FTOS(conf-if-gi-3/16)#port-channel-protocol lacp
FTOS(conf-if-gi-3/16-lacp)#port-channel 32 mode active
...
FTOS(conf)#interface Gigabitethernet 4/15
FTOS(conf-if-gi-4/15)#no shutdown
FTOS(conf-if-gi-4/15)#port-channel-protocol lacp
FTOS(conf-if-gi-4/15-lacp)#port-channel 32 mode active
...
FTOS(conf)#interface Gigabitethernet 4/16
FTOS(conf-if-gi-4/16)#no shutdown
FTOS(conf-if-gi-4/16)#port-channel-protocol lacp
FTOS(conf-if-gi-4/16-lacp)#port-channel 32 mode active