Reference Guide

Link Aggregation Control Protocol | 533
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 :
FTOS(conf)# interface port-channel 32
FTOS(conf-if-po-32)#no shutdown
FTOS(conf-if-po-32)#switchport
FTOS(conf-if-po-32)#lacp long-timeout
FTOS(conf-if-po-32)#end
FTOS# show lacp 32
Port-channel 32 admin up, oper up, mode lacp
Actor System ID: Priority 32768, Address 0001.e800.a12b
Partner System ID: Priority 32768, Address 0001.e801.45a5
Actor Admin Key 1, Oper Key 1, Partner Oper Key 1
LACP LAG 1 is an aggregatable link
A - Active LACP, B - Passive LACP, C - Short Timeout, D - Long Timeout
E - Aggregatable Link, F - Individual Link, G - IN_SYNC, H - OUT_OF_SYNC
I - Collection enabled, J - Collection disabled, K - Distribution enabled L - Distribu-
tion disabled,
M - Partner Defaulted, N - Partner Non-defaulted, O - Receiver is in expired state,
P - Receiver is not in expired state
Port Gi 10/6 is enabled, LACP is enabled and mode is lacp
Actor Admin: State ADEHJLMP Key 1 Priority 128
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
Note: View PDU exchanges and the timeout value using the command debug lacp. Refer to Monitor and
Debugging LACP.