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Dell Configuration Guide for the S4048–ON System 9.14.2.6

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Setting 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. You can configure the default timeout value 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.
NOTE The 30-second timeout is available for dynamic LAG interfaces only. You can enter the lacp long-timeout command for static LAGs, but it has no effect.

To configure LACP long timeout, use the following command.

Set the LACP timeout value to 30 seconds.
CONFIG-INT-PO mode
lacp long-timeout

Example of the lacp long-timeout and show lacp Commands

DellEMC(conf)# interface port-channel 32
DellEMC(conf-if-po-32)#no shutdown
DellEMC(conf-if-po-32)#switchport
DellEMC(conf-if-po-32)#lacp long-timeout
DellEMC(conf-if-po-32)#end
DellEMC# 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 -
Distribution disabled,
M - Partner Defaulted, N - Partner Non-defaulted, O - Receiver is in expired
state,
P - Receiver is not in expired state
Port Te 3/6 is enabled, LACP is enabled and mode is lacp
Actor Admin: State ADEHJLMP Key 1 Priority 128

To view the PDU exchanges and the timeout value, use the debug lacp command. For more information, refer to Monitoring and Debugging LACP.

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