Administrator Guide

Dell(conf)#interface Gigabitethernet 4/15
Dell(conf-if-gi-4/15)#no shutdown
Dell(conf-if-gi-4/15)#port-channel-protocol lacp
Dell(conf-if-gi-4/15-lacp)#port-channel 32 mode active
...
Dell(conf)#interface Gigabitethernet 4/16
Dell(conf-if-gi-4/16)#no shutdown
Dell(conf-if-gi-4/16)#port-channel-protocol lacp
Dell(conf-if-gi-4/16-lacp)#port-channel 32 mode active
The port-channel 32 mode active command shown here may be successfully issued as long as there is no existing static channel-member
conguration in LAG 32.
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 congure the default timeout value to be 30 seconds. Invoking the longer timeout might prevent the LAG from apping
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 eect.
To congure 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
Dell(conf)# interface port-channel 32
Dell(conf-if-po-32)#no shutdown
Dell(conf-if-po-32)#switchport
Dell(conf-if-po-32)#lacp long-timeout
Dell(conf-if-po-32)#end
Dell# 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 Gi 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
.
Monitoring and Debugging LACP
The system log (syslog) records faulty LACP actions.
To debug LACP, use the following command.
Link Aggregation Control Protocol (LACP)
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