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Configuring the LAG Interfaces as Dynamic
After creating a LAG, configure the dynamic LAG interfaces.
To configure the dynamic LAG interfaces, use the following command.
• Configure the dynamic LAG interfaces.
CONFIGURATION mode
port-channel-protocol lacp
Example of the port-channel-protocol lacp Command
Dell(conf)#interface Tengigabitethernet 3/15
Dell(conf-if-te-3/15)#no shutdown
Dell(conf-if-te-3/15)#port-channel-protocol lacp
Dell(conf-if-te-3/15-lacp)#port-channel 32 mode active
...
Dell(conf)#interface Tengigabitethernet 3/16
Dell(conf-if-te-3/16)#no shutdown
Dell(conf-if-te-3/16)#port-channel-protocol lacp
Dell(conf-if-te-3/16-lacp)#port-channel 32 mode active
...
Dell(conf)#interface Tengigabitethernet 4/15
Dell(conf-if-te-4/15)#no shutdown
Dell(conf-if-te-4/15)#port-channel-protocol lacp
Dell(conf-if-te-4/15-lacp)#port-channel 32 mode active
...
Dell(conf)#interface Tengigabitethernet 4/16
Dell(conf-if-te-4/16)#no shutdown
Dell(conf-if-te-4/16)#port-channel-protocol lacp
Dell(conf-if-te-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 configuration 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 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
Dell(conf)# interface port-channel 32
Dell(conf-if-po-32)#no shutdown
Link Aggregation Control Protocol (LACP)
517