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Creating a LAG
To create a dynamic port channel (LAG), use the following command. First you define the LAG and then the LAG interfaces.
● Create a dynamic port channel (LAG).
CONFIGURATION mode
interface port-channel
● Create a dynamic port channel (LAG).
CONFIGURATION mode
switchport
Dell(conf)#interface port-channel 32
Dell(conf-if-po-32)#no shutdown
Dell(conf-if-po-32)#switchport
The LAG is in the default VLAN. To place the LAG into a nondefault VLAN, use the tagged command on the LAG.
Dell(conf)#interface vlan 10
Dell(conf-if-vl-10)#tagged port-channel 32
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
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.
Link Aggregation Control Protocol (LACP)
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