Configuring the LAG Interfaces as DynamicAfter creating a LAG, configure the dynamic LAG interfaces.To configure the dynamic LAG interfaces, use the following command.• Configure the dynamic LAG interfaces.CONFIGURATION modeport-channel-protocol lacpExample of the port-channel-protocol lacp CommandDell(conf)#interface TenGigabitethernet 3/15/1Dell(conf-if-te-3/15/1)#no shutdownDell(conf-if-te-3/15/1)#port-channel-protocol lacpDell(conf-if-te-3/15/1-lacp)#port-channel 32 mode active...Dell(conf)#interface TenGigabitethernet 3/16/1Dell(conf-if-te-3/16/1)#no shutdownDell(conf-if-te-3/16/1)#port-channel-protocol lacpDell(conf-if-te-3/16/1-lacp)#port-channel 32 mode active...Dell(conf)#interface TenGigabitethernet 4/15/1Dell(conf-if-te-4/15/1)#no shutdownDell(conf-if-te-4/15/1)#port-channel-protocol lacpDell(conf-if-te-4/15/1-lacp)#port-channel 32 mode active...Dell(conf)#interface TenGigabitethernet 4/16/1Dell(conf-if-te-4/16/1)#no shutdownDell(conf-if-te-4/16/1)#port-channel-protocol lacpDell(conf-if-te-4/16/1-lacp)#port-channel 32 mode activeThe port-channel 32 mode active command shown here may be successfully issued as long as there isno existing static channel-member configuration in LAG 32.Setting the LACP Long TimeoutPDUs 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 systembefore bringing the LACP session down. The default timeout value is 1 second. You can configure thedefault timeout value to be 30 seconds. Invoking the longer timeout might prevent the LAG from flappingif 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 lacplong-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 modelacp long-timeoutExample of the lacp long-timeout and show lacp CommandsDell(conf)# interface port-channel 32Dell(conf-if-po-32)#no shutdownDell(conf-if-po-32)#switchportDell(conf-if-po-32)#lacp long-timeoutLink Aggregation Control Protocol (LACP) 499
