Link Aggregation Control Protocol | 545Figure 24-3. Creating a Dynamic LAG ExampleThe port-channel 32 mode active command shown above may be successfully issued as long as there isno existing static channel-member configuration in LAG 32.Set the LACP long timeoutPDUs are exchanged between port channel (LAG) interfaces to maintain LACP sessions. PDUs aretransmitted at either a slow or fast transmission rate, depending upon the LACP timeout value. The timeoutvalue is the amount of time that a LAG interface waits for a PDU from the remote system before bringingthe LACP session down. The default timeout value is 1 second; it can be configured to be 30 seconds.Invoking the longer timeout might prevent the LAG from flapping if the remote system is up buttemporarily unable to transmit PDUs due to a system interruption.To configure the LACP long timeout (Figure 196):Note: The 30-second timeout is available for dynamic LAG interfaces only. The lacp long-timeoutcommand can be entered for static LAGs, but it has no effect.Step Task Command Syntax Command Mode1 Set the LACP timeout value to 30 seconds. lacp long-timeout CONFIG-INT-POFTOS(conf)#interface Gigabitethernet 3/15FTOS(conf-if-gi-3/15)#no shutdownFTOS(conf-if-gi-3/15)#port-channel-protocol lacpFTOS(conf-if-gi-3/15-lacp)#port-channel 32 mode active...FTOS(conf)#interface Gigabitethernet 3/16FTOS(conf-if-gi-3/16)#no shutdownFTOS(conf-if-gi-3/16)#port-channel-protocol lacpFTOS(conf-if-gi-3/16-lacp)#port-channel 32 mode active...FTOS(conf)#interface Gigabitethernet 4/15FTOS(conf-if-gi-4/15)#no shutdownFTOS(conf-if-gi-4/15)#port-channel-protocol lacpFTOS(conf-if-gi-4/15-lacp)#port-channel 32 mode active...FTOS(conf)#interface Gigabitethernet 4/16FTOS(conf-if-gi-4/16)#no shutdownFTOS(conf-if-gi-4/16)#port-channel-protocol lacpFTOS(conf-if-gi-4/16-lacp)#port-channel 32 mode active
