In this tutorial we will Learn how to configure verify and troubleshoot LACP (Link Aggregation or Ether Channel). Actually Link Aggregation or Ether Channel is a technology very similar to PAgP which allows two or more than two physical ports to combine and provide a new third single logical port which results in high availability and increased bandwidth. In below topology diagram you can see two switches switch0 and switch1 having ports fa0/1 and fa0/2.Using LACP we can bind these two ports to form a single logical port.
Remember LACP is open standard as defined by IEEE 802.3ad standard.
LACP(link aggregation control protocol) have two working mode port one is acive mode and other is passive mode.Passive is equivalent of the PAGP auto and active is equivalent to PAGP desirable mode.
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STEP 1:Configure LACP on Switch0
Switch>enable Switch#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Switch(config)#host switch0 switch0(config)#interface range fa0/1-2 switch0(config-if-range)#channel-group 1 mode active
STEP 2:Configure LACP on Switch1
Switch>enable Switch#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Switch(config)#host switch1 switch1(config)#int range fa0/1-2 switch1(config-if-range)#channel-group 1 mode active switch1(config-if-range)#channel-protocol lacp
STEP 3:Verify LACP Configuration on cisco switch.
switch0#show etherchannel summary Flags: D - down P - in port-channel I - stand-alone s - suspended H - Hot-standby (LACP only) R - Layer3 S - Layer2 U - in use f - failed to allocate aggregator u - unsuitable for bundling w - waiting to be aggregated d - default port Number of channel-groups in use: 1 Number of aggregators: 1 Group Port-channel Protocol Ports ------+-------------+-----------+---------------------------------------------- 1 Po1(SU) LACP Fa0/1(P) Fa0/2(P)