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  • LACP mode configuration (Cisco)

    Design & Configure

    LACP mode configuration (Cisco)

    This configuration shows how to set up LACP modes on a Cisco switch.

    Technology: Switching
    Area: Link aggregation
    Vendor: Cisco
    Software: 12.X , 15.X
    Platform: Catalyst platforms

    What is Link Aggregation Control Protocol (LACP)

    Link Aggregation Control Protocol IEEE 802.3ad is an open standard of Ethernet link aggregation. It allows Cisco switches such as Cisco Catalyst 9200 to manage Ethernet channels between switches that conform to the 802.3ad protocol. You can configure a maximum of 16 ports to form a channel depending on the IOS version and platform. Eight of the ports are in active mode and the other eight are in hot-standby mode. There are a few LACP modes: “active”, “passive” and “on”.

    First, to configure the logical EtherChannel interface:

    Switch#configure terminal
    Switch(config)#interface port-channel 5
    Then you need to assign the physical ports and specify LACP mode.

    LACP mode configuration

    Mode Active:

    The mode places a port into an active negotiating state, in which the port initiates negotiations with other ports by sending LACP packets.

    To configure the port as an LACP active mode:

    switch# configure terminal
    switch(config)# interface fastethernet 0/1
    switch(config-if)# channel-group 5 mode active

    To verify if ports are bundled:

    Switch#show ethernet channel summary

     

    Mode Passive:

    The mode places a port into a passive negotiating state, in which the port responds to LACP packets that it receives but does not initiate protocol negotiation.

     

    To configure the port as passive mode:

    switch# configure terminal
    switch(config)# interface fastethernet 0/1
    switch(config-if)# channel-group 5 mode paasive

    To verify if ports are bundled:

    Switch#show ethernet channel summary

     

    Mode On:

    All static EtherChannels, that is, the port is not running LACP messaging but static bundling. With this mode, the switch or the other end switch will not recognize any problem with the EtherChannel and will not tell about the problem.

    switch# configure terminal
    switch(config)# interface fastethernet 0/1
    switch(config-if)# channel-group 5 mode on

    To verify if ports are bundled:

    Switch#show ethernet channel summary

     

    Check how to configure PAgP on Cisco switch.

    Author: Marcin Bialy
     

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