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  • PAgP configuration (Cisco)

    Design & Configure

    PAgP configuration (Cisco)

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

    Port Aggregation Protocol (PAgP) is a Cisco proprietary protocol which is used for the automated, logical aggregation of Ethernet switch ports, known as an Ether Channel. There are two modes of PAgP:

    • Auto mode: it passively negotiates PAgP aggregation. If the remote end of the link is also configured with Auto mode, a PAgP EtherChannel will not form. Auto side is waiting for negotiation to start from the other end.
    • Desirable mode:that actively negotiates PAgP. The remote end must be configured in Auto or Desirable mode for a PAgP EtherChannel to form.

     

    To configure interface to talk actively with PAgP packects (desirable mode):

    Switch#configure terminal
    Switch(configure)#interface range f0/1 - 2
    Switch(configure-if-range)#channel-group 5 mode desirable
    Switch(configure-if-range)#end

    To verify if the ether channel is formed use following show command:


    Switch#show ethernet channel summary

     

    To configure interface to wait with PAgP to respond to PAgP packets from other end (auto mode):

    Switch#configure terminal
    Switch(configure)#interface range f0/1 - 2
    Switch(configure-if-range)#channel-group 5 mode auto
    Switch(configure-if-range)#end

    To verify if the ether channel is formed use following show command:


    Switch#show ethernet channel summary

     

    Check how to configure LACP on Cisco switches.

    Author: Marcin Bialy
     

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