Etherchannel

By | 26/03/2014

LCAP – Link Aggregation Control Protocol – Standard 802.3ad

  • Active / Passive

PAgP –  Port Aggregation Protocol – Cisco Propietary

  • Auto / Desirable

Mode On – doesn’t define the protocol.

Both ports in the etherchannel need to have the same configuration (vlan and trunks).

Traffic flow goes through one of the links, it doesn’t use the two links. The decission is takes based on a hash algorithm that uses MAC, IP and/or TCP port.

Configuration example:

SW1(config-if)# channel-group 1 mode desirable
SW2(config-if)# channel-group 1 mode desirable
show interface port-channel 1

 

SW1 ModeSW2 ModeResult
OnOnOk, but no PAgP neither LACP
DesirableDesirablePAgP
DesirableAutoPAgP
AutoAutoFails
ActiveActiveLACP
ActivePassiveLACP
PassivePassiveFails

 

 

 

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