<Jeremy's IT Lab> Day 23: Ethernet Channel

Ethernet Channel

 

A= Acces Layer switch , D= Distribution Layer switch

prob: oversubscription (speed lower, can't use multi interface because of STP)

sol: Ether channel (= Port channel , = LAG(link aggregation group))

=> multiple interface to act single interface, treat this group as single interface

 

<Channel Protocol>

- PAgP(Port Aggregation Protocol)

 -> IEEE 082.3ad

- LACP(Link Aggregation Control Protocol)

  -> Cisco

=> PAgP & LACP Dynamically negotiate create/maintenance Ether Channel

  -> member interface matching config the same duplex, speed, switch port mode, VLAN/ native VLAN

 

<Static>

- Static Ether Channel

  -> all vendors(protocol X), manually negotiate, statically configure to form EC

 

SW(config-if)# channel-group number mode {desirable | auto | active| passive | on}

- PAgP :

   > auto+ auto = no EC

   > auto + desirable = EC

   > desirable + desirable = EC

- LACP:

   > pass + pass = no EC

   > pass + active = EC

   > active + active = EC

- Static:

  > on + on = EC

 

CLI:

SW(config) port-channel load-balance mode

#config EC load-bal method on S

SW# show etherchannel load-balance

#display info ab/ load-bal settings

SW(config-if)# channel-group number mode {desirable | auto | active| passive | on}

#config inf to be part of EC

SW# show etherchannel summary

#display summary of EC on S

SW# show etherchannel port-channel

#display info ab/ virtual port-channel inf on S