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Sunday, April 25, 2010

Question 22

What protocol or protocols can be used to form an Etherchannel?

1 comments:

Packets Analyzed said...

PAgP - Port Aggregation Protocol (Cisco Proprietary)

LACP - Link Aggregate Control Protocol.(open standard 802.3ad)

Modes
-Active, Used by LACP and initiates and negotiates the forming of an aggregate. Will form if the other end is Active or Passive.
-Passive, Used by LACP does not initiate the forming of an aggregate. Will form if the other end is Active. Passive to passive will not form an aggregate.
-Auto, Used by PAgP does not initiate the forming of an aggregate. Will form if the other end is Desirable. Auto to Auto will not form an aggregate
-Desirable, Used by PAgP and initiates and negotiates the forming of an aggregate. Will form if the other end is Desirable or Auto.

LACP on one end and PAgP on the other will not form an aggregate.

Example with LACP (PAgP is similiar except it uses PAgP paramters.

-On, Link aggregation is forced and LACP or PAgP is not used.
-Off, Link aggregation will not form and LACP or PAgP is not used.


interface fas 0/1
channel-group 1 mode active
inter fas 0/2
channel-group 1 mode active

This forms a portchannel

Load balancing over the aggregate can use one of the following (global config)
port-channel load-balance {dst-ip | dst-mac | src-dst-ip | src-dst-mac | src-ip |
src-mac

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