port channel help

Unanswered Question
Nov 20th, 2008

guys can someone please clear few doubts regarding MST.....we have two 3560's swicthes there is 200M etherchannel as well.....now we have 10 vlans so all togather three instances )0,1 and 2

5 vlans are in mst1 and 5 vlans are in mst 2......i have a questions etherchannel is a logical bundle and Spanning tree looks at it as a single link right?? now managment has asked us to divide the vlans one port should run even vlans and other port should run odd vlans.....i mean is it possible as i thought that both instances travel togather on that channel port......i mean guys to be honest i am confused....can someone please help me

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Istvan_Rabai Thu, 11/20/2008 - 21:01

Hi,

I think the simplest way to do this is to remove the Ether-channel configuration completely and prune the unneeded vlans from the trunks on both sides of the links:

interface fa0/1

switchport trunk allowed vlan 1,3,5,7,9

interface fa0/2

switchport trunk allowed vlan 2,4,6,8,10

Cheers:

Istvan

The_guroo_2 Sat, 11/22/2008 - 05:00

ok what if i have four switches can we do the ablove mentioned excersie..

Istvan_Rabai Sat, 11/22/2008 - 05:20

Sure.

I suggest you to do it out of working hours, so the users are not affected by the change during their operation.

Cheers:

Istvan

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