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DELL Switch Link Aggregation

Posted on 2011-10-06
Medium Priority
Last Modified: 2012-05-12


I am trying to configure Link Aggregation on 3 DELL switches, 1 - 5448 and 2 - 3348, please see my snapshot if my configuration correct?
Question by:KANEWONG
  • 2
LVL 32

Expert Comment

ID: 36930851
What is your goal?

3348(B) is showing a LAG #1...which already exists for 3348(A).  Should it be #2?

If you are using the 5448 as the core switch, your layout appears to have the goal of increased bandwidth to each 3348 switch.  No extra redundancy.

The layout below will give you redundancy if the 5448 goes out.  LAG #3 will keep the 3348 switches connected.

5448:  11 22
3348(A): 11 33
3348(B): 22 33

You'll need to have STP enabled so that LAG#3 is ignored when the 5448 is functioning correctly.  STP will chose only one path, and ignore multiple alternate paths.

LAG has to use the same speed ports.  If your 3348 switches are mostly 10/100, you may have to use the slower ports (2x100Mb) for the redundant connection.

Author Comment

ID: 36932279

My goal is to increase the bandwidth from the 3348 to the root switch 5448, because I am planning to place the VMware ESX host in 5448 switch.

LVL 32

Accepted Solution

aleghart earned 1000 total points
ID: 36933960
Then this seems to be your best bet:

5448:  11 22
3348(A): 11
3348(B): 22

Your drawing says:

5448:  11 22
3348(A): 11
3348(B): 11

Which can't work.  You only have 2 ports for LAG#1 on the 5448.

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