Disable stack election

[mohdqawi87]

Hi guys,

We are using 3750 stackable switch with no stack presently. Wondering if we could disable the stack election process to boot the ios faster like other non stackable 3750 switches.

Thanks

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[InayathUlla Sharieff]

Abdul,

There is no way do it...

Hath

Regards

Inayath

I mean to say you can't do it... There is no way. 

[InayathUlla Sharieff]

There was once upon a time discussion on this:https://supportforums.cisco.com/message/758869#758869

Hath

Return

Inayath

******plz rate all usefull posts

[Leo Laohoo · Accepted solution]

Wondering if we could disable the stack election process to boot the ios faster like other non stackable 3750 switches.

If this is a standalone switch and you don't want it to go to a stack election everytime it boots, then use this:

conf t

switch 1 priority 15

end

This command "forces" the switch to have the maximum priority number of "15" which also means "I'm the master of this stack, period.  No election needed."

[mohdqawi87]

I just wanted to bring down the booting time and this surely helps. Thanks.

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[Leo Laohoo]

Thanks for the ratings.

Just make sure that if you are going to stack a second (or more) switch, the member switches have default (1) or less than 15 priority.

If the newly added stack member has the same priority, during the next stack reboot, the members with the same priority 15 will have a stack election.

If memory serves me correctly, the switch with the lowest MAC address will be the master.

[davidcolinsmith]

I just tested this with a WS-C2960S-24PS-L switch running 15.0(2)SE4 universal, and the command has zero effect on the boot time.  An election still occurs, and boot time is still 4:13.

If the console output is accurate, the actual election process on a single switch without any additional stack members attached is only a couple of seconds.

Very interesting!

[Leo Laohoo]

Stack election behaviour of the 3750-fleet vs 2960S is very different.

Do you have the stacking module installed?  If you do, did you try to remove the stacking module?

[murphs76]

I performed this test with a WS-C3750 running c3750-ipbasek9-mz.122-55.SE12.bin. Both times as a standalone switch once with switch priority 1 next with priority 15, ~2:58 each time.

[Joseph W. Doherty]

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Posting

Leo Laohoo wrote:
If this is a standalone switch and you don't want it to go to a stack election everytime it boots, then use this:
conf t
switch 1 priority 15
end
This command "forces" the switch to have the maximum priority number of "15" which also means "I'm the master of this stack, period.  No election needed."

Could you have more than one switch in a stack set to priority 15?

[Leo Laohoo]

Could you have more than one switch in a stack set to priority 15?

Yes you can.  You can have all members with priority 15 but during bootup ... he he he ... the entire stack will go into an election.

Ok, here's another "way out" if you have an entire stack set to "priority 15":  Boot up the entire stack, one-at-a-time and in the order of your choice.

Meaning, let's say you have switch 1 as the master, switch 2 as member 2, switch 3 as member 3, etc.

So you boot up switch 1 first, (I normally wait for 10-15 seconds) power up switch number 2, wait, power up switch 3, wait, power up switch 4, etc.

After that, every member of the switch will know their "place" and will not do an election.