Cisco stackwise assistance

Answered Question
May 5th, 2010
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Hello,


We currently have 3 switches in a stack.


switch 1 provision ws-c3750g-48ts
switch 2 provision ws-c3750g-24ts
switch 3 provision ws-c3750g-48ts


3750G1#show switch detail
Switch/Stack Mac Address : 0011.9270.xx
                                           H/W   Current
Switch#  Role   Mac Address     Priority Version  State
----------------------------------------------------------
1       Member 001e.491e.xx     1      0       Ready              
*2       Master 0011.9270.1xx     1      0       Ready              
3       Member 0017.9470.xx     3      0       Ready



         Stack Port Status             Neighbors    
Switch#  Port 1     Port 2           Port 1   Port 2
--------------------------------------------------------
  1        Ok         Ok                2        3
  2        Ok         Ok                3        1
  3        Ok         Ok                1        2


3750G#



Right now I have switch 4 configured as:


switch 4 provision ws-c3750g-24ts


Is that all that is needed and then just cable it in the same pattern?


Thank you.

Correct Answer by John Blakley about 6 years 10 months ago

From what I know, the cables can be swapped. If the whole stack isn't rebooted, then a reelection shouldn't occur as long as the master isn't rebooted. You can set your master by priority number like


switch 3 priority 15 (0 - 15 are valid)


Switch#  Role   Mac Address     Priority Version  State
----------------------------------------------------------
1       Member 0024.50da.ff00     1      0       Ready
*2       Master 0012.d975.6100     15     0       Ready
3       Member 0013.1922.b000     14     0       Ready
4       Member 0013.1922.ea00     13     0       Ready
5       Member 0015.f937.6780     12     0       Ready
6       Member 001c.577a.a700     1      0       Ready



My switch master is 2. The priority is 15. If my stack reboots, my switch 2 will always come back up as master. On a side note, I've always shut my switch down that I was connecting the new cable to, to be on the safe side. =)


HTH,

John

Correct Answer by atrzonkowski about 6 years 10 months ago

John


If you want to set the switches priority you can use the command: switch priority in global


While I've never done a hot swap of cables while the switches were live I believe you can do so. In the past I've always just powered them down to do so. I'm sure someone could provide better guidance on that than me.

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John Blakley Wed, 05/05/2010 - 12:28
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Should be. Make sure the switch that you're adding has the same IOS on it. I would set a window and downtime to add the switch to the stack. It may start negotiating for a stack master and bring the switch stack down until that happens.


HTH,

John

itproconsultants Wed, 05/05/2010 - 12:38
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Hi John,


Are the cables hot swappable?


And how can I set the priorites of the switches so that there is no election and that the configuration won't change?


Thanks again,


    John

Correct Answer
atrzonkowski Wed, 05/05/2010 - 12:47
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John


If you want to set the switches priority you can use the command: switch priority in global


While I've never done a hot swap of cables while the switches were live I believe you can do so. In the past I've always just powered them down to do so. I'm sure someone could provide better guidance on that than me.

Correct Answer
John Blakley Wed, 05/05/2010 - 12:48
User Badges:
  • Purple, 4500 points or more

From what I know, the cables can be swapped. If the whole stack isn't rebooted, then a reelection shouldn't occur as long as the master isn't rebooted. You can set your master by priority number like


switch 3 priority 15 (0 - 15 are valid)


Switch#  Role   Mac Address     Priority Version  State
----------------------------------------------------------
1       Member 0024.50da.ff00     1      0       Ready
*2       Master 0012.d975.6100     15     0       Ready
3       Member 0013.1922.b000     14     0       Ready
4       Member 0013.1922.ea00     13     0       Ready
5       Member 0015.f937.6780     12     0       Ready
6       Member 001c.577a.a700     1      0       Ready



My switch master is 2. The priority is 15. If my stack reboots, my switch 2 will always come back up as master. On a side note, I've always shut my switch down that I was connecting the new cable to, to be on the safe side. =)


HTH,

John

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