Adding switch to existing stack(Cisco 3750)

  •  Check current stack settings

#show switch

adding_switch_to_stack1.png

 

  • Raise priority on current master stack to be be sure it will be elected as a master during next election

(config)#switch 1 priority 15

 

adding_switch_to_stack3.png

 confirm new settings

 #show switch

adding_switch_to_stack4.png

 

  • check IOS version on both switches - should be the same

generally should be the same but IOS which differ on minor change should work(12.2(25r) ipbase-m

  • Check stack settings on new switch

 #show switch

adding_switch_to_stack5.png

 

as we see new switch has default settings(number and priority)

  • connect stack cable between switches(below examples - source Cisco site)

adding_switch_to_stack19.png

stack(2 switches)

 

adding_switch_to_stack20.png

stack(4 switches)

 

 

  • power on new switch
  • check stack status

#show switch

adding_switch_to_stack6.png

adding_switch_to_stack9.png

bingo!new switch joined to stack

New switch has choosen the lowest free number (2) because it was conflict between master and him.

  • check bus speed of current stack

 #show switch stack-ring speed

adding_switch_to_stack7.png

it shows only 16G so it means one cable is not connected or is broken

#show switch neighbors

 adding_switch_to_stack8.png

 #show switch stack-ports summary

adding_switch_to_stack10.png

 

 we see port 1 on first switch has no connectivity to port 2 on second switch.

 

  • check physically stack cables and stack ports and after that type commands again

#show switch stack-ports

adding_switch_to_stack14.png

 #show switch stack-ports summary

adding_switch_to_stack15.png

 after physicall works - success!

 

  • check again stack speed and activity

#show switch stack-ring speed

adding_switch_to_stack16.png

Now we have full speed (32Gbps) and redundancy (Full).

#show switch stack-ring activity

 adding_switch_to_stack17.png

  •  Check again stack status

#show switch detail

adding_switch_to_stack18.png

 

dzbanek 2012-10-15

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