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fariha zain
Beginner

3750-Stack port down when connected-- Please help.

ssue:
======
Replaced the faulty switch with the new one after which I see the port was shown down.

europe3750#sh switch detail
Switch/Stack Mac Address : bbde.4B9H.5690
                                           H/W   Current
Switch#  Role   Mac Address     Priority Version  State
----------------------------------------------------------
 1       Member 7012.cH5h.dn00     1      1       Ready
*2       Master bbde.4B9H.5690     15     1       Ready

europe3750# Show switch stack-port

         Stack Port Status             Neighbors
Switch#  Port 1     Port 2           Port 1   Port 2
--------------------------------------------------------
  1       Down        Ok              None       2 >>>>>>> Port showing down.
  2        Ok        Down               1      None

 

Hence Troubleshooting done:
=========================
Replacing the stack cable. >> No issues as this stack cable working fine.


Resolved after rebooting the switch.
========
Tried reseating the stack cable

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

==
Question:
=============
Why did reboot resolved the issue?
Is there any communication error when we connect the stack cable between the switches?
Does it always required to reboot the issue connecting the switches in stacking? If yes can you please guide me the communication happening between each other?

2 REPLIES 2
Emmanuel Valdez
Participant

Hi,

When the switches boot, they need to select if it will be Master or Member of the stack, which of them do you replace?

Regards.

Rajeev Sharma
Cisco Employee

Hey,

How did you replace the faulty switch?

Regards,

RS.