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New Member

3750 - Switch removal - port down

Hi all.

Today i decomissioned a switch from my 3750 stack. Upon recabling my stack i have lost a member from the pool. The switch is operational and performing as normal but is missing from the stack. Upon closer inspection it appears a port is down. The same cable's are being used before the switch removal and the ports were working fine prior to this also.

switch1>show switch

                                               Current

Switch#  Role      Mac Address     Priority     State

--------------------------------------------------------

1       Slave     0013.c406.4780     8         Ready

*2       Master    0013.c490.2700     9         Ready

3       Slave     0000.0000.0000     0         Provisioned

4       Slave     0000.0000.0000     0         Provisioned

5       Slave     001c.f932.c180     1         Ready

Switch 4 was removed from the stack.

Switch 3 is showing as 'Provisioned' but is up, running and cabled correctly.

switch1>show switch detail

                                               Current

Switch#  Role      Mac Address     Priority     State

--------------------------------------------------------

1       Slave     0013.c406.4780     8         Ready

*2       Master    0013.c490.2700     9         Ready

3       Slave     0000.0000.0000     0         Provisioned

4       Slave     0000.0000.0000     0         Provisioned

5       Slave     001c.f932.c180     1         Ready

         Stack Port Status             Neighbors

Switch#  Port 1     Port 2           Port 1   Port 2

--------------------------------------------------------

  1        Ok         Ok                2      None

  2        Ok         Ok                1        5

  5        Ok        Down               2      None

It appears there are some ports down but i have checked all the cabling which appears to be correct.

The switch that was removed ( Switch 4 ) was at the bottom of the stack in terms of cabling when it was removed. Switch 3 is now at the bottom of the stack and appears to be missing?

Thanks.

Everyone's tags (4)
9 REPLIES

3750 - Switch removal - port down

Hi Jamie,

Can you provide details on how the stackwise cables are ordered. Using the layout of the second table from 'sh switch detail' .

cheers,

Seb.

New Member

3750 - Switch removal - port down

Hi Seb.

The order of the switches are as follows:

switch 1-5

switch 1-2

switch 1-1

switch 1-3

switch 1-4

Switch 1-4 was removed and the cabling amended so the new layout looks like this:

switch 1-5

switch 1-2

switch 1-1

switch 1-3

Currently Switch 1-3 is 'missing' but still operational. Same cables that were being used and were working fine.

New Member

Re: 3750 - Switch removal - port down

Did you remove switch 4 when the stack was up and running? If all your connections are correct, then try to reload the stack i expect the issue will be cleared after that

Sent from Cisco Technical Support iPhone App

New Member

Re: 3750 - Switch removal - port down

Switch 4 was powered off... Cabling removed, and re-cabled to the new layout shown above.

'Reload Stack'... Would this be rebooting the stack? Unfortunately this is a 'live' environment. Is there a way to resolve this without rebooting the Switch Stack?

3750 - Switch removal - port down

Can you console onto switch3 and check the logs? Is there anything related to stack ports?

What is the output of 'sh switch detail' ?

New Member

3750 - Switch removal - port down

I haven't got console access to switch3 right now but here is the output of 'sh switch detail'

switch1>show switch detail

                                               Current

Switch#  Role      Mac Address     Priority     State

--------------------------------------------------------

1       Slave     0013.c406.4780     8         Ready

*2       Master    0013.c490.2700     9         Ready

3       Slave     0000.0000.0000     0         Provisioned

4       Slave     0000.0000.0000     0         Provisioned

5       Slave     001c.f932.c180     1         Ready

         Stack Port Status             Neighbors

Switch#  Port 1     Port 2           Port 1   Port 2

--------------------------------------------------------

  1        Ok         Ok                2      None

  2        Ok         Ok                1        5

  5        Ok        Down               2      None

Switch 4 has been removed.

New Member

3750 - Switch removal - port down

Try to remove 3 from the stack, and also remove 4 from your config

follow this instructions, I hope this will help

https://supportforums.cisco.com/docs/DOC-3794

New Member

3750 - Switch removal - port down

I shall remove the config for switch4 but currently switch3 is a production switch and serving traffic. If i remove it from the stack will this not stop the switch from functioning? Also, i want switch3 to be in 'play' not removed from the stack.

Hall of Fame Super Gold

3750 - Switch removal - port down

Wrong forum, post in "LAn and switching". You can move your posting using the Actions panel on the right.

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