Whole Stack Neighbor problem

Unanswered Question
Jan 6th, 2010
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Hi,

I have 7 numbers of 3750 Cisco Switch, they all are part of single stack. I found, there was flapping in the stack ports of Sw-3 (port-2) and Sw-4(port-1) which are directly connected with stack cable.


I have replaced the stack cable with new one, but now whole stack is flapping. Please help, I have attached the log below.


3730741: Jan  6 00:21:34.368: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch3 has changed to state UP
3730742: Jan  6 00:21:35.291: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 4 has changed to state UP
3730743: Jan  6 00:21:36.382: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 3 has changed to state DOWN
3730744: Jan  6 00:21:37.304: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch4 has changed to state DOWN
3730745: Jan  6 00:21:38.319: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 4 has changed to state UP

STACK#sh switch neighbor
  Switch #    Port 1       Port 2
  --------    ------       ------
      1        None          None
      2         1             3
      3         2            None
      4        None          None
      5         4             6
      6        None          None
      7        None           1


STACK#sh switch
Switch/Stack Mac Address : 0011.bbf1.4780
                                           H/W   Current
Switch#  Role   Mac Address     Priority Version  State
----------------------------------------------------------
*1       Master 0011.bbf1.4780     15     0       Ready
2       Member 0017.9409.4600     13     0       Ready
3       Member 0012.4347.0800     11     0       Ready
4       Member 0017.5ac4.2c00     9      0       Ready
5       Member 0017.95a9.5600     7      0       Ready
6       Member 000f.f749.5580     5      0       Ready
7       Member 0017.957f.5c00     3      0       Ready


STACK#sh swit stack-ring sp

Stack Ring Speed        : 16G
Stack Ring Configuration: Half
Stack Ring Protocol     : StackWise

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Reza Sharifi Wed, 01/06/2010 - 06:27
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    2017 LAN

Hello Rupesh,


Please take a look at this document for troubleshooting your stack.

This type of flapping is usually caused by a bad stacking cable or a defective StackWise interface on a switch


http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/troubleshooting/switch_stacks.html



HTH

Reza

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