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
