06-14-2013 07:48 PM - edited 03-07-2019 01:54 PM
Hi guys,
Need some advice.
I keep getting link flaps on my stack. Not sure where is the issue.
Powered down and checked all cables and connectivity but issue still there.
Switch # Port 1 Port 2
-------- ------ ------
1 Ok Ok
2 Down Ok
3 Ok Down
4 Ok Ok
5 Ok Ok
Here is the stack-port summary captured within few minutes.
Switch#/ Stack Neighbor Cable Link Link Sync # In
Port# Port Length OK Active OK Changes Loopback
Status To LinkOK
-------- ------ -------- -------- ---- ------ ---- --------- --------
1/1 OK 2 50 cm Yes Yes Yes 1 No
1/2 OK 5 1 m Yes Yes Yes 3 No
2/1 Down None 50 cm Yes No Yes 2367 No
2/2 OK 1 50 cm Yes Yes Yes 1 No
3/1 OK 4 50 cm Yes Yes Yes 1 No
3/2 Down None 50 cm Yes No Yes 0 No
4/1 OK 5 50 cm Yes Yes Yes 2 No
4/2 OK 3 50 cm Yes Yes Yes 1 No
5/1 OK 1 1 m Yes Yes Yes 1 No
5/2 OK 4 50 cm Yes Yes Yes 1 No
Switch#/ Stack Neighbor Cable Link Link Sync # In
Port# Port Length OK Active OK Changes Loopback
Status To LinkOK
-------- ------ -------- -------- ---- ------ ---- --------- --------
1/1 OK 2 50 cm Yes Yes Yes 1 No
1/2 OK 5 1 m Yes Yes Yes 3 No
2/1 Down None 50 cm Yes No Yes 2367 No
2/2 OK 1 50 cm Yes Yes Yes 1 No
3/1 OK 4 50 cm Yes Yes Yes 1 No
3/2 Down None 50 cm Yes No Yes 0 No
4/1 OK 5 50 cm Yes Yes Yes 2 No
4/2 OK 3 50 cm Yes Yes Yes 1 No
5/1 OK None 1 m Yes Yes Yes 1 No
5/2 OK None 50 cm Yes Yes Yes 1 No
Switch#/ Stack Neighbor Cable Link Link Sync # In
Port# Port Length OK Active OK Changes Loopback
Status To LinkOK
-------- ------ -------- -------- ---- ------ ---- --------- --------
1/1 OK None 50 cm Yes Yes Yes 1 No
1/2 OK None 1 m Yes Yes Yes 3 No
2/1 Down None 50 cm Yes No Yes 2367 No
2/2 OK 1 50 cm Yes Yes Yes 1 No
3/1 OK 4 50 cm Yes Yes Yes 1 No
3/2 Down None 50 cm Yes No Yes 0 No
4/1 OK 5 50 cm Yes Yes Yes 2 No
4/2 OK None 50 cm Yes Yes Yes 1 No
5/1 OK None 1 m Yes Yes Yes 1 No
5/2 OK None 50 cm Yes Yes Yes 1 No
Switch#/ Stack Neighbor Cable Link Link Sync # In
Port# Port Length OK Active OK Changes Loopback
Status To LinkOK
-------- ------ -------- -------- ---- ------ ---- --------- --------
1/1 OK 2 50 cm Yes Yes Yes 1 No
1/2 OK 5 1 m Yes Yes Yes 3 No
2/1 Down None 50 cm Yes No Yes 2367 No
2/2 OK 1 50 cm Yes Yes Yes 1 No
3/1 OK 4 50 cm Yes Yes Yes 1 No
3/2 Down None 50 cm Yes No Yes 0 No
4/1 OK 5 50 cm Yes Yes Yes 2 No
4/2 OK 3 50 cm Yes Yes Yes 1 No
5/1 OK 1 1 m Yes Yes Yes 1 No
5/2 OK 4 50 cm Yes Yes Yes 1 No
06-14-2013 08:04 PM
Can you post the output to the command "PID: WS-C3750"?
06-14-2013 08:16 PM
Command not accepted. You mean the sh inventory?
NAME: "1", DESCR: "WS-C3750-48P"
PID: WS-C3750-48PS-S , VID: V06 , SN: xxxxxxx
NAME: "GigabitEthernet1/0/1", DESCR: "1000BaseSX SFP"
PID: Unspecified , VID: , SN: xxxxxxxx
NAME: "2", DESCR: "WS-C3750-48P"
PID: WS-C3750-48PS-S , VID: V06 , SN: xxxxxxx
NAME: "3", DESCR: "WS-C3750-48P"
PID: WS-C3750-48PS-S , VID: N/A , SN: xxxxxxx
NAME: "4", DESCR: "WS-C3750-48P"
PID: WS-C3750-48PS-S , VID: V06 , SN: xxxxxx
NAME: "5", DESCR: "WS-C3750V2-48PS"
PID: WS-C3750V2-48PS-S , VID: V06 , SN: xxxxx
NAME: "GigabitEthernet5/0/1", DESCR: "1000BaseSX SFP"
PID: Unspecified , VID: , SN: xxxxxx
06-14-2013 08:32 PM
Hi,
You may have a bad stacking cable or a bad interface on one of the switches.
Have a look at this doc for troubleshooting tips:
HTH
06-14-2013 08:55 PM
Very nice.
How the heck am I suppose to help you if you block out the serial number???? The information I seek, whether or not your switch is part of the Field Notice, can be found in the first seven characters.
If you want to block them out, block out the last four characters.
06-14-2013 08:08 PM
Some more info:
Switch#/ Lost Sync # times Link # Changes
Port# Events Not OK To LinkOK
--------- ----------- ------------ ----------
1/1 0 0 1
1/2 0 2 3
2/1 0 2367 2367
2/2 0 0 1
3/1 0 0 1
3/2 0 0 0
4/1 0 1 2
4/2 0 0 1
5/1 0 0 1
5/2 0 0 1
Switch# sh switch stack-ring speed
Stack Ring Speed : 16G
Stack Ring Configuration: Half
Stack Ring Protocol : StackWise
06-14-2013 09:00 PM
06-15-2013 12:53 AM
Thanks Leo. I checked the document and my devices do not fall in those groups.
06-15-2013 01:14 AM
Jagan,
Kindly try changing the Cables now .
Whats the firmware its running?
Regards
Inayath
06-28-2013 02:58 AM
Thanks Inayath,
Tried changing the cable but still the same. In the end got the switch replaced and the stack is stable now.
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