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.