Fixing A Bad Connection Between Stack Ports - Cisco Catalyst 3750-E Software Configuration Manual

Chapter 5 Managing Switch Stacks
Switch#/
Port#
--------
1/1
1/2
2/1
2/2
Only one end of the cable connects to a stack port, Port 1 on Switch 2.
•
•
Diagnosing the problem:
•
•

Fixing a Bad Connection Between Stack Ports

Stack cables connect all members. Port 2 on Switch 1 connects to Port 1 on Switch 2.
This is the port status:
Switch# show switch stack-ports summary
Switch#/
Port#
--------
1/1
1/2
2/1
2/2
Diagnosing the problem:
•
•
•
The connection between Port 2 on Switch 1 and Port 1 on Switch 2 is unreliable on at least one of the
connector pins.
OL-9775-08
Stack Neighbor
Port
Status
------ --------
OK 2
Absent None
Down None
OK 1
The Stack Port Status value for Port 2 on Switch 1 is Absent, and the value for Port 1 on Switch 2 is
Down.
The Cable Length value is No cable.
Verify the cable connection for Port 2 on Switch 1.
Port 2 on Switch 1 has a port or cable problem if
The In Loopback value is Yes.
–
or
The Link OK, Link Active, or Sync OK value is No.
–
Stack Neighbor
Port
Status
------ --------
OK 2
Down None
Down None
OK 1
The Stack Port Status value is Down.
Link OK, Link Active, and Sync OK values are No.
The Cable Length value is 50 cm. The switch detects and correctly identifies the cable.
Cable Link Link
Length OK Active
-------- ---- ------
50 cm Yes Yes
No cable No No
50 cm No No
50 cm Yes Yes
Cable Link Link
Length OK Active
-------- ---- ------
50 cm Yes Yes
50 cm No No
50 cm No No
50 cm Yes Yes
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
Troubleshooting Stacks
Sync # In
OK Changes Loopback
To LinkOK
---- --------- --------
Yes 1 No
No 2 No
No 2 No
Yes 1 No
Sync # In
OK Changes Loopback
To LinkOK
---- --------- --------
Yes 1 No
No 2 No
No 2 No
Yes 1 No
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