Software Loopback Example: No Connected Stack Cable; Software Loopback Examples: Connected Stack Cables - Cisco Catalyst 3750-X Software Configuration Manual

Chapter 5 Managing Switch Stacks
Switch#/
Port#
--------
1/1
1/2

Software Loopback Example: No Connected Stack Cable

Catalyst 3750 switch port status:
Switch# show switch stack-ports summary
Switch#/
Port#
--------
1/1
1/2
Catalyst 3750-E or 3750-X switch port status:
Switch# show switch stack-ports summary
Switch#/
Port#
--------
1/1
1/2

Software Loopback Examples: Connected Stack Cables

•
•
OL-21521-01
Stack Neighbor
Port
Status
------ --------
Absent None
Absent None
Stack Neighbor
Port
Status
------ --------
Absent None
Absent None
Stack Neighbor
Port
Status
------ --------
Absent None
Absent None
On Port 1 on Switch 1, the port status is Down, and a cable is connected.
On Port 2 on Switch 1, the port status is Absent, and no cable is connected.
Switch# show switch stack-ports summary
Switch#/ Stack Neighbor
Port# Port
Status
-------- ------ --------
1/1 Down None
1/2 Absent None
In a physical loopback, a cable connects both stack ports on a switch. You can use this configuration
to test
Cables on a switch that is running properly
–
Stack ports with a cable that works properly
–
Switch# show switch stack-ports summary
Switch#/ Stack Neighbor
Port# Port
Status
-------- ------ --------
2/1 OK 2
2/2 OK 2
The port status shows that
Switch 2 is a standalone switch.
–
The ports can send and receive traffic.
–
Cable Link Link
Length OK Active
-------- ---- ------
No cable No No
No cable No No
Cable Link Link
Length OK Active
-------- ---- ------
No cable Yes No
No cable Yes No
Cable Link Link
Length OK Active
-------- ---- ------
No cable No No
No cable No No
Cable Link Link
Length OK Active
-------- ---- ------
50 Cm No No
No cable No No
Cable Link Link
Length OK Active
-------- ---- ------
50 cm Yes Yes
50 cm Yes Yes
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
Troubleshooting Stacks
Sync # In
OK Changes Loopback
To LinkOK
---- --------- --------
No 1 Yes
No 1 Yes
Sync # In
OK Changes Loopback
To LinkOK
---- --------- --------
Yes 1 Yes
Yes 1 Yes
Sync # In
OK Changes Loopback
To LinkOK
---- --------- --------
No 1 Yes
No 1 Yes
Sync #
OK Changes Loopback
To LinkOK
---- --------- --------
No 1
No 1
Sync #
OK Changes Loopback
To LinkOK
---- --------- --------
Yes 1
Yes 1
In
No
No
In
No
No
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