Understanding The Show Switch Stack-Ports Summary Output - Cisco Catalyst 2975 Software Configuration Manual

Troubleshooting Stacks
Powering on Switch 4 before enabling the Port 1 on Switch 1 might cause one of the switches to reload.
Caution
If Switch 4 is powered on first, you might need to enter the switch 1 stack port 1 enable and the switch
4 stack port 2 enable privileged EXEC commands to bring up the link.

Understanding the show switch stack-ports summary Output

Only Port 1 on stack member 2 is disabled.
Switch# show switch stack-ports summary
Switch#/
Port#
--------
1/1
1/2
2/1
2/2
3/1
3/2
Table 6-5
Field
Switch#/Port#
Stack Port Status
Neighbor
Cable Length
Link OK
Link Active
Sync OK
Catalyst 2975 Switch Software Configuration Guide
6-24
Stack Neighbor Cable
Port Length
Status
------ -------- --------
OK 3 50 cm
Down None 3 m
Down None 3 m
OK 3 50 cm
OK 2 50 cm
OK 1 50 cm
show switch stack-ports summary Command Output
Description
Member number and its stack port number.
Absent—No cable is detected on the stack port.
•
Down—A cable is detected, but either no connected neighbor is up,
•
or the stack port is disabled.
OK—A cable is detected, and the connected neighbor is up.
•
Switch number of the active member at the other end of the stack cable.
Valid lengths are 50 cm, 1 m, or 3 m.
If the switch cannot detect the cable length, the value is no cable. The
cable might not be connected, or the link might be unreliable.
This shows if the link is stable.
The link partner is a stack port on a neighbor switch.
• No—The link partner receives invalid protocol messages from the
port.
Yes—The link partner receives valid protocol messages from the
•
port.
This shows if the stack port is in the same state as its link partner.
• No—The port cannot send traffic to the link partner.
• Yes—The port can send traffic to the link partner.
No—The link partner does not send valid protocol messages to the
•
stack port.
Yes—The link partner sends valid protocol messages to the port.
•
Link Link Sync
OK Active OK Changes
To LinkOK
---- ------ ---- ---------
Yes Yes Yes
Yes No Yes
Yes No Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Chapter 6 Managing Switch Stacks
# In
Loopback
--------
1 No
1 No
1 No
1 No
1 No
1 No
OL-19720-02