Hardware Loopback Example: Link Ok Event - Cisco Catalyst 3750-E Software Configuration Manual

Troubleshooting Stacks
Hardware Loopback
The show platform stack ports buffer privileged EXEC command output shows the hardware loopback
values.
Switch# show platform stack ports buffer
==============================================================
Event type LINK: Link status change
Event type RAC: RAC changes to Not OK
Event type SYNC: Sync changes to Not OK
==============================================================
Event
Count
=========
Event type: LINK OK Stack Port 1
0000000011
0000000011
Event type: LINK OK Stack Port 2
0000000012
0000000012
Event type: RAC
0000000013
0000000013
On a Catalyst 3750 member,
•
•
On a Catalyst 3750-E or Catalyst 3750-X member,
•
•

Hardware Loopback Example: LINK OK event

On a Catalyst 3750 switch:
Switch# show platform stack ports buffer
==============================================================
Event type LINK: Link status change
Event type RAC: RAC changes to Not OK
Event type SYNC: Sync changes to Not OK
==============================================================
Event
Count
=========
Event type: LINK OK Stack Port 1
0000000008
0000000008
Event type: RAC
0000000009
0000000009
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
5-30
Stack Debug Event Data Trace
Stack
Port
===== ===================================
1 FF08FF00 860302A5 AA55FFFF FFFFFFFF
2 FF08FF00 86031805 55AAFFFF FFFFFFFF
1 FF08FF00 860302A5 AA55FFFF FFFFFFFF
2 FF08FF00 86031805 55AAFFFF FFFFFFFF
1 FF08FF00 860302A5 AA55FFFF FFFFFFFF
2 FF08FF00 86031805 55AAFFFF FFFFFFFF
If at least one stack port has an connected stack cable, the Loopback HW value for both stack ports
is No.
If neither stack port has an connected stack cable, the Loopback HW value for both stack ports is Yes.
If a stack port has an connected stack cable, the Loopback HW value for the stack port is No.
If the stack port does not have an connected stack cable, the Loopback HW value for the stack port
is Yes.
Stack Debug Event Data Trace
Stack
Port
===== ===================================
1 FF08FF00 8603F083 55AAFFFF FFFFFFFF
2 FF08FF00 0001DBDF 01000B00 FFFFFFFF
1 FF08FF00 8603F083 55AAFFFF FFFFFFFF
2 FF08FF00 0001DC1F 02000100 FFFFFFFF
Stack PCS Info
Stack PCS Info
Chapter 5 Managing Switch Stacks
Ctrl-Status Loopback
IOS / HW
=========== ========
1CE61CE6 Yes/Yes
1CE61CE6 Yes/Yes
1CE61CE6 Yes/Yes
1CE61CE6 Yes/Yes
1CE61CE6 Yes/Yes
1CE61CE6 Yes/Yes
Ctrl-Status Loopback
IOS / HW
=========== ========
0CE60C10 No /No
0CE60C10 No /No
0CE60C10 No /No
0CE60C10 No /No
Cable
length
========
No cable
No cable
No cable
No cable
No cable
No cable
Cable
length
========
50 cm
No cable
50 cm
No cable
OL-9775-08