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Catalyst 3750 SwitchSoftware Configuration Guide
OL-8550-09
Chapter5 Managing Switch Stacks
Troubleshooting Stacks

On a Catalyst 3750-E switch:

Switch# show platform stack ports buffer
Stack Debug Event Data Trace
==============================================================
Event type LINK: Link status change
Event type RAC: RAC changes to Not OK
Event type SYNC: Sync changes to Not OK
==============================================================
Event Stack Stack PCS Info Ctrl-Status Loopback Cable
Count Port IOS / HW length
========= ===== =================================== =========== ======== ========
Event type: LINK OK Stack Port 1
0000000153 1 FF01FF00 860351A5 55A5FFFF FFFFFFFF 0CE60C10 No /No 50 cm
0000000153 2 FF01FF00 00017C07 00000000 0000FFFF 0CE60C10 No /No 3 m
Event type: RAC
0000000154 1 FF01FF00 860351A5 55A5FFFF FFFFFFFF 0CE60C10 No /No 50 cm
0000000154 2 FF01FF00 00017C85 00000000 0000FFFF 0CE60C10 No /No 3 m
Hardware Loop Example: LINK NOT OK Event

On a Catalyst 3750 switch:

Switch# show platform stack ports buffer
Stack Debug Event Data Trace
==============================================================
Event type LINK: Link status change
Event type RAC: RAC changes to Not OK
Event type SYNC: Sync changes to Not OK
==============================================================
Event Stack Stack PCS Info Ctrl-Status Loopback Cable
Count Port IOS / HW length
========= ===== =================================== =========== ======== ========
Event type: LINK OK Stack Port 2
0000000005 1 FF08FF00 0001FBD3 0801080B EFFFFFFF 0C100CE6 No /No No cable
0000000005 2 FF08FF00 8603E4A9 5555FFFF FFFFFFFF 0C100CE6 No /No 50 cm
Event type: RAC
0000000006 1 FF08FF00 0001FC14 08050204 EFFFFFFF 0C100CE6 No /No No cable
0000000006 2 FF08FF00 8603E4A9 5555FFFF FFFFFFFF 0C100CE6 No /No 50 cm
Event type: LINK NOT OK Stack Port 2
0000000939 1 FF08FF00 00016879 00010000 EFFFFFFF 0C100C14 No /No No cable
0000000939 2 FF08FF00 0001901F 00000000 FFFFFFFF 0C100C14 No /No No cable
Event type: RAC
0000000940 1 FF08FF00 000168BA 00010001 EFFFFFFF 0C100C14 No /No No cable
0000000940 2 FF08FF00 0001905F 00000000 FFFFFFFF 0C100C14 No /No No cable
Event type: LINK OK Stack Port 1
0000000956 1 FF08FF00 86034DAC 5555FFFF FFFFFFFF 1CE61CE6 Yes/Yes No cable
0000000956 2 FF08FF00 86033431 55AAFFFF FFFFFFFF 1CE61CE6 Yes/Yes No cable
Event type: LINK OK Stack Port 2
0000000957 1 FF08FF00 86034DAC 5555FFFF FFFFFFFF 1CE61CE6 Yes/Yes No cable
0000000957 2 FF08FF00 86033431 55AAFFFF FFFFFFFF 1CE61CE6 Yes/Yes No cable
Event type: RAC
0000000958 1 FF08FF00 86034DAC 5555FFFF FFFFFFFF 1CE61CE6 Yes/Yes No cable
0000000958 2 FF08FF00 86033431 55AAFFFF FFFFFFFF 1CE61CE6 Yes/Yes No cable