Hardware loopback, Hardware loopback example: link ok event, Hardware loop example: link not ok event – Dell POWEREDGE M1000E User Manual
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Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
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Chapter 6 Managing Switch Stacks
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
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
0000000011 1 FF08FF00 860302A5 AA55FFFF FFFFFFFF 1CE61CE6 Yes/Yes No cable
0000000011 2 FF08FF00 86031805 55AAFFFF FFFFFFFF 1CE61CE6 Yes/Yes No cable
Event type: LINK OK Stack Port 2
0000000012 1 FF08FF00 860302A5 AA55FFFF FFFFFFFF 1CE61CE6 Yes/Yes No cable
0000000012 2 FF08FF00 86031805 55AAFFFF FFFFFFFF 1CE61CE6 Yes/Yes No cable
Event type: RAC
0000000013 1 FF08FF00 860302A5 AA55FFFF FFFFFFFF 1CE61CE6 Yes/Yes No cable
0000000013 2 FF08FF00 86031805 55AAFFFF FFFFFFFF 1CE61CE6 Yes/Yes No cable
On a member,
•
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.
Hardware Loopback Example: LINK OK event
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
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