Identifying loopback problems, Software loopback – Dell POWEREDGE M1000E User Manual

Page 172

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6-30

Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide

OL-13270-03

Chapter 6 Managing Switch Stacks

Troubleshooting Stacks

Identifying Loopback Problems

Software Loopback, page 6-30

Software Loopback Example: No Connected Stack Cable, page 6-31

Software Loopback Examples: Connected Stack Cables, page 6-31

Hardware Loopback, page 6-32

Hardware Loopback Example: LINK OK event, page 6-32

Hardware Loop Example: LINK NOT OK Event, page 6-32

Software Loopback

In a stack with three members, stack cables connect all the members.

Switch# show switch stack-ports summary

Switch#/ Stack Neighbor Cable Link Link Sync # In

Port# Port Length OK Active OK Changes Loopback

Status To LinkOK

-------- ------ -------- -------- ---- ------ ---- --------- --------

1/1 OK 3 50 cm Yes Yes Yes 1 No

1/2 OK 2 3 m Yes Yes Yes 1 No

2/1 OK 1 3 m Yes Yes Yes 1 No

2/2 OK 3 50 cm Yes Yes Yes 1 No

3/1 OK 2 50 cm Yes Yes Yes 1 No

3/2 OK 1 50 cm Yes Yes Yes 1 No

If you disconnect the stack cable from Port 1 on Switch 1, these messages appear:

01:09:55: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 3 has changed to state DOWN

01:09:56: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN

Switch# show switch stack-ports summary

Switch#/ Stack Neighbor Cable Link Link Sync # In

Port# Port Length OK Active OK Changes Loopback

Status To LinkOK

-------- ------ -------- -------- ---- ------ ---- --------- --------

1/1 Absent None No cable No No No 1 No

1/2 OK 2 3 m Yes Yes Yes 1 No

2/1 OK 1 3 m Yes Yes Yes 1 No

2/2 OK 3 50 cm Yes Yes Yes 1 No

3/1 OK 2 50 cm Yes Yes Yes 1 No

3/2 Down None 50 cm No No No 1 No

If you disconnect the stack cable from Port 2 on Switch 1, the stack splits.

Switch 2 and Switch 3 are now in a two-member stack connected through stack cables.

Switch# show sw stack-ports summary

Switch#/ Stack Neighbor Cable Link Link Sync # In

Port# Port Length OK Active OK Changes Loopback

Status To LinkOK

-------- ------ -------- -------- ---- ------ ---- --------- --------

2/1 Down None 3 m No No No 1 No

2/2 OK 3 50 cm Yes Yes Yes 1 No

3/1 OK 2 50 cm Yes Yes Yes 1 No

3/2 Down None 50 cm No No No 1 No

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