1/1 OK 2 50 cm Yes Yes Yes 0 No 1/2 OK 2 50 cm Yes Yes Yes 0 No 2/1 OK 1 50 cm Yes Yes Yes 0 No 2/2 OK 1 50 cm Yes Yes Yes 0 No If you disconnect the cable from Port 2 on Switch 1, these messages appear: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state DOWN %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state DOWN This is now the port status:
# show switch stack-ports summary # Sw#/Port# Port Neighbor Cable Link Link Sync #Changes In Status Length OK Active OK To LinkOK Loopback -------- ------ -------- -------- ---- ------ ---- --------- -------- 1/1 OK 2 50 cm Yes Yes Yes 1 No 1/2 Absent None No cable No No No 2 No 2/1 Down None 50 cm No No No 2 No 2/2 OK 1 50 cm Yes Yes Yes 1 No Only one end of the cable connects to a stack port, Port 1 on Switch 2. • The Stack Port Status value for Port 2 on Switch 1 is Absent , and the value for Port 1 on Switch 2 is Down . • The Cable Length value is No cable . Diagnosing the problem: • Verify the cable connection for Port 2 on Switch 1.
• Port 2 on Switch 1 has a port or cable problem if • The In Loopback value is Yes . or • The Link OK , Link Active , or Sync OK value is No . Fixing a Bad Connection Between Stack Ports: Example Stack cables connect all members. Port 2 on Switch 1 connects to Port 1 on Switch 2. This is the port status: # show switch stack-ports summary # Sw#/Port# Port Neighbor Cable Link Link Sync #Changes In Status Length OK Active OK To LinkOK Loopback -------- ------ -------- -------- ---- ------ ---- --------- -------- 1/1 OK 2 50 cm Yes Yes Yes 1 No 1/2 Down None 50 cm No No No 2 No 2/1 Down None 50 cm No No No 2 No Managing Switch Stacks Fixing a Bad Connection Between Stack Ports:
Example Managing Switch Stacks 21