LINK-3-UPDOWN vs. LINK-SP-3-UPDOWN 1

[jeffbrownell]

Dec 21 21:20:14: %LINK-3-UPDOWN: Interface TenGigabitEthernet1/3, changed state to up
Dec 21 21:20:14: %LINK-SP-3-UPDOWN: Interface TenGigabitEthernet1/3, changed state to up
Dec 21 21:20:14: %LINEPROTO-5-UPDOWN: Line protocol on Interface TenGigabitEthernet1/3, changed state to up
Dec 21 21:20:14: %LINEPROTO-SP-5-UPDOWN: Line protocol on Interface TenGigabitEthernet1/3, changed state to up

Every state change from up/down to down/up logs both a "LINK..." and a "LINK-SP..." message. Why?

 

[vipergg]

I think one is the phsical link updown and the other is the spanning tree state change for that link (SP) .