STP: TROUBLESHOOTING: LOGS GIVEN


LIVE SCENARIO: TROUBLESHOOTING

GIVEN

Output from Layer 2 switch

Issue: Gi0/28 is down

Gi0/28 is the uplink port

LOGS

Oct 31 23:27:42.640: %SPANTREE-2-UNBLOCK_CONSIST_PORT: Unblocking GigabitEthernet0/28 on VLAN0605. Port consistency restored.

Nov 4 10:07:32.508: %SPANTREE-2-LOOPGUARD_BLOCK: Loop guard blocking port GigabitEthernet0/28 on VLAN0303.

Nov 4 10:07:33.121: %DTP-5-NONTRUNKPORTON: Port Gi0/28 has become non-trunk

Nov 4 10:07:33.599: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/28, changed state to down

Nov 4 10:07:34.622: %LINK-3-UPDOWN: Interface GigabitEthernet0/28, changed state to down

Nov 19 06:49:14.190: %LINK-5-CHANGED: Interface GigabitEthernet0/28, changed state to administratively down

Nov 19 06:49:16.673: %LINK-3-UPDOWN: Interface GigabitEthernet0/28, changed state to down

switchlayer2#       sh int des | i 0/28

Gi0/28                         down           down

switchlayer2#sh running-config int gi0/28
Building configuration…

Current configuration : 337 bytes
!
interface GigabitEthernet0/28
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
logging event trunk-status
udld port aggressive
spanning-tree portfast disable
spanning-tree bpdufilter disable
spanning-tree bpduguard disable
spanning-tree link-type point-to-point
spanning-tree guard loop
end

TASK

We need to make out picture in terms of STP mechanism, to find out what might have happened ?

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