Logs found as port consistency Restored on switch 3550.

Unanswered Question
Dec 19th, 2011
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Hi,



Please find below logs we found on switch 3550


.Dec 17 19:58:06.193: %SPANTREE-5-TOPOTRAP: Topology Change Trap for vlan 15

.Dec 17 19:58:07.190: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/23, changed state to down

.Dec 17 19:58:07.190: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan20, changed state to down

.Dec 17 19:58:08.198: %LINK-3-UPDOWN: Interface FastEthernet0/23, changed state to down

.Dec 17 19:59:18.671: %SPANTREE-5-TOPOTRAP: Topology Change Trap for vlan 15

.Dec 17 19:59:19.671: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan15, changed state to down

.Dec 17 19:59:21.727: %LINK-3-UPDOWN: Interface FastEthernet0/23, changed state to up

.Dec 17 19:59:23.731: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/23, changed state to up

.Dec 17 19:59:36.104: %SPANTREE-2-UNBLOCK_CONSIST_PORT: Unblocking FastEthernet0/20 on VLAN0015. Port consistency restored.

.Dec 17 19:59:52.732: %SPANTREE-5-TOPOTRAP: Topology Change Trap for vlan 15

.Dec 17 19:59:53.732: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan15, changed state to up

.Dec 17 19:59:53.732: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan20, changed state to up

.Dec 17 20:00:06.104: %SPANTREE-5-TOPOTRAP: Topology Change Trap for vlan 15


on date 17th dec 2011 in the mention logs,  i found suddenly the switch CE-500 (in the given diagram) goes unexpected Reload that time only we observed the above mention logs, i also find-out there is no power traps that time.


i have gone through the cisco documentation relating to type-inconsistency and PVID-inconsistency but i did not found any solution relating to port-inconsistency, help me to get this solution if any where listed. or Please help me to find out the root cause for the same.




configuration relate to Attached Diagram.


3550 config:-

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

# int fa0/20

switchport access vlan 15

switchport mode access


# int fa0/23

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 192,15,20

switchport mode trunk


STP Enable as PVST

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


Same configuration is on port gi1 on CE500 switch

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


Dlink switch 1 config :-

# int fa0/48

vlan allowed 192,20


STP disabled

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


Dlink switch 2 config :-

# int fa0/48

access vlan 15




int Fa0/20 of  3550 is connected to int fa0/48 of D-link

Native Vlan is 1 for all




Thanx for your Support.

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