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.
