Cisco :: 3750 Switch - Connectivity Lost For Some Ports?

Mar 8, 2013

In my 3750 stack switch there are more than 10 L3 vlans currently in use.In that only one vlan for example vlan 11 (we given up link directly to the nodes connected to that ports which is in vlan 11)losing connectivity for sometime and again connectivity restored.Except Vlan 11 all other vlans are working fine. When we troubleshooted the issue some of the ip's able to ping and some not able to ping. checked the interface status of that ports (no crc and input errors) and port is in up status only.we also checked cpu utlilisation ,device uptime, all are no issues found. am sharing my sw basic config and one interface status at the time of issue.But only one port learning more than 50 Mac-Addresses dynamically.and am learning mac address violation in another port which is port security and storm control enabled on that port..Its seems to be any attack or something else????

interface GigabitEthernet1/0/20
--More-- description
switchport access vlan 11
switchport mode access
spanning-tree portfast
logs:
Mar 8 05:58:25.848 IST: %PORT_SECURITY-2-PSECURE_VIOLATION: Security violation occurred, caused by MAC address 0026.0a18.8218 on port GigabitEthernet1/0/16.
Mar 8 05:59:25.862 IST: %PORT_SECURITY-2-PSECURE_VIOLATION: Security violation occurred, caused by MAC address 0026.0a18.8218 on port GigabitEthernet1/0/16.

AT the time of issue interface status:

sh int gi2/0/14
GigabitEthernet2/0/14 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 0026.ca46.5c8e (bia 0026.ca46.5c8e)
Description:
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,[code]......

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