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VLAN NOT WORKING PROPERLY

Hi ,

     I have two 3750 switch and one of them is core switch.The core switch is configured 14 VLAN.the 2nd l3 switch is connected with core switch by trunk mode.My all VLAN is working properly except VLAN 4.The problem is VLAN 4 it goes down and after 30/40 second it goes up.I tried but can't find out the problem so please help me out of this problem.

PPCL IS MY CORE SWITCH

i have attached my current config.

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