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GVRP blocks switch?

I am new to networking.When I try to connect a 3512-XL-EN switch to a simple layer-2 switch(no setting at all,p&p switch),the connection to WAN is kind of cut off.I can only receive GVRP,ISMP.EDP,LLDP and CDP packages and nothing else.(sniffer on a computer connected to the SimpleSwitch)

WAN---SimpleSwitch---3512 (all FE connection)

62 62.375859 Enterasy_34:81:f5 Ieee8021_00:00:21 GVRP GVRP

63 63.514332 Enterasy_34:81:f5 LLDP_Multicast LLDP Chassis Id = 00:11:88:34:81:e4 Port Id = fe.1.16 TTL = 120

68 72.376113 Enterasy_34:81:f5 Ieee8021_00:00:21 GVRP GVRP

79 82.376203 Enterasy_34:81:f5 Ieee8021_00:00:21 GVRP GVRP

89 92.376231 Enterasy_34:81:f5 Ieee8021_00:00:21 GVRP GVRP

90 93.514717 Enterasy_34:81:f5 Cabletron-PC-OV-PC-discover-(on-demand) ISMP.EDP MIP 10.20.76.10, MMAC 00:11:88:34:81:e4, ifIdx 11016

91 93.514732 Enterasy_34:81:f5 LLDP_Multicast LLDP Chassis Id = 00:11:88:34:81:e4 Port Id = fe.1.16 TTL = 120

92 93.514796 Enterasy_34:81:f5 CDP/VTP/DTP/PAgP/UDLD CDP Device ID: 0011883481e4  Port ID: fe.1.16 

When a 3620 router instead of a 3512 switch is connected,it's fine   but as soon as the switch is connected   the wan connection is cut off

I suppose it is kinda network management measure or inappropriate setting in STP or GVRP?

I want some easy explanation,thanks

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