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MVR and SAP announcements

Hi ppl,

When i enable MVR on a cisco 3750 switch i seem to loose all SAP announcements.

EG with mvr:

mvr vlan 501
mvr mode dynamic

switchport access vlan 4
switchport trunk encapsulation dot1q
switchport trunk native vlan 501
switchport mode access
switchport voice vlan 5
mvr type receiver
mvr immediate
spanning-tree portfast

No sap at all on the vlan 501

if i let the port direcly acess vlan 501 i do see SAP announcements on the port. Do you guys have any idea where to start to search what kills SAP in mvr mode?

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