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ERSPAN source from VLAN

I have a 3750, a switch port with "switchport access vlan 999". the 3750 is connected to a 7609 via GigE1/0/28 interface configured with "switchport trunk allowed vlan 2,20,21,999".

I am then trying to source VLAN 999 on the 7609, and it's not working.

g1/0/28 is physically connected to g3/20.

"switchport trunk allowed vlan 999" on both the switch's port g1/0/28 and the 7609's g3/20

I can source any other VLAN configured on the 7609 and it works.

If i source VLAN 999 it fails, no traffic on the destination.

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