Depending on the Polycom model, you should be able to use LLDP to assign the VLAN ID... I would search through Polycom documentation and verify their LLDP support and then read through the LLDP section of the EXOS user guide.
Just to chime in here... I have a setup with a X450e connected to a Sonic NSA 220 running SonicOS 5.8.1.14-48o. I have the interfaces set to auto negotiate everything; speed and duplex... Both sides sync up at 1000/Full and appear error free and spee...
you have to create the policy with:
edit policy pbr (policy name)
that will open a vi editor
http://gtacknowledge.extremenetworks.com/articles/How_To/How-to-create-and-apply-an-ACL-in-EXOS/?q=exos+acl&l=en_US&fs=Search&pn=1
If you use just the host (/32) as the source the other IPs will not match that ACL, so you don't have to worry about them. But, if that customer server needs to access anything on your hub network that is outside of its local subnet, the policy will ...
