Allied Telesis AT-WA7500 - Manual (Page 130)

5 - Configuring the Spanning Tree
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Customizing Subtype Filters
You can define output filters that restrict customized frame subtypes
that can pass through an IP tunnel. Frames can be filtered by the DIX,
802.2, or 802.3 SNAP type, the IP protocol type, or the TCP or UDP port
number. By default, the filters drop all protocol types except the NNL DIX
Ethernet type (hexadecimal 875B). Filters must be configured in all root
candidates and in any access point that can attach to the remote end of
an IP tunnel.
You define the action, subtype, and value parameters in customized
filters:
Allow/ Pass
Check or clear this check box. Check this check box to pass all
frames of the subtype and value. Clear this check box to drop all
frames of the subtype and value.
Subtype
Selects the frame subtype you wish to configure.
Value
The following table describes frame subtypes and their values.
The value must be two hex pairs. When a match is found between
frame subtype and value, the specified action is taken.