Allied Telesis AT-WA7501 - Manual (Page 158)

Chapter 5: Configuring the Spanning Tree
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For this example, set these options on the Ethernet Frame Type Filters
screen. No subtype filters are needed.
Example 2
AP2 and AP4 (designated bridge) service end devices and the IP host and
IPX host on the secondary LAN. Also, these access points pass IPX
traffic.
The IPX router in this network periodically sends IPX RIP frames for
coordinating with other routers. These do not need to be forwarded to the
secondary LAN, because the secondary LAN does not contain a router.
To filter the IPX RIP frames, you need to configure subtype filters. This
example sets filters for three different cases: DIX, 802.2, and 802.3 SNAP
frames. In many actual networks, only one type of filter is required,
because all stations are configured using one of the three options.