Novell NETWARE 6-DOCUMENTATION Manual page 1883

AppleTalk Routing Information Filters over AURP
Source Route Bridge Filtering
Protocol ID Filters
Ring Number Filters
route information designated in the filters received from the specified
neighbors, but accepts and records all other routing information. If the
specified action is to permit routes in the filter list, the router accepts only
routes designated in the filter list from the named neighbors and ignores
everything else.
Routing information filters configured for AURP routers affect all AURP
routers on the tunnel in the same way. AppleTalk routers running AURP
cannot filter routes on a per-router basis.
WARNING:
You should not change AURP route filters dynamically unless it is
absolutely required. Because AURP routers exchange complete route information
only during connection setup and only send updates to the information thereafter,
changing route filters can cause large volumes of AURP routing information to be
exchanged as the routers adapt to the new filter configuration. During this
information exchange, connectivity over the tunnel can be affected.
Source route bridge supports the following two types of filters:
Protocol ID filters
Ring number filters
Protocol ID filters filter out packets of certain protocol types received by the
source route bridge. Protocol ID filtering can help control traffic, balance
bridge loads, and increase security.
Ring number filters filter out packets received from specific rings in a token
ring network. This lets you limit the traffic that crosses a bridge from a source.
Use ring number filters to balance the load among your network bridges and
to increase network security.
23
Understanding