Avaya Configuring AppleTalk Services Bedienungsanleitung Seite 49

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AppleTalk Implementation Notes
117366-A Rev. A 2-11
How Zone Filters Work
When you configure zone filters on an interface using the Exclude or Include
options, the interface no longer sends out zone or network information about the
filtered zones.
RTMP packets the interface generates do not contain the networks mapped to
the filtered zones.
ZIP GetZoneList response packets the interface sends out do not contain the
filtered zones.
NBP Broadcast Request packets the interface receives for the filtered zones
are not propagated as Forward Request packets or Lookup packets by the
interface.
NBP Response packets are not routed if the source network number is from a
network with a zone that is to be filtered.
When you are using the Exclude or Include options, be aware that if part of a
network’s zone list is filtered on a port, then the entire network is filtered on that
port. Within an AppleTalk network, a router must communicate all zone
information about a network if it knows the network’s associated zone list.
For example, the network administrator for the network shown in F
igure 2-5
wants to impose a security filter that restricts all AppleTalk users, except those in
the Human Resources zone, from accessing the Finance zone. To accomplish this,
the administrator adds the Finance zone to the exclude zone filter list for Interface
3.1.
Note: Communicating a partial zone list for a given network violates the
AppleTalk specification and can result in ZIP storms. ZIP storms occur when a
router receiving conflicting ZIP information from different sources
continuously broadcasts ZIP requests onto locally attached network segments.
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