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AppleTalk Implementation Notes

2-11

• 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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Avaya Configuring AppleTalk Services Manual de usuario Pagina 51