
AppleTalk Implementation Notes
117366-A Rev. A 2-15
Zone Filter Rules for the Exclude Option
Rule 1. The AppleTalk router always advertises its own network information.
For example, if the zone filter list shown in F
igure 2-7 for Interface 3.1 were
expanded to include the Engineering zone, the router would still advertise zone
and network information about Network 3-3 through Interface 3.1 in response to a
GetZoneList or GetLocalZones command.
Figure 2-7. AppleTalk Zone Filters with the Exclude Option: Rule 1
Rule 2. The AppleTalk router always advertises the network information it learns
on an interface back out that interface. The AppleTalk router advertises all zone
information in response to a GetLocalZones Reply request. The router applies
zone filters to corresponding network information in RTMP data packets, ZIP
replies, GetZoneList replies, and NBP forward requests.
1-1
Finance Zone
A Zone
B Zone
2-2
Human Resources Zone
3-3
Engineering Zone
4-4
Sales Zone
3-1
Filter
Exclude Zone Filter List Networks Filtered Networks not Filtered
Finance
1-1
3-3 due to Rule 1
APT0017A
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