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AppleTalk Overview
117366-A Rev. A 1-11
Zone Information Protocol (ZIP)
The Bay Networks AppleTalk router uses the Zone Information Protocol (ZIP) to
map networks to zone names on the internet. The router stores this information in
its zone information table, also called a zone list. The zone information table
contains one entry for each network on the internet. The entry is in the format
<network_start, zone list>
The zone list field consists of a number of text strings that identify the zone names
that are specified for that network. The router maintains and updates the zone list
by broadcasting ZIP Query packets for zone list information to all other routers in
the network. Other routers respond with ZIP response packets that have the zone
lists (F
igure 1-6).
Figure 1-6. ZIP Response Packets
Function = 1
Network Count
Function = 2(Reply)
8 (Extended Reply)
Network 1
Length of Zone Name 1
Zone Name 1
Length of Zone Name 2
Zone Name 2
Network 1
Network 2
Network 2
Network Count
ZIP Query ZIP Reply
APT0006A
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