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A-32 Cisco 2500 Series Access Server User Guide

Desktop Protocols

AppleTalk Network Numbering

AppleTalk uses a 16-bit number to uniquely identify networks. There are two kinds of

AppleTalk networks, extended and nonextended. Extended networks are used for all LANs

and most WANs.

A single network number, such as 200, identiﬁes a nonextended AppleTalk network.

Nonextended networks can have a maximum of 253 nodes and a single zone name. See the

section “AppleTalk Directory Services” later in this appendix for information on zones.

Nonextended networks are rarely used unless they are required for such support as a

Phase 1 Ethernet (which is now obsolete), X.25, or LocalTalk.

Extended networks allow a cable range that consists of one or more network numbers, such

as 200-201, to be deﬁned and used by nodes on that network.

The access server plays no role in routing packets between network numbers in a range as

all the nodes know the full range of numbers that deﬁne the local data link.

Timesaver A good rule of thumb is to have one number in the range for every 50

AppleTalk devices on the LAN. For example, to support 300 devices, use a cable range of

six (such as 201-206).

Figure A-13 shows a sample AppleTalk network numbering and zone naming plan. Zones

are described in the section “AppleTalk Directory Services” later in this appendix.

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