3Com 4007, Implementation Manual, Page: 547 / 684

Key Implementation Guidelines
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Phase 1 network — An AppleTalk network that contains a single
network number (such as network 2). Also known as non-extended
networks , Phase 1 networks do not allow two nodes on a single
network segment to belong to different zones.
■
Phase 2 network — An AppleTalk network that contains multiple
consecutive network numbers (such as network 3–20). Also known as
extended networks
, Phase 2 networks can also contain a single
network number (such as network 3–3).
■
AppleTalk Address Resolution Protocol (AARP) — An AppleTalk
support protocol that maps the hardware address of an AppleTalk
node to an AppleTalk protocol address.
■
Hop Count — The number of routers that a packet must cross to
reach a destination network.
■
AppleTalk Echo Protocol (AEP) — An AppleTalk support protocol
used to test the accessibility of a system and make an estimate of the
route-trip transmission time that is required to reach the system.
■
Checksum — A method providing error detection for AppleTalk
packets, calculated by summing a set of values.
Key
Implementation
Guidelines
Consider the following guidelines when designing a dependable and
scalable AppleTalk network:
■
All AppleTalk routers on the same network segment must have the
same configuration. Therefore, all seed routers must be configured
with matching:
■
Network ranges
■
Default zones
■
Zone lists
If a configuration mismatch occurs between routers on the same
segment, then unpredictable behavior may result. For example, zones
may fail to appear in Chooser, and AppleTalk services may become
inaccessible.
■
If you are connecting your system’s AppleTalk Phase 2 routing
interface to an AppleTalk Phase 1 network, follow these guidelines:
■
Specify a network range of 1 (for example,
22-22
).
■
The network can belong to only one zone.