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AppleTalk Routing Protocols 263
Configuring Cable Ranges
When multiple routers are connected to the same network, they may all be configured as a seed
router with the same network range and zone name information. A router may start up as a
nonseed and obtain configuration information from other routers that are already running.
When they are running, there is no practical difference between a seed and a nonseed router.
The following list explains the different ways an Apple router can be configured:
·
Hard seed--The router configures the cable range without regard for the ranges used by
other nodes. Hard seed can cause conflicts and should be used only during
troubleshooting.
A hard seed router can be configured with the local zone and local network
information to be used when it starts up on the network segment to which it will
be attached. A seed router maintains this configuration information even if it is
in conflict with other routers on the same segment.
·
Soft seed--This method is recommended for LAN networks. The router accepts a
different cable range if AppleTalk discovery is enabled. The router disables the interface
if it discovers a conflict.
A soft seed configured with the local zone and local network information works
almost like a hard seed router, with one significant difference. The difference
between the hard seed and the soft seed router occurs at startup. When the soft seed
router starts up, it also acquires the local zone and local network information from
other routers attached to the same network. If the seeded information is in conflict
with the acquired information, the soft seed router uses the acquired information
rather than cause configuration problems on the network.
·
Nonseed--The router receives the configuration from a seed router. A nonseed router
acquires its local zone and local network information from other routers attached to the
same network segment. For a nonseed router to acquire its network configuration properly,
at least one other router running on that network segment must have the proper
configuration information.
AppleTalk Routing Protocols
AppleTalk uses several dynamic routing protocols: RTMP, EIGRP, and AURP. This section
discusses these protocols and provides information to help you determine the best protocol for
each situation and circumstance.
NOTE
Floating static routes, although available for use as a backup route, are not recommended as an
option. Use floating static routes only as a last resort.
87200333.book Page 263 Wednesday, August 22, 2001 2:37 PM