3Com 4007, Руководство по внедрению, Страница: 520 / 684

520 C
HAPTER
20: IPX R
OUTING
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The maximum number of hops, or routers that a packet can cross, is
16, except for NetBIOS packets, which can cross no more than 7
routers.
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Before you define static routes on your system, you must define at
least one IPX interface.
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Static routes remain in the routing table until you remove them or
until you remove the corresponding interface.
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If an interface goes down, routes are temporarily removed from the
routing table until the interface comes back up.
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Static routes take precedence over dynamically learned routes to the
same destination. You can have a maximum of 32 static routes.
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When you use the
ipx route remove
option to remove a route,
that route is immediately removed. All servers that depend on the
removed route are also removed from the Server Information Table,
including all static servers.
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When you use the
ipx route flush
option to remove dynamically
learned routes from the IPX routing table, all dynamically learned
routes are removed immediately. All dynamic servers that depend on
these routes are also removed from the Server Information Table.
Primary and
Secondary Routes
You can set up both Primary and Secondary routes in the routing table.
To set up routes in the routing table, see the IPX routing chapter in the
Switch 4007 Command Reference Guide .
Static Routes You manually configure a static route. Static routes are useful in
environments in which no routing protocol is used or in which you want
to override a routing protocol’s generated route.
Static routes do not change until you change them, and they do not time
out. Because static routes do not change in response to network
topology changes, manually configure only a small number of reasonably
stable routes.
Dynamic Routes
Using RIP
A router uses RIP to exchange its routing table with other routers at
regular intervals. This automatic method of learning routes helps you
keep up with a changing network environment and allows you to
reconfigure routes quickly and reliably. Interior Gateway Protocols (IGPs),
which operate within intranetworks, provide this automated learning.