Avaya Configuring AppleTalk Services Instrukcja Użytkownika Strona 44

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Configuring AppleTalk Services
2-6 117366-A Rev. A
You must configure the interface as a seed router interface if it is the only
AppleTalk router on the network. If a seed router already is configured on this
network, you can configure this interface to be a nonseed router.
Chapter 3 describes how to initially configure a seed router interface. To edit an
AppleTalk interface you have already configured, see “Editing AppleTalk
Interface Parameters” in Chapter 4.
Specifying Interface Costs
You can assign a relative cost value to AppleTalk interfaces. When you specify a
cost, the router adds it to the routes that the interface learns via RTMP data
packets.
Since the AppleTalk router always chooses the least-cost (most direct) path to a
destination, you can limit the use of an interface by assigning it a high cost.
F
igure 2-3 demonstrates how interface cost affects the router’s decision-making
process.
In Example 1, when no cost values are assigned to any of the AppleTalk
interfaces, Router A always reaches Network 4-4 directly through Router C
(because it advertises the least costly route).
As shown in Example 2, if an interface cost of 2 is assigned to Interface 3.1
(which increases the advertised hop count by 2), Router A now reaches Network
4-4 through Router B, because it advertises a lower cost route.
For instructions on how to set the Cost parameter for an interface, see the section
“Editing AppleTalk Interface Parameters” in Chapter 4.
Note: The AppleTalk router does not route to networks that are more than 15
network hops away. Thus, when you assign an interface cost, make certain that
the actual hop count, plus the interface cost you assign, does not exceed the
15-hop restriction.
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