Avaya Configuring IP Services Uživatelský manuál stáhnout pdf (Strana 322)

Configuring IP Services

8-6

When you conﬁgure a static name, you must specify its NetBIOS scope — that is,

the area of the network across which the name is known. Each NetBIOS scope has

a Scope Identiﬁer, a string of characters that meet the requirements of the Domain

Name System. (All NetBIOS names are represented in a manner consistent with

the deﬁnition for “compressed name messages” outlined in the Domain Name

Service Speciﬁcation — RFC 833.)

Conﬁguring and Customizing a NetBIOS Cache

NetBIOS is a broadcast-intensive protocol. Much of the broadcast overhead is

related to maintaining unique names across the network and providing end users

with access to NetBIOS applications. The amount of overhead grows with the

number of NetBIOS resources (applications, servers, and clients) on the network.

To keep broadcast trafﬁc to a minimum, each router that runs NetBIOS over IP

builds and maintains a cache of NetBIOS name/IP address pairs, using

information contained in the Name Query Responses it receives and forwards.

In Figure 8-3, for example,

1. Router A receives a Name Query Response from the server. The router gleans

from the Name Query Response the name and IP address of the server.

2. The router stores the name and IP address of the server in its cache.

3. The router forwards the Name Query Response.

Routers that support NetBIOS must analyze each Name Query Request received

on a NetBIOS interface to determine whether the name of the requested resource

(typically, a server) is in the cache. If so, the router replaces the broadcast address

in the Request with the unicast IP address of the server. The router then forwards

the Name Query Request to the server.

For instructions on using Site Manager to conﬁgure name entries, see “Editing NetBIOS/

IP Static Entry Table Parameters” on page 8-18.

For instructions on using Site Manager to customize a NetBIOS cache, see “Editing

NetBIOS/IP Global Parameters” on page 8-10. To enable caching on a NetBIOS

interface, see the NetBIOS Name Caching parameter on page 8-17.

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Avaya Configuring IP Services Uživatelský manuál Strana 322