Avaya Configuring IP Utilities Uživatelský manuál stáhnout pdf (Strana 134)

Configuring IP Utilities

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Configuring 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 2-9 on page 2-23, 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.

Enabling Name Caching on the Router

NetBIOS name caching enables the router to cache the name associated with each

NetBIOS server that is active on the network.

By default, NetBIOS name caching is disabled. You can use Site Manager to

enable name caching.

The 15-character NetBIOS name-caching parameter enables the router to treat a

NetBIOS name as either a 15- or a 16-character entity.

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Avaya Configuring IP Utilities Uživatelský manuál Strana 134