Avaya Configuring LLC Services Uživatelský manuál stáhnout pdf (Strana 19)

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Chapter 1

Logical Link Control Overview

LLC is a standard protocol within the CCITT 8802.2 and IEEE 802.

family of

LAN standards. Connection-oriented protocols, including IBM Systems Network

Architecture (SNA) and NetBIOS, use LLC services. Connection-oriented

protocols do not have a network layer address (such as an IP subnet) to route

information. Instead, before any information transfer occurs, a device on the

network sends a “broadcast” or “explorer” frame to locate the session partner.

From this broadcast, the network establishes a path for the data transfer.

LLC2 trafﬁc is generally sensitive to excessive network delays, causing problems

with SNA and NetBIOS sessions. Data Link Switching (DLSw) and Advanced

Peer-to-Peer Networking (APPN) resolve these problems by locally terminating

the LLC2 session at the router, and providing a local acknowledgment to

SNA/NetBIOS workstations. The LLC2 subsystem provides these services.

The Bay Networks implementation of the LLC protocol consists of LLC Class 1

(LLC1), a connectionless service, and LLC Class 2 (LLC2), a connection-oriented

service. The subsystems that require LLC2 services are

• DLSw

• APPN

• LAN Network Manager (LNM)

Most other protocols use LLC1, or connectionless, delivery services.

Generally there is no need to change the LLC2 default settings in Site Manager.

However, you can tune the network by changing these default settings. In Site

Manager, you should not select LLC2 on an interface without also selecting one of

the preceding protocols.

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Avaya Configuring LLC Services Uživatelský manuál Strana 19