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Data Link Switching Overview

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LLC Support

Logical Link Control (LLC) is a standard protocol within the CCITT 8802.2 and

IEEE 802.x 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.

SNA needs a connection-oriented datalink layer for end-to-end packet sequencing

and error control. Over wide area networks (WANs), the Synchronous Data Link

Control (SDLC) protocol has traditionally met this need. However, in a LAN

environment, front-end processors (FEPs), controllers, and NetBIOS client/server

stations commonly use an LLC2 layer for this purpose. To support communication

among these devices, you can add LLC2 interfaces to a router configuration when

configuring DLSw.

LLC is supported on the router with PU type 2.0, 2.1, and 4.0 devices.

For more information on the Bay Networks LLC implementation, see Configuring

LLC Services.

SDLC Support

Integrated SDLC support merges the SDLC traffic with the multiprotocol traffic

of LANs into a single network backbone. SDLC operates in DLSw single-switch

routers, or in dual switch-to-switch networks, as illustrated in Figure 1-4

page 1-12

Integrated SDLC conversion enables existing SDLC traffic to share a backbone

network with LAN traffic without an intervening TCP/IP network. Traffic enters

the DLSw router as SDLC and goes out the router as LLC2 over Token Ring or

Ethernet. The destination endstation can reside on the Token Ring or Ethernet

network directly connected to that DLSw router. SRB can forward the traffic

through the network to a destination host or endstation. In this network, the local

router performs the SDLC conversion, and forwards the traffic across the network

to the host (Figure 1-9)

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Avaya Configuring DLSw Services Bedienungsanleitung Seite 41