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Data Link Switching Overview

304233-A Rev. 00

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Bay Networks provides two ways to communicate directly with an SNA processor

(such as an IBM 3745 or AS/400) over Frame Relay:

• Boundary Network Node (BNN)

• Boundary Access Node (BAN)

Boundary Network Node (RFC 1490)

BNN refers to RFC 1490, Routed SNA over Frame Relay. This implementation of

LLC2 also complies with the Frame Relay Forum 3 (FRF.3), “Multiple Protocol

Encapsulation over Frame Relay Implementation Agreements,” which defines

how SNA traffic traverses a Frame Relay network.

BNN allows native SNA traffic (originating from SDLC, LAN- or WAN-attached

devices) to communicate directly over public or private Frame Relay networks

with an SNA processor. Devices can communicate with intermediate routing

nodes, or in a single-switch configuration function as a FRAD.

Since BNN does not carry the destination and source MAC addresses in the

network packets, the BNN format carries the fewest number of bits per packet and

yields low network overhead. Therefore, you must explicitly define the PVC to

carry the packet to its destination. You do this with the LLC2 Frame Relay

Mapping Table. The mapping table consists of three fields:

• DLCI, which represents a Frame Relay PVC

• Remote MAC, which is the destination MAC address

• Local MAC, which is the source MAC address

Each entry requires that you specify the Remote MAC, Local MAC, or both. A

packet that matches this entry is then forwarded to the specified data link

connection identifier (DLCI).

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Avaya Configuring DLSw Services Manual do Utilizador Página 47