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Frame Relay Access Support (FRAS)

Introduction

Using Frame Relay Access Support (FRAS), the Cisco IOS Software allows branch SNA devices to connect directly to a central site Front End Processor (FEP) over a Frame Relay network. FRAS converts LAN or SDLC protocols to a Frame Relay format understood by the Network Control Program (NCP) that runs in the FEP. The Cisco IOS Software and the NCP support two frame formats:

• RFC 1490 routed format for LLC2, specified in the FRF.3 Agreement from the Frame Relay Forum and known in NCP literature as Frame Relay Boundary Network Node (BNN) support. Support for this feature requires NCP 7.1 or higher.

• RFC 1490 802.5 source-route bridged format, known in NCP literature as Frame Relay Boundary Access Node (BAN) support. Support for this feature requires NCP 7.3 or higher.