ADTRAN 1200130L2, 1200130L1 user manual Chapter Applications, SNA/SDLC with Local Spoofing

Chapter 4. Applications

Chapter 4

Applications

This chapter provides examples of some common FSU applica- tions. The examples include SNA/SDLC with local spoofing, SNMP/Telnet management, bisync point-to-point and multi- point, and transparent applications. The configuration selections given in these examples may need modification based on your network configuration.

SNA/SDLC with Local Spoofing

When used in an SNA/SDLC network, the FSU provides local spoofing by emulating the primary or secondary SDLC roles (see Figure 4-1). The FSU performs conversion from SDLC to frame relay and also terminates SDLC links, providing primary and secondary emulation between FSUs. Local spoofing improves performance by reducing traffic across the frame relay network and allows definite response times on the SDLC links.

To perform spoofing, the FSU automatically sets itself up to provide primary or secondary emulation based on the receipt of SNRM (set normal response mode) from an SDLC device. The FSU looks for SNRM on all ports and assumes a secondary role once SNRM is received. The FSU then brings up the LLC2 link across the frame relay network to another FRAD which assumes a primary role. This allows the FSU to operate with PU 2.1 devices.

Different roles can be assumed for each SDLC session. Discon- nection starts the role determination procedure again.

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