The SDLC commands described in this chapter pertain to routers configured as SDLC stations. This is in contrast to a router configured for SDLC Transport where the router is not configured as an SDLC station, but acts as an intermediary, passing SDLC frames between two SDLC stations across a mixed-media, multiprotocol environment. Use the commands in this chapter to adjust the router's LLC2 and SDLC parameters. This command has no arguments or keywords. Primary nodes poll secondary nodes in a predetermined order.
Secondaries then transmit if they have outgoing data.
When configured as primary and secondary nodes, our routers are established as SDLC stations. Use the sdlc role interface configuration command to establish the role as primary or secondary. In a typical scenario, an EC may be connected to dumb terminals and to a Token Ring network at a local site. Typically, the two sites are connected through an SDLC leased line. If a router is connected to an EC, the router takes over the function of the FEP, and must therefore be configured as a primary SDLC station.