LLC2 and Sdlc Parameters, Bstun Networks, BC-217

Overview of IBM Networking

LLC2 and SDLC Parameters

BSTUN Networks

The Bisync feature enables your Cisco 2500, 3600, 4000, 4500, 4700, and 7200 series router to support devices that use the Bisync data-link protocol. This protocol enables enterprises to transport Bisync traffic over the same network that supports their SNA and multiprotocol traffic, eliminating the need for separate Bisync facilities.

At the access router, traffic from the attached Bisync device is encapsulated in IP. The Bisync traffic can then be routed across arbitrary media to the host site where another router supporting Bisync will remove the IP encapsulation headers and present the Bisync traffic to the Bisync host or controller over a serial connection. HDLC can be used as an alternative encapsulation method for point-to-point links.

BSTUN Features

Cisco’s implementation of BSTUN provides the following features:

•Encapsulates Bisync, Adplex, ADT Security Systems, Inc., Diebold, asynchronous generic, and Monitor Dynamics Inc., traffic for transfer over router links. The tunneling of asynchronous security protocols (ASP) feature enables your Cisco 2500, 3600, 4000, 4500, or 7200 series router to support devices that use the following asynchronous security protocols:

–adplex

–adt-poll-select

–adt-vari-poll

–diebold

–async-generic

–mdi

•Provides a tunnel mechanism for BSTUN over Frame Relay, without using TCP/IP encapsulation.

•Supports Bisync devices and host applications without modification.

•Uses standard synchronous serial interfaces on Cisco 2500 series and the 4T network interface module (NIM) on the Cisco 4000 series and Cisco 4500 series.

•Supports point-to-point, multidrop, and virtual multidrop configurations.

Note The async-generic item, listed above, is not a protocol name. It is a command keyword used to indicate generic support of other asynchronous security protocols that are not explicitly supported.

LLC2 and SDLC Parameters

The LLC2 and SDLC protocols provide data link layer support for higher-layer network protocols and features such as SDLC Logical Link Control (SDLLC) and RSRB with local acknowledgment. The features that are affected by LLC2 parameter settings are listed in the next section, “Cisco’s Implementation of LLC2.” The features that require SDLC configuration and use SDLC parameters are listed in the section “Cisco’s Implementation of SDLC” later in this chapter.

Cisco IOS Bridging and IBM Networking Configuration Guide