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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.

The Cisco 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.

The async-generic item 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.

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 

. The features that require SDLC configuration and use SDLC parameters are 

listed in the 

.

LLC2 and SDLC package data in frames. LLC2 and SDLC stations require acknowledgments from 
receiving stations after a set amount of frames have been sent before sending further data. The tasks 
described in this chapter modify default settings regarding the control field of the data frames. By