Specifications

DC-758
Cisco IOS Dial Technologies Configuration Guide
Configuring Wholesale Dial Performance
Optimization
This chapter describes the Wholesale Dial Performance Optimization feature in the following sections:
• Wholesale Dial Performance Optimization Feature Overview
• How to Configure Automatic Command Execution
• How to Configure TCP Clear Performance Optimization
• Verifying Configuration of TCP Clear Performance Optimization
Note This task provides inbound and outbound performance optimization for wholesale dial customers
who provide ports to America Online (AOL). It is configured only on Cisco AS5800 access servers.
Wholesale Dial Performance Optimization Feature Overview
Both the inbound and outbound aspects of this feature are enabled using the autocommand-options
telnet-faststream command.
• Outbound—Provides stream processing, allowing the output data processing to occur at the interrupt
level. Being event driven, this removes polling and process switching overhead. In addition, the flow
control algorithm is enhanced to handle the higher volume of traffic and to eliminate some
out-of-resource conditions that could result in abnormal termination of the session.
• Inbound—Provides stream processing with the same improvements as for outbound traffic. Also, it
removes scanning for special escape characters in the data stream; this is very process-intensive and
is not required for this application. (In other situations, the escape characters allow for a return to
the privileged EXEC mode prompt (#) on the router.) In addition, Nagle’s algorithm is used to form
the inbound data stream into larger packets, thus minimizing packet-processing overhead.
This configuration is designed to provide more efficiency in the data transfers for AOL port suppliers
who are using a Cisco network access server to communicate with a wholesale dial carrier.
The Cisco AS5800 access server is required to support all dial-in lines supported by two complete T3
connections (that is, 1344 connections) running TCP Clear connections to an internal host. The desired
average data throughput for these connections is 6 kbps outbound and 3 kbps inbound.
When using the autocommand-options telnet-faststream command, no special character processing,
including break recognition, is performed on incoming data from the dial shelf. This requires the TCP
Clear connection to run as the sole connection on the TTY line. This sole connection is terminated by
TTY line termination or TCP connection termination, with no EXEC session capability for the user. This