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BC-281
Cisco IOS Bridging and IBM Networking Configuration Guide
78-11737-02
Configuring Data-Link Switching Plus
This chapter describes how to configure data-link switching plus (DLSw+), Cisco’s implementation of
the DLSw standard for Systems Network Architecture (SNA) and NetBIOS devices. Refer to the DLSw+
Design and Implementation Guide for more complex configuration instructions. For a complete
description of the DLSw+ commands mentioned in this chapter, refer to the “DLSw+ Commands”
chapter of the Cisco IOS Bridging and IBM Networking Command Reference (Volume 1 of 2). To locate
documentation of other commands that appear in this chapter, use the command reference master index
or search online.
This chapter contains the following sections:
• Technology Overview, page 281
• DLSw+ Configuration Task List, page 288
• Verifying DLSw+, page 310
• Monitoring and Maintaining the DLSw+ Network, page 311
• DLSw+ Configuration Examples, page 312
To identify the hardware platform or software image information associated with a feature, use the
Feature Navigator on Cisco.com to search for information about the feature or refer to the software
release notes for a specific release. For more information, see the “Identifying Platform Support for
Cisco IOS Software Features” section on page lv in the “Using Cisco IOS Software” chapter.
Technology Overview
DLSw+ is a method of transporting SNA and NetBIOS. It complies with the DLSw standard documented
in RFC 1795 and the DLSw Version 2 standard. DLSw+ is an alternative to RSRB that addresses several
inherent problems that exist in RSRB, such as:
• SRB hop-count limits (SRB’s limit is seven)
• Broadcast traffic (including SRB explorer frames or NetBIOS name queries)
• Unnecessary traffic (acknowledgments and keepalives)
• Data-link control timeouts