Cisco Systems BC-281 Manual De Usuario

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:

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.

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