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BC-145
Cisco IOS Bridging and IBM Networking Configuration Guide
78-11737-02
Configuring Token Ring Inter-Switch Link
This chapter explains how to configure Token Ring Inter-Switch Link (TRISL) on Cisco routers. The
chapter describes TRISL in the context of the Inter-Switch Link (ISL) protocol and the Token
Ring VLAN concept.
For a complete description of the Token Ring Inter-Switch Link commands in this chapter, refer to the
“Token Ring Inter-Switch Link Commands” chapter in 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. For information on how Token Ring
VLANs are implemented on switches, refer to the Catalyst Token Ring Switching Implementation Guide,
the Catalyst 5000 Series Token Ring Configuration Notes, the Catalyst 3900 Token Ring Switching User
Guide, and the Catalyst 3920 Token Ring Switching User Guide.
This chapter contains the following sections:
• Technology Overview, page 145
• TRISL Configuration Task List, page 148
• Monitoring TRISL Statistics, page 153
• TRISL Configuration Examples, page 154
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 li in the “Using Cisco IOS Software” chapter.
Technology Overview
Cisco’s TRISL Implementation
This section contains information related to Cisco’s implementation of TRISL that you should
understand before you proceed to the “TRISL Configuration Task List” section on page 148.
ISL and TRISL
ISL is a Layer 2 protocol that enables switches and routers to transport Ethernet frames from multiple
VLANs across Fast Ethernet or Gigabit Ethernet links. Cisco’s TRISL protocol extends the ISL model
to include the transport of Token Ring frames from multiple VLANs across these same links.