Cisco Systems BC-145 用户手册

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:

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 

 in the “Using Cisco IOS Software” chapter.

This section contains information related to Cisco’s implementation of TRISL that you should 
understand before you proceed to the 

.

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.