Token Ring Switching Design and Implementation Guide

Token Ring Switching Design and Implementation Guide is a free online book by Cisco and it covers many topics related to iToken Ring Switching.


The traditional method of connecting multiple Token Ring segments is to use a source-routing bridge (SRB). For example, bridges are often used to link workgroup rings to the backbone ring. However, the introduction of the bridge can significantly reduce performance at the user’s workstation. Further problems may be introduced by aggregate traffic loading on the backbone ring.

To maintain performance and avoid overloading the backbone ring, you can locate servers on the same ring as the workgroup that needs to access the server. However, dispersing the servers throughout the network makes them more difficult to back up, administer, and secure than if they are located on the backbone ring. Dispersing the servers also limits the number of servers that particular stations can access.

Collapsed backbone routers may offer greater throughput than bridges, and can interconnect a larger number of rings without becoming overloaded. Routers provide both bridging and routing functions between rings and have sophisticated broadcast control mechanisms. These mechanisms become increasingly important as the number of devices on the network increases.

The main drawback of using routers as the campus backbone is the relatively high price per port and the fact that the throughput typically does not increase as ports are added. A Token Ring switch is designed to provide wire speed throughput regardless of the number of ports in the switch. In addition, the Catalyst 3900 Token Ring switch can be configured to provide very low latency between Token Ring ports by using cut-through switching.

As a local collapsed backbone device, a Token Ring switch offers a lower per-port cost and can incur lower interstation latency than a router. In addition, the switch can be used to directly attach large numbers of clients or servers, thereby replacing concentrators. Typically, a Token Ring switch is used in conjunction with a router, providing a high-capacity interconnection between Token Ring segments while retaining the broadcast control and wide-area connectivity provided by the router.

Table of Contents

  • Overview of Token Ring Switching
  • Features and Specifications of the Catalyst Token Ring Switches
  • Interconnecting Switches
  • Token Ring VLANs and Related Protocols
  • ATM and Token Ring LANE
  • Network Management
  • Using a Switch for Ring Microsegmentation
  • Classic Token Ring Bridged Network Migration
  • Connecting Two Catalyst 3900s via TokenChannel
  • Connecting Catalyst Token Ring Switches via an ATM Backbone
  • Configuring and Managing Token Ring Switches
  • Configuring IP Routing between Token Ring VLANs on the Catalyst 5000 RSM
  • Configuring and Managing Token Ring Switches
  • Frame Formats

Book Details

Author(s): Cisco Systems Inc.
Format(s): HTML
Link: Read online.

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