This document describes some of the common issues related to connecting Catalyst switches and Workgroup concentrators to Fiber Distributed Data Interface (FDDI) networks. It includes information on supported topologies (what connects to what) as well as common interface and cable types. It shows how to enable and disable FDDI ports and explains how to verify that the FDDI ring is operational.
For more information on document conventions, see the Cisco Technical Tips Conventions.
There are no specific prerequisites for this document.
To create the scenarios in this document, we used the following equipment in a lab environment:
A console cable suitable for each of the devices presented
One WS-C1100* FDDI concentrator
One WS-C1201 Ethernet switch
One WS-C1400 FDDI concentrator
One Catalyst WS-C5505
One Catalyst WS-C2820
One Catalyst WS-C5505
* The WS-C1400 replaced the WS-C1100. The product catalog information on the WS-C1100 is no longer available.
The information presented in this document was created from devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If you are working in a live network, ensure that you understand the potential impact of any command before using it.
Most of the topology information in this document also applies to routers, servers, and other FDDI-capable devices.
Appendix D contains an exercise in reverse engineering a FDDI network topology by using only the commands available on the switches and concentrators. This exercise provides examples of the fundamental commands necessary for managing a FDDI network comprised of switches and concentrators.
This document is focused on the behavior of FDDI when topological changes occur within the network. It is not a tutorial on the FDDI networking specifications. Although having a solid understanding of the ANSI FDDI standards is helpful in managing a FDDI network, it is not a requirement for resolving many common issues.
This document does not include information on Layer 2 and above issues such as VLANs, FDDI to Ethernet frame translation, FDDI to Token Ring frame translation, or Transparent Bridging (802.1d STD).
The Related Information