2-2 FDDI Interfaces

  • FDDI supports 100 Mbps data transfer rates using a token-passing scheme.

  • A dual counter-rotating fiber- optic ring makes up an FDDI network.

  • The total length of the fiber ring must be less than 200 km.

  • A FDDI network can have up to 500 stations , separated by no more than 2 km (MMF) or 10 km (SMF).

  • FDDI frames can contain from 17 to 4500 bytes.

  • FDDI interfaces can act as either Single-Attach Stations (SASs) or Dual-Attach Stations (DASs)

Configuration

  1. (Optional) Configure the ring scheduling:

     (interface)  fddi token-rotation-time   microseconds  

    To vary the token's availability, the token rotation time can be set to microseconds (4000 to 165000 usec; the default is 5000 usec).

  2. (Optional) Set the number of frames to transmit at one time:

     (interface)  fddi frames-per-token   number  

    Each time the token rotates and is captured, a number of queued frames are transmitted to the ring. The number of frames can be from 1 to 10 (the default is 3).

Example

An FDDI interface is configured with IP and IPX addresses. It transmits up to eight frames per token.

  interface fddi 4/0   description Server Farm FDDI ring   ip address 10.1.1.1 255.255.255.0   ipx network 1234   fddi frames-per-token 8  


Cisco Field Manual[c] Router Configuration
Cisco Field Manual[c] Router Configuration
ISBN: 1587050242
EAN: N/A
Year: 2005
Pages: 185

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