Browse Prior Art Database

Routing AppleTalk Over Frame Relay Networks

IP.com Disclosure Number: IPCOM000112507D
Original Publication Date: 1994-May-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 76K

Publishing Venue

IBM

Related People

Fahmy, AF: AUTHOR [+2]

Abstract

Described is a method for the acquisition of unique protocol addresses and the mapping of these addresses to frame relay DLCIs as part of routing AppleTalk protocol frames through a multiprotocol router.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Routing AppleTalk Over Frame Relay Networks

      Described is a method for the acquisition of unique protocol
addresses and the mapping of these addresses to frame relay DLCIs as
part of routing AppleTalk protocol frames through a multiprotocol
router.

      Routing AppleTalk* protocol packets through a Frame Relay
network is made difficult because of the dynamic nature of AppleTalk
protocol addresses.  The main problem lies in acquiring a unique
address for every AppleTalk port on the network and mapping these
addresses to Frame Relay DLCIs.

The following steps describe the disclosed method for solving the
above problem:

1.  In the router configuration, the user defines the Frame Relay
    DLCIs which are used to transport AppleTalk traffic on the Frame
    Relay network.  These are a subset (or all of) the DLCIs
    available for the router on the physical port being defined.

          Additionally, as with other port types such as Ethernet or
    Token-Ring, the user defines the port as a seed or non-seed port
    and defines network parameters (network number range and zone
    list) in the case of a seed port.

2.    The first operational step is for the router to acquire an
    AppleTalk protocol address for its own local port.

    a.  If the port is defined as non-seed, the router looks for an
        AppleTalk Routing Table Maintenance Protocol (RTMP) data
        packet being broadcast on the network by a seed(ed) router.
        The local router learns the network range from that packet
        and proceeds to probe for a unique AppleTalk protocol
        address.  If the port is defined as a seed port, the router
        proceeds directly to probe using the network range defined in
        its configuration.

    b.  The AppleTalk Phase II method of using AppleTalk Address
        Resolution Protocol (AARP) Probe packets is utilized.  These
        probe packets are broadcast on every DLCI defined in step 1.
        Other active routers on the Frame Relay network could respond
        if the probed address is being used.  The response is
        broadcast back on the network since address mapping has not
        yet...