RFC603

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Network Working Group J.D. Burchfiel RFC # 603 BBN-TENEX NIC # 21022 31 December, 1973


               Response to RFC # 597: Host Status


I have several questions about the November 1973 ARPANET

topographical map:

1.  AMES is 4-connected, i.e. four network connections will go down
    if the IMP fails.  Is there some aspiration that IMPs should be
    no more than three connected?
2.  The seven IMPS in the Washington area are arranged into a loop.
    This guarantees that local communication can take place even if
    one connection fails, and is probably a worthwhile preparation
    for area routing.  On the other hand, for example, a break
    between MIT-IPC and MIT-MAC will require them to communicate
    through a 12-hop path through Washington.  This can be remedied
    by a short (inexpensive) connection between Harvard and Lincoln
    Labs.  Is there a plan to pull the Boston area, the San
    Francisco area, and the Los Angeles area into loops like the
    Washington area?






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