[pilc] Re: Link-layer Triggers Protocol draft

From: Alper E. YEGIN (alper@docomolabs-usa.com)
Date: Mon Jul 01 2002 - 22:31:44 EDT

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    Hello Mohammed,

    > 1. I am a little confused on location of the server. I dont understand
    where exactly this would reside in the infrastructure. For eg, in the
    RANwould this be on the RNC( radio network controller) but are we interested
    in all trigger notifications?. For eg, the mobile could change its
    association with a different Base station and have maintain same IP link.
    From an IP mobility perspective i would only be interested in triggers when
    the mobile is changing its IP attachment point.
    >

    The generator of the L2 trigger cannot assess whether this is interesting
    or not. It's up-to the consumer of the trigger to assess this. You are
    right,
    not all L2 events result in a L3 event. But this is not up-to the servers
    to decide...

    > 2. On page 9 you have a section that says the following
    >
    > "When a host receives a Link Up trigger, L2 address specified in the Event
    Data field indicates the link-layer address of the newly associated access
    point. Similarly, when an access router receives a Link Up trigger, L2 this
    address indicates the link-layer address of the newly associated access
    device."
    >
    > How does the server distinguish an access router client from a host
    client and send different information in the trigger data?.
    >

    In either case, L2 address is the address of the "other end" of the link.
    For example, if trigger is received by the access router, the "other end"
    of the link is "access device" of the wireless client.

    > 3. Can the host be registered to more than one server and receive more
    than one trigger notification at any time?. I believe it needs to maintain a
    unique registration at all times and send a deregistration to the old server
    everytime you move either as soon as you receive link-down on the old link
    or via new the new link.
    >
    >

    Hmmm. There may be a confusion here... Clients of this protocol
    don't register with the servers of this protocol each time a link
    goes down.

    This registration is pretty static. For example an access router registers
    with the access points... And a mobile host registers with its access
    device. Neither registrations have to change when mobile host moves around.

    > I have some more concerns/questions will share them after you reply.
    >

    Sure... I hope I answered your questions.

    alper

    >
    > Thanks,
    > Mohammed
    >
    > Mohammed D. Ali
    > Senior Engineer
    > NAT, Advanced Technology Group.
    > Motorola Inc.
    >

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