[Csci551-talk] Re: questions on the shaikh paper
johnh at ISI.EDU
Thu Feb 12 21:50:58 PST 2004
On Thu, 05 Feb 2004 14:00:31 PST, Mehdi Sharifzadeh wrote:
>> I have the following questions on the Shaikh paper titled " Routing stability in congested networks"
>> 1) What is the significance of the LOT ? Why has it been calculated for all the cases that they have experimented on? Why is it so imp?
>It is used to assign the cost to the transition from the last state to the
>init state. This is because it takes LOT time for the receiver timer to
>expire and find that the message has been lost. That's when the state of
>the whole system should be initiated to the init state.
Exactly. It's just there to represent the remaining time until
>> 2) How did they arrive on the values of parameters A1 and A2 in D2U cycle of BGP. Also what is a1 and a2 in the equations given?
>Shaikh's master thesis  has a nice explanation of these parameters
>and Ra and Rb states
>The initial 3*RTT is the value for RTO which is
>doubled in the case of each retransmission.
And ultimately these values derive from TCP timeout handling.
That's the subject of this week's class :-)
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