Re: [Idr] Hold Negotiation

Danny McPherson <danny@tcb.net> Mon, 10 March 2008 17:07 UTC

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Subject: Re: [Idr] Hold Negotiation
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On Mar 10, 2008, at 8:54 AM, Vishwas Manral wrote:

> The point that I raise is the value that is negotiated. If my
> configured HoldTime is 0 and the received Hold time is 90. What is the
> smaller HoldTime? Is it 0 (which is just a place holder which implies
> infinity Hold Time as the timers are not started at all - so in
> practice is a larger Hold Time than 90) or is it 90 (numerically
> bigger than 0 - but in practice a smaller value).

Numerically, yes.  Logically, no.

> By the logic of it, the negotiated value should be 90 seconds and not
> 0 seconds, shouldn't it? As the RFC also states that:
>
>         Upon
>         receipt of an OPEN message, a BGP speaker MUST calculate the
>         value of the Hold Timer by using the smaller of its configured
>         Hold Time and the Hold Time received in the OPEN message.

That's not negotiation, it's computation.  If 0 represents infinity
and 90 represents, well, 90.  I'd consider 0 larger, if such a thing
were to occur.

-danny
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