[99323] in North American Network Operators' Group
Re: Question on Loosely Synchronized Router Clocks
daemon@ATHENA.MIT.EDU (Bora Akyol)
Mon Sep 17 19:22:20 2007
Date: Mon, 17 Sep 2007 16:21:24 -0700
From: Bora Akyol <bora.akyol@aprius.com>
To: Xin Liu <smilerliu@gmail.com>
CC: <nanog@merit.edu>
In-Reply-To: <ea11805f0709171554k5660bbc5h23f2491735f510f8@mail.gmail.com>
Errors-To: owner-nanog@merit.edu
IMHO:
What ever solution you end up proposing should able to handle (3) and should
work with arbitrary boundaries for (1) & (2).
We don't want to add another failure mode to the network that depends on
time synchronization.
You don't want to shift the problem from BGP to NTP.
Regards
Bora
On 9/17/07 3:54 PM, "Xin Liu" <smilerliu@gmail.com> wrote:
>
> Sorry for the confusion. Let me clarify.
>
> We are interested in a number of questions:
> 1. Can we assume loosely synchronized router clocks in the Internet,
> or we have to make absolutely no assumption about router clocks at
> all?
> 2. If the router clocks are indeed loosely synchronized, what is the
> granularity we can assume? Particularly, we are interested in whether
> we can assume router clocks are synchronized within 10 minutes.
> 3. It's always possible that a router's clock goes wrong. In practice,
> how often does this happen?
>
> Thank you for all the replies.
>
> Best
> Regards,
>
> Xin Liu
>
> On 9/17/07, Randy Bush <randy@psg.com> wrote:
>>
>> i conversed offline with the OP. he was reading a sigcomm research
>> paper and confusing it with the internet.
>>
>> randy
