Question on Loosely Synchronized Router Clocks

Bora Akyol bora.akyol at
Mon Sep 17 23:21:24 UTC 2007


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.



On 9/17/07 3:54 PM, "Xin Liu" <smilerliu at> 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 at> wrote:
>> i conversed offline with the OP.  he was reading a sigcomm research
>> paper and confusing it with the internet.
>> randy

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