[99335] in North American Network Operators' Group
Re: Question on Loosely Synchronized Router Clocks
daemon@ATHENA.MIT.EDU (Bora Akyol)
Tue Sep 18 12:11:09 2007
Date: Tue, 18 Sep 2007 09:09:58 -0700
From: Bora Akyol <bora.akyol@aprius.com>
To: Xin Liu <smilerliu@gmail.com>
CC: <nanog@merit.edu>
In-Reply-To: <ea11805f0709180855p3c8ab49fq4866399d4204ad00@mail.gmail.com>
Errors-To: owner-nanog@merit.edu
You can check freshness of a message by means of sequence numbers, no?
Bora
On 9/18/07 8:55 AM, "Xin Liu" <smilerliu@gmail.com> wrote:
> Ideally, yes, a protocol should not rely on clock synchronization at
> all. However, to ensure freshness of messages, we don't have many
> choices, and clock synchronization seems to be the least painful one.
> So we asked about router clocks on the current Internet. If normally
> router clocks are synchronized and we have a mechanism to detect and
> fix out-of-sync clocks, is it reasonable to assume clock
> synchronization in the rest of our design?
>
> Best
> Regards,
>
> Xin Liu
>
> On 9/17/07, Bora Akyol <bora.akyol@aprius.com> wrote:
>> 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
