From: Scott Morris (swm@emanon.com)
Date: Fri Oct 01 2004 - 08:37:14 GMT-3
While I haven't read the article, I think I can hazard a guess here...
In order to measure the delay on your network, you have to have multiple
routers participating (at least the two end-points). And for the packets in
question (taking into account any fancy queuing you have at different points
to "speed up" voice packets) you need to do voice-related debugs.
And in order for the voice-related debugs to make sense, your times need to
match.
If you place a call at 9:10:45.334 Sep 1 1994 on one side, and it is
received at 22:19:01.583 Apr 19 1998 on the other side, I am assuming that
you don't have a 5-year latency on your network. But your guess is as good
as mine on its real value.
So having the routers you are debugging on agree on time is pretty well
crucial.
You can always look at traceroute and pings as well, but remember if you are
queuing anyplace, that becomes a less accurate method. Plus those are
round-trip measurements rather than one-way.
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, CISSP,
JNCIP, et al.
IPExpert CCIE Program Manager
IPExpert Sr. Technical Instructor
swm@emanon.com/smorris@ipexpert.net
http://www.ipexpert.net
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Elson Burrao
Sent: Friday, October 01, 2004 5:27 AM
To: ccielab@groupstudy.com
Subject: Is your Network Ready for Voice?
Hi Guys,
I was reading Packet this month and on page 9 "Is Your Network Ready for
Voice?" They said that delay one way "rely" on NTP across your network. Does
that mean that if I don't have a central NTP Server and most of my routers
are with their clock in 1993 :) I'm not getting the correct measures for
one-way delay?
Am i confusing the whole thing?
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