From: Bob Sinclair (bsin@cox.net)
Date: Sun May 09 2004 - 22:01:20 GMT-3
Ken,
Good question re shape peak. Found a doc, link below, that discusses the
idea behind shaping to a peak rate. The idea is that you want to push the
envelope for a class that can stand a little loss. Here is a quote:
quote:
Peak rate shaping allows the router to burst higher than average rate
shaping. However, using peak rate shaping, the traffic sent above the CIR
(the delta) has the potential of being dropped if the network becomes
congested.
If your network has additional bandwidth available (over the provisioned
CIR) and the application or class can tolerate occasional packet loss, that
extra bandwidth can be exploited through the use of peak rate shaping.
However, there may be occasional packet drops when network congestion
occurs. If the traffic being sent to the network must strictly conform to
the configured network provisioned CIR, then you should use average traffic
shaping.
end quote:
And here is the tiny url: http://tinyurl.com/3h3vn
HTH,
Bob Sinclair
CCIE #10427, CISSP, MCSE
www.netmasterclass.net
----- Original Message -----
From: "Kenneth Wygand" <KWygand@customonline.com>
To: <ccielab@groupstudy.com>
Sent: Sunday, May 09, 2004 7:58 PM
Subject: Shaping to Peak?
> Hey everyone,
>
> I'm really trying to understand all the options for QoS and I'm currently
looking at CB Shaping. Why would one want to shape to a _peak_ instead of
shaping to an _average_? I understand that shaping to a _peak_ will try to
send Bc + Be bits during every Tc, but doesn't that defeat the whole purpose
of shaping? Why not just shape to an _average_ but just make the Bc the
total combined value of the Bc and Be values used when shaping to a _peak_,
and not configure a Be?
>
> Am I missing something?
>
> TIA,
> Ken
>
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