From: Chris Lewis \(chrlewis\) (chrlewis@cisco.com)
Date: Sat Jun 25 2005 - 00:16:30 GMT-3
Some slightly different perspectives in-line
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
John Matus
Sent: Friday, June 24, 2005 9:22 PM
To: lab
Subject: QOS question/clarification: bandwidth, priority, shape, police
ok, i'm pretty sure that i've got this stuff covered but i'm sometimes
suprised at what kinds of answers labs have to specific qos quetions.
here are my pseudo-axioms.
1) police coming in, shape going out
In general, yes, but outbound policiing is also possible and could be a
requirement if the question is worded such tha anything over a given
rate is dropped or something similar.
2) provide at least this amount of band during times of congestion =
bandwidth
3) provide at most this amount of band during times of congestion =
priority
Priority means put this stuff at the top of the queue, this only takes
effect when there is congestion, as of course, without a queue, you have
no packets to re-order. As part of the priority command, there is a
natural policer action, such that if there is congestion, no more than
the specified rate will be treated with priority (ie jumped to the front
of the queue) and any excess is dropped.
4) provide an average of X band out an interface = shape
5) only allow x amount of band = policing.....
<ok, so really only #1 is an axiom>
my question is about "shaping". i cant remember back to any labs i did
as to how things were worded with regards to shaping. the only thing i
can think of
is "provide an average of x out an interface". can anyone think of
any
other catch phrases that might indicate the shaping is to be used?
Wording can be tricky, but if they are looking for shaping, the could
refer to things like delay, queue, store, anything like that.
TIA
Regards,
John D. Matus
MCSE, CCNP
Office: 818-782-2061
Cell: 818-430-8372
jmatus@pacbell.net
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