From: Scott Vermillion (scott_ccie_list@it-ag.com)
Date: Mon Mar 03 2008 - 18:05:31 ARST
LOL, I like that department of redundancy department thing.
There's a nuance here Jeff. Option B is not redundant; it's different. In
A, the policer will kick in if the interface to which it's applied
experiences congestion (the TxRing fills). It otherwise does not police
class voice to 500. Option B is different in that it still guarantees the
500 during times of congestion, but it further polices class voice even when
no congestion is experienced. This might be a desired behavior, but in your
hypothetical situation, you're likely paying for that VSAT carrier
regardless of use. In that case, it strikes me as silly to police class
voice to 500k and potentially waste 256k of capacity that you're paying for.
But if you're on some kind of usage system of billing, then maybe that is
your desired behavior. Or maybe you don't want your users getting too
accustomed to good service! ;~)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Biggs, Jeff (M/CIO/BIE)
Sent: Monday, March 03, 2008 12:58 PM
To: Sadiq Yakasai; Scott Vermillion
Cc: Spolidoro, Guilherme; Gaurav Prakash; groupstudy groupstudy
Subject: RE: LLQ
Isn't the idea for option A to make sure voice gets the 500K in times of
congestion? So if I have a 768K VSAT connection, when the Windows AD is
chewing up my bandwidth and other web users are surfing/youtub'ing...I
want that 500K for the 25 G729 voice calls if it is needed.
Option A is already a policer, so wouldn't option B be sort of like the
"department of redundancy department"?
Jeffrey Biggs
Sr. Network Engineer
USAID
M/CIO/BIE
240-646-5003
jbiggs@usaid.gov
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Sadiq Yakasai
Sent: Monday, March 03, 2008 2:41 PM
To: Scott Vermillion
Cc: Spolidoro, Guilherme; Gaurav Prakash; groupstudy groupstudy
Subject: Re: LLQ
Scott,
You are absolutely right there. This is always one of those areas in
which one needs to hypothesize (if this word exists :)) i guess.
It basically comes down to the definition of congestion on the
interface.
In the second case (B), they wld definately be policing themselves
even without congestion.
So, when is the interface "congested" again? When they packets start
filling up the interface queue? If so, to what limit?
Mayb i need to check with my Odom and refresh me mind here.
This archive was generated by hypermail 2.1.4 : Tue Apr 01 2008 - 07:53:52 ART