[112591] in North American Network Operators' Group
Re: Network SLA
daemon@ATHENA.MIT.EDU (Charles Wyble)
Mon Mar 9 13:37:24 2009
Date: Mon, 09 Mar 2009 10:37:08 -0700
From: Charles Wyble <charles@thewybles.com>
To: "Holmes,David A" <dholmes@mwdh2o.com>
In-Reply-To: <485ED9BA02629E4BBBA53AC892EDA50E08851696@usmsxt104.mwd.h2o>
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
What products/services do you use for traffic generation? Also what
sort of testing methodology do you use? As for random probes that
certainly seems like a nice feature.
Holmes,David A wrote:
> We use BRIX for SLA's by measuring round trip times, jitter, and packet
> loss across all of our backbone links. In conjunction with a traffic
> generator to add background traffic, and potentially invoke queueing on
> interfaces, we have found that BRIX enables us to accurately predict the
> behavior of new applications, particularly multicast and HD video,
> without the need to implement elaborate QoS configurations. BRIX is now
> owned by EXFO, a fiber optic test equipment manufacturer. Low values for
> rtt, jitter, and packet loss imply a relatively queue-free network,
> which makes confident predictions about network behavior easier.
> When we last looked at the technology, the Cisco IP SLA probes did not
> capture a random distribution of network events, as the probes are
> triggered every N minutes. BRIX randomizes the probes within a
> configurable window, so that, over time, all time intervals are covered
> by the accumulated probes.
>
>
--
Charles N Wyble charles@thewybles.com
(818)280-7059 http://charlesnw.blogspot.com
CTO SocalWiFI.net
