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<big><big>The report seermed to like the boxes from the companies that Alcatel
bought. On this side of the pond they<br>
did not get alot of traction.<br>
<br>
>From my experience with a "large" Cisco network besides the normal too many
fingers on the CLI to the router there were about one to<br>
two hardware failures a week on the big "C" devices. Most of these were
interface cards but some were control cards on switches.<br>
<br>
As long as you did not overrun the 12xxx series with too many BGP updates
per unit of time they as a box were stable.<br>
<br>
To calculate "99.99" per cent uptime you -<br>
<br>
Define scheduled down time as any maintanance that can be done after giving
the worldwide network at least five minutes notice of major<br>
network outages ...<br>
<br>
Define the device to be up as long as you can secure telnet into the box
and get a command prompt -<br>
<br>
Ignore BGP, routing or forwarding tables or any other routing issues because
"Up-Time" means the box is up not that it is doing any usefull work ...<br>
<br>
And finally go back to a "real person" deterministic protocol like "ATM"
with PNNI and UNI so you <br>
"know" when the network is down and do not have to guess ... My layer two
network ran for two years with no hardware or routing issues ...<br>
<br>
The other minor technical issue is that say you can calculate uptime on a
"router" how do you calculate up time on the network? ... Since<br>
just because one router is down the "network" is still up so individual up-time
for a router in an IP network may only affect SLAs for customer<br>
directly attached to it.<br>
<br>
John (It Suites Dennis's Needs) Lee<br>
<br>
David Barak wrote:<br>
</big></big>
<blockquote type="cite"
cite="mid20030410150714.92201.qmail@web14901.mail.yahoo.com">
<pre wrap=""><big><big>Okay, I'll bite...
the mentioned file,
<a class="moz-txt-link-freetext" href="http://www.nspllc.com/New%20Pages/Reliable%20IP%20Nodes.pdf">http://www.nspllc.com/New%20Pages/Reliable%20IP%20Nodes.pdf</a>
seems to be fluff to me.
</big></big>
There are many assumptions and statements about
reliability, but the methodology of how the numbers
were reached is not present. If one assumes that one
has a router which fails very rarely, this would
dramatically affect network design. However, this is
an assumption, not a conclusion. The assumption of
the paper is that the Alcatel box has ultra-low
failure rates, while the Juniper and Cisco boxen have
relatively high failure rates. Personally, before I
let something like this influence my buying/design
decisions, I'd want to see some serious raw data...
=====
David Barak
-fully RFC 1925 compliant-
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