These are good values to work from, and all of LAN ones are achievable in
your environment, because the Ethernet wiring is under your control. If you
are getting a lot of collisions, then swich from hubs to switches, CRC
errors -> Upgrade your wiring. You have control over your networks
condition, and you can keep it healthy. If your WAN links are flaky, then
you can make provisions for with redundancy.
I didn't mean to sound harsh, but most of these things are LAN/Design
related. I would be beaten by the masses if broadcast traffic came up to
20% of the network bandwith or if the ethernet utilization came to 50%.
----Original Message Follows----
From: Raees Ahmed Shaikh <[EMAIL PROTECTED]>
Reply-To: Raees Ahmed Shaikh <[EMAIL PROTECTED]>
To: "'[EMAIL PROTECTED]'" <[EMAIL PROTECTED]>
Subject: Health Checklist !!!
Date: Wed, 20 Sep 2000 18:07:13 +0300
These are some of the ideal counters for cisco routers network checks
regarding the health of the network,
No shared ethernet segments are saturated > 40 % network utilization.
No shared Token Ring segments are saturated > 70 % utilization.
No Wan links are saturated more than 70 % utilization.
The response time is generally less than milisecond 1/10 of second.
No segments 20% broadcasts/multicasts.
No segments have more than one CRC per million bytes of data.
On Ethernet segment less than 0.1 percent of packets result in collision.
Input queue drops not exceeding 50 in an hour.
Out put queue drops not exceeding 100 in an hour.
A question comes to my mind is that Are all this counters,
applicable to the real world scenarios or test labs ideal setups only. We
are here in Saudi Arabia, where usually the dedicated digital lines are
having lots of noises and interference, the usual counters on our routers,
are having lots of CRC's, lots of input, output errors, lot of collision on
the Ethernet ports, response time changes rapidly, the links flap very
often, I mean to say we are working in non-ideal working condition, do
these counters have a meaning to us, do we have to set our own guidelines
measures, based on monitoring results since last year. Do Cisco tests their
equipments in severe conditions which are far more worse than conditions in
US typically. Or does Cisco has some special recommendations for these
environments.
Pls. give your inputs based on your experiences on different mysteries
Telephone networks.
Shaikh Raees Ahmed,
Microsoft Certified Systems Engineer,
CCNA, CCDA.
Systems & Network,
IT Division.
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