O'Reilly logo

Building Resilient IP Networks by Kok-Keong Lee, - CCIE No. 8427

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Appendix A. Calculating Network Availability

This appendix discusses mathematical calculations to calculate network availability. The percentage method specifies the expected amount of system downtime. The defects-per-million method specifies the actual system performance. The availability method enables you to calculate theoretical availability based on manufacture information. This appendix also includes an availability-calculation example for a simple network topology.

The Percentage M ethod

The percentage method describes availability based on a percentage of the total number of minutes in one year (525,960 minutes, a figure that takes leap years into account). Table A-1 shows the availability percentages.

Table A-1 Fives-Nines Availability ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required