Zech-Cranz' Aufgabensammlung zur theoretischen Mechanik by von Eberhard O. (ed.) PDF

By von Eberhard O. (ed.)

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Example text

For example, how does SNMP or the performance management tool know the available bandwidth? In some cases, the SNMP tool simply polls the MIB II IfSpeed value to determine the bandwidth. This can be a problem on WAN links because the IfSpeed value represents the bandwidth of the physical interface. With ATM or frame relay, the actual bandwidth may be quite different because of rate limiting or multiple virtual circuits configured on one physical interface. With ATM, configure to the subscribed bandwidth.

The organization should talk to the carrier to understand what can be expected in the way of performance and at what subscription levels. This drives traffic shaping, and possibly bandwidth requirements for the carrier network. When you have analyzed WAN bandwidth, redundancy, diversity, carrier, and media requirements, you may need to investigate carrier services for IP telephony or upgrade current services. Potential services include WAN pt-to-pt (T1, E1, T3 & E3), ATM, frame relay, and fractional T3 services that support HSSI, POS, or frame relay link level protocols.

You can measure delay, jitter, and packet loss in a few ways. You can use ping scripts to determine minimum and maximum delay, jitter, and packet loss. In this case, packets sent should approximate voice packets in size (about 60 bytes). You may also have a tool such as Internet Performance Manager (IPM), part of the WAN management suite of CiscoWorks 2000, which can send voice type packets to determine delay, jitter, and packet loss. The table that follows is an example performance baseline for WAN links.

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Zech-Cranz' Aufgabensammlung zur theoretischen Mechanik nebst Aufloesungen by von Eberhard O. (ed.)


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