Slow performance post IP telephony implementation

90 pts.
Tags:
Bandwidth
Network monitoring
Performance management
I have a site that recently implemented an IP telephone system. It went from a flat IP network to a structured network with VLANs and QOS. After the implementation, users started complaining that their applications began to have poor performance. These applications varied from e-mail client, mapped drive file access to telnet client response. Network statistics (pings & SNMP utilization stats) from switches and routers do not show any items of particular concern or high response times. Anything else that you can think of that I can look at without having to spend lots of $$$ to analyze the problem? Note that the infrastructure is all Cisco and there are no complaints at all concerning voice or call quality. Thanks in advance.

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It sounds like your quality of service preferences are causing the less priviledged traffic to suffer delays. You might want to use ntop and/or ethereal to see what the actual traffic is like. These utilities both come free with linux.

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  • LabNuke
    Sounds good and I have those tools in by toolkit. So, how do I configure the switch to send the traffic to the sniffer? Thanks.
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  • Astronomer
    Cisco calls it the SPAN feature. Take a look at this link: http://www.cisco.com/warp/public/473/41.html rt
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  • LabNuke
    Thanks for the information! This is exactly what I am looking for. Now that I can capture traffic, the next step is analyzing it and there lies another challenge to determine what is unusual and might be causing slow performance.
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