Determining WAN T-1 bandwidth application requirements
Hey guy's just curious for some advice on favorite methods for calculating WAN voice and application bandwidth requirements over a T-1.
You need to come up with the bandwidth reqiurements for VoIP and a high priority application for implementing a QOS policy.
Say you have a site connected by a full point to point T1 and the remote site runs some VoIP and has a highly important Web based application.Traffic from both of these comes back across the WAN link. You are familiar with setting up QoS you just need to prioritize traffic, but need to calculate the bandwidth requirements for Voice and the web application. The web application you will prioritize based on the servers ip addresses being hit.
Re: Determining WAN T-1 bandwidth application requirements
If your question really is about calculating bandwidth before deployment, it's rather complex to do so correctly, and for traffic supporting a web application, unless someone can predefine how the web application should behave with regard to its bandwidth needs, it can be about impossible to precompute necessary bandwidth.
If your question is about bandwidth requirements after deployment, there are many options. One of the simplest is checking whether your seeing interface outbound drops. Assuming both LLQ for VoIP and the usual default queues sizes for other traffic, no or little drops likely indicates sufficient (or too much) bandwidth. If there are many drops, then you need to investigate further.
Otherwise, you can perform either SNMP stat polling or Netflow stat analysis, but both, I believe, require more effort, and both, I also believe, don't always clearly show the need for instantaneous bandwidth, which both the "QoS Bandwidth Estimation" and multi-level policer try to capture.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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