VoIP Readiness Assessment Traffic data collection: Probe/Endpoint locations?

Posted on 2005-04-13
Last Modified: 2008-01-09
VoIP Readiness Assessment Analysis: Probe/Endpoint locations?
*What criteria? How do you determine where to place the probes?
After much researching, i have not found this specific info?
Senario: 15,000 Node multi-floor Network/Average mid-range IT budget/5000/5500 Cisco
[Describe, diagram or layout any average Core Backbone Router/Switch infrastructure for this environment]
Goal: Collect all data traffic without disturbing existing Network/Engineers will analysis later.
On-site assessment to assess the network, compile and collect data and make a broad assessment of traffic patterns within the network - Engineers will prepare recommendations
*Which Analyzer/Hardware vs Software? Prognosis? Qualys? MBSA? ClearSight? NetIQ? LanStat? LanSurveyor? Other?
*How many probes will be required & Where should the probes be placed?

Example: Cisco IOS Devices allow synthetic data collection.
Setup SPAN/port mirroring at the core switch/router to collect traffic data.

*How do we collect/what rules determine data collection for all traffic accross entire LAN.
WAN sites another issue at another tiem.

If 12,000 nodes get IP phones, it seems that all subnets/VLANs/Switch traffic would need to be collected and yet that seems way to granular?

What am i overlooking?  Thanks for the input!
Question by:kbbcnet
    1 Comment
    LVL 7

    Accepted Solution

    Pick 4 client sites (user PC's that would probably have a phone). If you have VLANs, pick one site in each vlan. Place another probe where the VoIP server would sit (server VLAN, or off core switch, or wherever it would be placed in the network.)

    Since the VoIP traffic will be segregated into a number of separate VLANs, You may want to look at a separate default router for these VLANs

    I would start by using SPAN (or something equivalent) on the switches with a PC running ethereal. THis can get a good 10 minutes of traffic that can begin the analysis and start you in the right direction of what problems exist in the network.

    The tools above are great (if you have a lot of time to set them up and run the baselines they require). NetIQ is probably my favorite.

    What are you looking for advice on?

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