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CAC for DiffServLLQ

It seems, the only thing missing from DiffServLLQ is effective end-to-end Call Admission Control (CAC) or Network Admission Control (NAC). If RSVP is still unrealistic and/or unproven and Financials wouldn't dream about turning it up now, does anyone know if Cisco or other is working on a NAC-mechanism that has realtime visibility into the whole network, such that at any given time if signaling comes in for a call from PointA to PointE, that traverses links AB, BC, CD, and DE, some active network element could provide an admission or rejection based on the knowledge of how many other simultaneous calls are taking place across those links?

Thanks.

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Re: CAC for DiffServLLQ

Check out this article on the scalability enhancements to RSVP. Sounds like RSVP will now do exactly what you suggest.

http://www.cisco.com/en/US/partner/products/sw/iosswrel/ps1839/products_feature_guide09186a0080087b49.html

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