High VPN router CPU utilization with voice traffic
I posted this question on the VPN forum, but no one responded...
I have two 2620 routers each with an AIM-VPN/BP hardware encryption module. They both have a T1 to an ISP, and we have a VPN tunnel set up between them. We are using single DES, not 3DES between these sites. I can send data through without any problem and I get the desired T1 speed that I want. However, if I send 6 or 7 g.729 (without cRTP) voip calls over that same link, the CPU utilization starts to peg out at 99%. This of course results in poor quality calls. Any idea why this is happening? I can change the codec to g.711 and it looks almost identical as far as CPU utilization. I have tested with 2 calls at both codecs, and they both put the same load on the CPU. What is causing this?
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The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...