By Matt Crane
By Matt Crane
Thousands of organizations have been able to slash costs using Cisco’s Dynamic Multipoint VPN (DMVPN). This technology was introduced some time ago and is most used for enabling fully meshed communication for mobile workers, telecommuters and extranet users.
DMVPN is a Cisco IOS ® Software-based security solution for building scalable enterprise VPNs that support distributed applications such as voice and video. DMVPN is a combination of the following technologies:
Rolling out QoS for Voip & Video is challenging enough but traffic shaping over links that do not offer protection of policies is a daunting proposition, remembering all the while that the internet is not QoS aware!
Should we even consider the value of end to end QoS? Clark Zoeller, LiveAction Sales Engineer makes these points in his Blog “The Case for NOT Deploying End-to-End QoS” with a range of links available that each have differing and variable bandwidth its easy to understand why network engineers become frustrated managing QoS over these connections.
We can achieve success however by applying global policies at hub level, shaping the tunnel to individual spokes (parent/child policy) which allows us to differentiate data flows with the NHRP group selecting the spoke, shape & policy. Here is a great article highlighting this on Networking with Fish – DMVPN & Per-Tunnel QoS
Like everything else here at Prosperon we believe in Design, a well thought out Lab to Live implementation is key to success, considering these points:
The challenge continues however because you are looking at hundreds of lines of configuration code from already existing policies at the datacentre as well as now at each hub, this is where a tool like Live Action can minimize this element of configuration pain using its powerful QoS control engine and rich visualization capabilities to configure, monitor, troubleshoot and validate DMVPN policies fast, so that DMVPN is more about ROI and less about challenges.
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