Figure 8-11 Toll bypass with voice network in C#

Decoder PDF 417 in C# Figure 8-11 Toll bypass with voice network

Figure 8-11 Toll bypass with voice network
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QoS on PE Router
Mapping Traffic to Tunnels
QoS on Core Routers
DiffServ-Aware Traffic Engineering
Public Network Issues for VoMPLS
Class 5 Legacy Switches
Figure 8-12 Toll bypass with voice/data converged network
PBX with Circuit Emulation Interface
PSTN-Traditional TDM Network
Toll Bypass
Enterprise LAN
GB Tunnel
Enterprise LAN
Solution Requirements
QoS on CE Router
QoS on PE Router
Mapping Traffic to Tunnels
QoS on Core Routers
DiffServ-Aware Traffic Engineering
Figure 8-13 Toll bypass with VoIP network
IP Phone IP MultiService Switch V CE
PSTN-Traditional TDM Network
Class 5 Legacy Switches MultiService Switch V
IP Phone IP
Toll Bypass
Enterprise LAN
GB Tunnel
Enterprise LAN
Solution Requirements
QoS on CE Router
QoS on PE Router
Mapping Traffic to Tunnels
QoS on Core Routers
DiffServ-Aware Traffic Engineering
entry of traffic is Providing low network jitter also reduces the requirement of large de-jitter buffers in the end nodes, resulting in smooth playback of voice at the receiving end For successful deployment, higher network availability and greater network resiliency must equal today s voice networks Meeting these requirements provides a powerful alternative to circuit switching, at a fraction of the cost
874 Technology Components
Eight
Cisco IOS software delivers a powerful combination of industry-leading technology and features to build a voice trunking solution with the assumptions and characteristics described previously The following Cisco IOS MPLS features are essential ingredients in building a profitable and highly robust voice trunking or toll-bypass trunking service Cisco MPLS Traffic Engineering (MPLS TE) Cisco MPLS TE automatically sets up Label-Switched Paths (LSPs) that can assure, through appropriate aggregate QoS (across the LSPs), to meet the bandwidth, delay, and jitter constraints imposed by the toll-bypass or voice trunking application Additionally, MPLS is the first step to set up these paths for carrying voice traffic in a diverse manner for better network utilization, over all throughput and resiliency in the network Cisco MPLS diffserv-Aware Traffic Engineering (MPLS DS-TE) Traffic engineering treats all traffic in the same manner and does not differentiate among traffic types To carry voice and data traffic on the same network, it may be necessary to separately account for the amount of voice traffic being transferred over the network to provide the necessarily stricter QoS guarantees Cisco DS-TE not only allows the configuration of a global pool for bandwidth accounting, but also provides a restrictive subpool configuration for high-priority network traffic such as voice Available bandwidth on the global pool and in the subpool are both advertised by IGP LSA or TLVs thus ensuring, each router tracks the available bandwidth when admitting new LSPs for voice or high priority traffic In this manner service providers, depending on their service level agreement (SLA) requirements, can choose to overbook lower-priority classes or underbook higher-priority traffic to meet stringent QoS requirements Obviously, they can charge a premium for that extra protection of voice traffic Cisco IOS QoS Cisco IOS software also provides a rich set of QoS features that are necessary to provide the minimum guarantees to TE tunnels These mechanisms work with DS-TE to provide a point-to-point guarantee for each service class At the network edge, traffic traveling into a tunnel is appropriately policed and colored Coloring refers to marking the packets with the appropriate MPLS EXP bits This color is then used in the core to identify the class to which the packet belongs In the core, the Cisco LowLatency Queuing (LLQ) scheme is deployed to ensure the minimum bandwidth for tunnels of a particular class This allows a service provider to ensure strict priority and an assured amount of bandwidth for voice, while dividing the remaining bandwidth pie into slices, called Class-Based Weighted Fair Queuing (CBWFQ), for the other tunnels and data traffic
Public Network Issues for VoMPLS
Cisco MPLS Fast Reroute (MPLS FRR) Fast reroute is the ability to locally patch traffic onto a backup tunnel in case of a link or node failure with a failover time of 50 ms or lower, which is competitive with SONET Automatic Protection Switching (APS) Cisco FRR utilizes MPLS label stacking with RSVP signaling to create a backup tunnel around the link or node that needs protecting On signal loss detection from the link, the MPLS FRR application in Cisco IOS software starts forwarding the traffic onto the backup tunnel transparent to end users or applications in 50 ms or less Cisco MPLS AutoBandwidth Allocator Cisco IOS software supports another first: an MPLS Traffic Engineering feature, called Cisco AutoBandwidth allocator, to ease constant monitoring and provisioning of the network The AutoBandwidth feature constantly keeps track of average use of the MPLS Traffic Engineering tunnel It can resize TE tunnel bandwidth to suite the traffic flow, efficiently utilizing the available network bandwidth and maximizing profits for service providers The average duration of monitoring is configurable, providing better control of network resources
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