Enterprise Network with Traditional Layer 2 Service

Provider sells the customer a Layer 2 service

Point-to-point SLA from the provider

Enterprise WAN likely to get congested

QoS required for voice, video, data integration

Service provider is not involved in QoS

Provider sells the customer a Layer 2 service

Point-to-point SLA from the provider

Enterprise WAN likely to get congested

QoS required for voice, video, data integration

Service provider is not involved in QoS

This figure illustrates a service provider providing only Layer 2 services to the enterprise customer. The customer edge (CE) routers at the various customer sites are interconnected by Frame Relay virtual circuits (VCs). These VCs can be fully meshed, partially meshed, or set up as hub-and-spokes, depending on the customer requirements.

In this environment, the service provider is only responsible for the end-to-end Layer 2 VC connections. The service provider only provides a point-to-point SLA guarantee for each VC connection, and is not involved with providing QoS to the customer.

To provide QoS for voice, video, and data integration over the Frame Relay VCs, the customer must configure the proper QoS mechanisms such as traffic shaping, low-latency queuing (LLQ), FRF. 12, and compressed Real-Time Transport Protocol (cRTP) at the WAN customer edge (CE) routers, because the Frame Relay WAN link is likely to become congested.

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