Service management and QoS

Overview

The NFM-P supports the configuration of the following network services:

  • virtual leased line (VLL) service

  • virtual private LAN service (VPLS) / management virtual private LAN service (MVPLS) / hierarchical virtual private LAN service (HVPLS)

  • internet enhanced service (IES)

  • virtual private routed network (VPRN) service

  • virtual LAN (VLAN) service

  • composite service

  • mirror service

An NFM-P operator can create, configure and delete services on sites and routers that are within their span of control.

An administrator can configure NFM-P system preferences related to service creation and deletion; see the procedure to configure NFM-P system preferences in the NSP System Administrator Guide.

The benefits of the NFM-P service model include:

Customer traffic enters a service through one or more access interfaces. In a local service, all access interfaces are on one NE. In a distributed service, multiple NEs are deployed at the PE. Customer traffic is transported across an IP/MPLS core network in unidirectional service tunnels that use GRE or MPLS LSPs. Many services can use the same tunnel.

Figure 70-1: Distributed VLL service
Distributed VLL service
Figure 70-2: Distributed VPLS
Distributed VPLS

For IES, the managed devices are deployed at the provider edge and customer traffic enters the service using access interfaces. IES is a routed connectivity service where the customer communicates with an IP router interface to send and receive Internet traffic.

Figure 70-3: Sample IES
Sample IES

For VPRN services, the managed devices can be deployed as PE or provider core routers. Data and routing information are forwarded across an IP/MPLS service provider core network.

Figure 70-4: Sample VPRN service
Sample VPRN service

VLAN ring groups are used to send traffic across an Ethernet ring using copper or fiber optic connections from the source traffic device, for example, a 7450 ESS, to all devices in the ring. Any breaks in the physical links between devices are rerouted.

Figure 70-5: Sample VLAN configuration for L2 VPNs
Sample VLAN configuration for L2 VPNs

A composite service allows the interconnection of different service types to form a service delivery network that is tailored to a specific application. For example, VPRN, VPLS, and VLAN services can be joined to create a routed multicast TV distribution mechanism that spans a wide geographical area.

A mirror service is a unidirectional service function that duplicates a specified traffic stream and sends the duplicate stream to a monitoring device for troubleshooting or surveillance purposes. With pseudo-wire redundancy support, an ICB can be enabled in a mirror service spoke and a remote source, which can provide bidirectional service that enables support for active and standby PE redundancy.

QoS provides the ability to rate limit across multiple queues from one or more access interfaces for a customer, and to differentiate service levels for different types of traffic. For higher priority traffic such as VoIP or video, you can specify reserved bandwidth. Lower priority applications, such as data traffic, may not have reserved bandwidth but can burst to use all the available bandwidth.

The main elements of QoS are:

See Chapter 49, Policies overview for more information about policies on the NFM-P. See the 7750 SR OS Services Guide for more detailed information about QoS.