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Configuring Differentiated Services

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• Manually configure them on the edge router.

You can create filters that instruct the router to mark specific packets for

special service throughout the network. If you manually configure filters,

there is no need for a bandwidth broker or policy server.

Implementing a differentiated depends on your specific network requirements. If

you implement differentiated services with a bandwidth broker, you have more

flexibility and control over your network, but you have the cost and effort of

maintaining a server. Conversely, if you manually configuring filters, this requires

a lot of work because you must configure each router separately, but you do not

have the added cost of maintaining a server.

Components of a Differentiated Services Network

The following devices comprise a differentiated services network:

•Host

Resides at the sending and receiving point in the network. The host is the

device that requests service from the network.

• Bandwidth Broker

The bandwidth broker typically resides in the ISP or enterprise network. Its

primary function is to act as a resource manager, keeping records of all the

reserved data flows and filters and managing bandwidth allocation.

The bandwidth broker installs trigger and flow filters on the edge router.

These filters tell the router how to process incoming packets. The trigger filter

detects the beginning of a traffic flow and notifies the bandwidth broker. The

flow filter identifies packets that belong to a specific data flow and designates

how packets that match the filter should be marked. The edge device and the

bandwidth broker communicate using the COPS protocol.

The bandwidth broker may also be called the COPS server because COPS is

the protocol used for communication between the broker and the edge router.

Not all differentiated services networks have a bandwidth broker. If no

bandwidth broker exists, you must configure filters on the edge device.

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Avaya Configuring Differentiated Services Manual de usuario Pagina 20