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Differentiated Services Overview
308620-14.00 Rev 00
1-3
Policy server
The policy server resides inside the ISP or enterprise network. It provides
policy admission control, which administrates network services and user
authentication functions. The policy server monitors which data flows are
assigned to a user and whether an application should have network access. In
addition, the policy server polices data flows so it can limit the amount of
high-priority traffic in the network. This prevents network resources from
becoming overburdened.
In some networks, the bandwidth broker is the same device as the policy
server; however, they can be different devices.
Not all differentiated services networks use a policy server.
Edge router
The edge router resides at the edge of the network. Its function is to classify
data flows and mark them by setting the DS field in the IP header. The DS
field designates a specific type of service to each packet and instructs the
network how to process the packet.
Core network device
The core network device, which is typically a high-performance router,
resides in the ISP or enterprise network. It routes data along the appropriate
path through the network. This router cannot classify packets itself.
•Server Manager
The server manager, which resides outside the network, sets up video
conferences. The server manager sometimes acts as the intermediary between
the host and the bandwidth broker, passing on the host’s requests to the
bandwidth broker. The server manager is not a required part of a differentiated
services network.
Figure 1-1
shows a differentiated services network that includes a server manager
and a bandwidth broker. If you manually configure filters, the bandwidth broker
and server manager would not be included.
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