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precedence over other kinds of traffic.
By using DiffServ, traffic is classified based on priority. Then the traffic is forwarded
using one of three IETF-defined per-hop behavior (PHB) mechanisms. This approach
allows traffic with similar service characteristics to be passed with similar traffic
guarantees across multiple networks, even if the multiple networks don't provide the
same service the same way. This is an important feature because the Internet is really
a network of multiple service provider networks.
DiffServ replaces the first bits in the ToS byte with a differentiated services code point
(DSCP). The DSCP is then mapped to the PHB. This technique allows service
providers to control how the DSCP codepoints are mapped to PHBs, and each time a
packet enters a network domain it may be re-marked.
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