MicroNet SP5004 Manuale Utente Scaricare il pdf (Pagina 55)

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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MicroNet SP5004 Manuale Utente Pagina 55