| | RFC3270 (Site not responding. Last check: 2007-11-04) |
 | | The mapping from the EXP field to the PHB (i.e., to PSC and drop precedence) for a given such LSP, is either explicitly signaled at label set-up or relies on a pre-configured mapping. |
 | | For the purpose of specifying Diff-Serv over MPLS forwarding, we simply note that the PHB to be actually enforced and conveyed to downstream LSRs by an LSR (referred to as "outgoing PHB"), may be different to the PHB which had been associated with the packet by the previous LSR (referred to as "incoming PHB"). |
 | | In particular, if a mapping from PHBs to DE is standardized in the future for operations of Diff-Serv over Frame Relay, such a standardized mapping may then be used. |
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