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VSC7440 Datasheet(PDF) 283 Page - Microsemi Corporation |
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VSC7440 Datasheet(HTML) 283 Page - Microsemi Corporation |
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283 / 444 page  Functional Descriptions VMDS-10492 VSC7440 Datasheet Revision 4.2 266 • Use fixed value. Special Tag A+B: VID • Use fixed value. Special Tag A+B: TPID • Use Ethernet type 0x8100 (C-tag). • Use Ethernet type 0x88A8 (S-tag). • Use one of three custom TPIDs programmed in REW::TPID_CFG.TPID_VAL. • TPID is classified by ANA and selected by means of IFH. 3.26.8 DSCP Remarking The rewriter supports two DSCP remarking schemes. The first remarking mode is controlled by port and IFH settings. The second remarking mode is controlled by ES0 actions and by the general mapping tables. DSCP actions from ES0 override any remarking done by the port. 3.26.8.1 ES0-Based DSCP Remarking ES0 controls DSCP remarking if ES0 lookups are enabled and the DSCP_SEL action is different from 0. For more information, see Mapping Tables, page 259. 3.26.8.2 Legacy Port-Based Mode Simple DSCP remapping can be done using a common table shared by all ports. The following table shows the port-based DSCP editing registers associated with remarking. The following remarking options are available. • No DSCP remarking. The DSCP value in the frame is untouched. • Update the DSCP value in the frame with the value received from the analyzer in IFH.QOS.DSCP. • Update the DSCP value in the frame with the frame DSCP mapped through DSCP_REMAP.DSCP_REMAP. • Update the DSCP value in the frame with the value received from the analyzer (IFH.QOS.DSCP) mapped through DSCP_REMAP.DSCP_REMAP. ANA can set IFH.QOS.TRANSPARENT_DSCP to prevent DSCP mapping even if this is enabled for a port. ANA can also force use of the frame DSCP for mapping by setting IFH.QOS.UPDATE_DSCP to 0. The IP checksum is updated when changing the DSCP for IPv4 frames. Table 185 • Port-Based DSCP Editing Registers Register Description Replication DP_MAP.DP Maps the four drop precedence levels to a drop eligible value (DE). DE is also called color. Global DSCP_REMAP.DSCP_REMAP Full one-to one DSCP remapping table common for all ports. None DSCP_MAP.DSCP_UPDATE_ENA Selects DSCP from either frame or IFH.QOS.DSCP. If DSCP_MAP.DSCP_UPDATE_ENA = 1 and IFH.QOS.UPDATE_DSCP = 1: Selected DSCP = IFH.QOS.DSCP Else keep frame DSCP: Selected DSCP = Frame DSCP. Ports DSCP_MAP.DSCP_REMAP_ENA Optionally remaps selected DSCP. If DSCP_MAP.DSCP_REMAP_ENA = 1 and IFH.QOS.TRANSPARENT_DSCP = 0: New DSCP = DSCP_REMAP [Selected DSCP]. Else do no remap: New DSCP = selected DSCP. Ports |
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