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VSC7511 Datasheet(PDF) 152 Page - Microsemi Corporation |
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VSC7511 Datasheet(HTML) 152 Page - Microsemi Corporation |
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152 / 324 page  Functional Descriptions VMDS-10488 VSC7511 Datasheet Revision 4.2 137 ES0 tag: VID • Use the classified VID incremented with ES0_ACTION.VID_A_VAL for ES0 tag A and use the classified VID incremented with ES0_ACTION.VID_B_VAL for ES0 tag B. • Use ES0_ACTION.VID_A_VAL for ES0 tag A and use ES0_ACTION.VID_B_VAL for ES0 tag B. ES0 tag: TPID • Use Ethernet type 0x8100 (C-tag). • Use Ethernet type 0x88A8 (S-tag). • Use custom Ethernet type programmed in PORT_VLAN.PORT_TPID. • Use custom Ethernet type programmed in PORT_VLAN.PORT_TPID unless the incoming tag was a C-tag in which case Ethernet type 0x8100 is used. 3.13.1.5 VLAN Pushing In the final VLAN editing step, the VLAN tags derived from the previous steps are pushed to the frame. 3.13.2 DSCP Remarking The following table lists the registers associated with DSCP remarking. The rewriter can remark the DSCP value in IPv4 and IPv6 frames, that is, write a new DSCP value to the DSCP field in the frame. If a port is enabled for DSCP remarking (DSCP_CFG.DSCP_REWR_CFG), the new DSCP value is derived by using the classified DSCP value from the analyzer (the basic classification or the VCAP IS1) in the ingress port. This DSCP value can be mapped before replacing the existing value in the frame. The following options are available: • No DSCP remarking - Leave the DSCP value in the frame untouched. • Update the DSCP value in the frame with the value received from the analyzer • Update the DSCP value in the frame with the value received from the analyzer remapped through DSCP_REMAP_CFG. This is done independently of the value of the drop precedence level. • Update the DSCP value in the frame with the value received from the analyzer remapped through DSCP_REMAP_CFG or DSCP_REMAP_DP1_CFG dependent on the drop precedence level. This enables one mapping for green frames and another for yellow frames so that the resulting DSCP value can reflect the color of the frame. In addition, the IP checksum is updated for IPv4 frames. Note that the IPv6 header does not contain a checksum. As a result, checksum updating does not apply for IPv6 frames. DSCP remarking is not possible for frames where PTP time stamps are also generated and is automatically disabled. 3.13.3 FCS Updating The following table lists the registers associated with FCS updating. Table 107 • DSCP Remarking Registers Register Description Replication DSCP_CFG Selects how the DSCP remarking is done Per port DSCP_REMAP_CFG Mapping table from DSCP to DSCP for DP level = 0. None DSCP_REMAP_DP1_CFG Mapping table from DSCP to DSCP for DP level = 1. None Table 108 • FCS Updating Registers Register Description Replication PORT_CFG.FCS_UPDATE_NONCPU_CFG FCS update configuration for non-CPU injected frames. Per port |
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