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VSC7511 Datasheet(PDF) 148 Page - Microsemi Corporation |
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VSC7511 Datasheet(HTML) 148 Page - Microsemi Corporation |
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148 / 324 page  Functional Descriptions VMDS-10488 VSC7511 Datasheet Revision 4.2 133 3.12.5.2 Strict and Work-Conserving Shaping Example • Output from scheduler element is shaped down to 500 Mbps. • All queues are strict. • All queues are shaped to 50 Mbps. • Queues 6 and 7 are work-conserving (allowed to use excess bandwidth). • All queues receive 125 Mbps of traffic each. The following table lists the resulting egress bandwidth for the various queues. 3.13 Rewriter The device includes a rewriter common for all ports that determines how the egress frame is edited before transmission. The rewriter performs the following editing: • VLAN editing; tagging of frames and remapping of PCP and DEI. • DSCP remarking; rewriting the DSCP value in IPv4 and IPv6 frames based on classified DSCP value. • FCS updating. • Precision Time Protocol time stamp updating. Each port module including the CPU port module (CPU port 11 and CPU port 12) has its own set of configuration in the rewriter. Each frame is handled by the rewriter one time per destination port. Most rewriting functions in the rewriter are independent of each other and can co-exist. For instance, a frame can be VLAN tagged while at the same time being DSCP remarked. However, precision time protocol time stamp updating and DSCP remarking are mutually exclusive with the former taking precedence. If an IS2 action returns any PTP actions then DSCP remarking is automatically disabled for the frame. 3.13.1 VLAN Editing The following table lists the registers associated with VLAN editing. Table 104 • Example of Strict and Work-Conserving Shaping Queue Result: Egress Bandwidth Q0 50 Mbps Q1 50 Mbps Q2 50 Mbps Q3 50 Mbps Q4 50 Mbps Q5 50 Mbps Q6 75 Mbps (Gets the last 25 Mbps of the 100 Mbps in excess not used by queue 7) Q7 125 Mbps (Gets 75 Mbps of the 100 Mbps in excess limited only by the received rate) Sum: 500 Mbps Table 105 • VLAN Editing Registers Register Description Replication PORT_VLAN_CFG Port VLAN for egress port. Used for untagged set Per port TAG_CFG Tagging rules for port tag Per port PORT_CFG.ESO_ENA Enable lookups in ES0 Per port PCP_DEI_QOS_MAP_CFG Mapping table Maps DP level and QoS class to new PCP and DEI values Per port per QoS per DP |
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