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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

110

Figure 25 •

Basic DSCP Classification Flow Chart

Note that the DSCP translation part is common for both QoS, DP, and DSCP classification, and the

DSCP trust part is common for both QoS and DP classification.

The basic classifier has the option to overrule rewriter configuration (REW:PORT:DSCP_MAP) that

remaps the DSCP value at egress. When ANA_CL:PORT:QOS_CFG.DSCP_KEEP_ENA is set, the

rewriter is instructed not to modify the frame’s DSCP value (IFH.QOS.TRANSP_DSCP is set to 1).

The basic classified QoS, DP, and DSCP can be overwritten by more intelligent decisions made in the

VCAP CLM.

3.16.1.6 VLAN Classification

The following table lists the registers associated with VLAN classification.

Table 70 •

VLAN Configuration Registers

Description

Replication

ANA_CL:PORT:VLAN_CTRL

Configures the port’s processing of VLAN information in

VLAN-tagged and priority-tagged frames. Configures the

port-based VLAN.

Per port

DSCP = 0

”Frame is IPv4 or IPv6"

DSCP_TRANSLATE_ENA[port]

DSCP = Frame.DSCP

DSCP =

DSCP_TRANSLATE_VAL[DSCP]

DSCP_REWR_MODE_SEL[port] == ”Rewrite all” or

DSCP_REWR_MODE_SEL[port] == Rewrite DSCP=0" and DSCP == 0 or

DSCP_REWR_MODE_SEL[port] == ”Rewrite selected” and DSCP_REWR_ENA[DSCP]

DSCP = DSCP_REWR_VAL[8 x Basic classified DP level + Basic classified QOS class]

Basic classified DSCP

(IFH.QOS.DSCP)

Basic classified QoS class

Basic classified DP level

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