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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

122

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TCP/UDP source and destination ports range. Range is matched if either source or destination port

is within range.

Input to the range are the frame’s TCP/UDP source and destination port numbers.

Range is only applicable to TCP/UDP frames.

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VID range

Input to the range is the classified VID.

Range is applicable to all frames.

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DSCP range

Input to the range is the classified DSCP value.

Range is applicable to IPv4 and IPv6 frames.

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EtherType range

Input to the range is the frame’s EtherType.

Range is applicable to all frames.

Range start points and range end points are configured in ANA_CL::ADV_RNG_VALUE_CFG with both

the start point and the end point being included in the range. A range matches if the input value to the

range (for instance the frame’s TCP/UDP destination port) is within the range defined by the start point

and the end point.

3.16.2.6 Cascading VCAP CLM Lookups

Each of the six VCAP CLM lookups can be “cascaded” such that a frame only matches a VCAP CLM

entry in lookup n+1 if it also matched a specific entry in VCAP CLM lookup n. In other words, VCAP CLM

entries in different VCAP CLM lookups are bound together.

The following parameters controls cascading of VCAP CLM entries:

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Key field: G_IDX

The generic index, G_IDX, is available in most VCAP CLM key types. The value of this field can be

specified in the action of the preceding VCAP CLM lookup.

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Action fields: NXT_IDX_CTRL and NXT_IDX

Control how to calculate G_IDX for next VCAP CLM lookup.

For information about detailed encoding of NXT_IDX_CTRL, see Table 65, page 92.

In addition to cascading VCAP CLM lookups, it is also possible for each VCAP CLM lookup to move to

the next protocol layer of the frame, such that key values for lookup n + 1 are retrieved from a different

offset in the frame than for lookup n.

3.16.3

QoS Mapping Table

The following table lists the registers associated with the QoS mapping table.

The classifier contains a shared QoS mapping table with 2,048 entries

(ANA_CL:MAP_TBL:MAP_ENTRY) that maps incoming QoS information to classified internal QoS

information. Inputs to a mapping can be either DEI and PCP from VLAN tags, DSCP value, or MPLS TC

bits. Outputs from a mapping are new classified values for COSID, DEI, PCP, DSCP, QoS class, DP

level, and TC bits. The table is looked up twice for each frame with two different keys.

The QoS mapping table is laid out with 256 rows with each eight mapping entries. Each specific QoS

mapping only uses a subset of the 2,048 entries and it therefore allows for many QoS different mappings

at the same time. It can for instance hold 32 unique mappings from DSCP to DEI/PCP or 128 unique

translations of DEI/PCP to DEI/PCP.

The two lookups per frame in the QoS mapping table are defined by the VCAP CLM actions MAP_IDX

and MAP_KEY. One VCAP CLM match can only define one set MAP_IDX and MAP_KEY so two lookups

in the QoS mapping table requires two VCAP CLM matches. Action MAP_IDX defines which one of the

Table 77 •

VCAP CLM QoS Mapping Table Registers Overview

Description

Replication

ANA_CL:MAP_TBL:SET_CTRL

Controls which mapping results to use.

256

ANA_CL:MAP_TBL:MAP_ENTRY

Configuration of the QoS mapping values.

2,048

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