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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

163

3.21.1.2 VCAP IS2 Custom Keys

VCAP IS2 supports two custom keys, CUSTOM_1 and CUSTOM_2. Custom keys extract raw data from

the frame at one selectable location. The custom keys enable matching against protocol fields not

supported by other VCAP IS2 keys. The use of the custom keys must be enabled through a VCAP CLM

FULL action using CUSTOM_ACE_ENA and CUSTOM_ACE_OFFSET.

CUSTOM_1 extracts 57 consecutive bytes of data from the frame and CUSTOM_2 extracts 24

consecutive bytes of data from the frame. The data is extracted at one of four different positions in the

frame. For frames of frame_type ETH (IFH.TYPE_AFTER_POP), the positions are defined as:

•

Link layer. Corresponds to first byte in DMAC.

•

Link layer payload. Corresponds to first byte in L3, after VLAN tags and EtherType.

•

Link layer payload plus 20 bytes. Corresponds to first byte in L4 for IPv4 frame.

•

Link layer payload plus 40 bytes. Corresponds to first byte in L4 for IPv6 frame.

For frames of frame_type CW, the first link layer position is not available. The positions are defined as:

•

Link layer payload. Corresponds to first byte in control word for non-IP frames and first byte in IP

header for IP frames.

•

Link layer payload plus 20 bytes. Corresponds to first byte in L4 for IPv4 frame.

•

Link layer payload plus 40 bytes. Corresponds to first byte in L4 for IPv6 frame.

3.21.1.3 VCAP IS2 Range Checkers

The following table lists the registers associated with configuring VCAP IS2 range checkers.

Eight global VCAP IS2 range checkers are supported by the IP4_TCP_UDP and IP_7TUPLE keys. All

frames using these keys are compared against the range checkers and a 1-bit range “match/no match”

flag is returned for each range checker. The combined eight match/no match flags are used in the

L4_RNG key field. So, it is possible to include for example ranges of DSCP values and/or ranges of TCP

source port numbers in the ACLs.

Note, VCAP CLM also supports range checkers but they are independent of the VCAP IS2 range

checkers.

The range key is generated for each frame based on extracted frame data and the configuration in

ANA_ACL::VCAP_S2_RNG_CTRL. Each of the eight range checkers can be configured to one of the

following range types:

•

TCP/UDP destination port range

Input to the range is the frame’s TCP/UDP destination port number.

Range is only applicable to TCP/UDP frames.

•

TCP/UDP source port range

Input to the range is the frame’s TCP/UDP source port number.

Range is only applicable to TCP/UDP frames.

•

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.

•

VID range

Input to the range is the classified VID.

Range is applicable to all frames.

Table 101 •

VCAP IS2 Range Checker Configuration

Description

Replication

ANA_ACL::VCAP_S2_RNG_CTRL

Configuration of the range checker types

Per range checker

ANA_ACL::VCAP_S2_RNG_VALUE_CFG

Configuration of range start and end points

Per range checker

ANA_ACL::VCAP_S2_RNG_OFFSET_CFG Offset into frame when using a range checker

based on selected value from frame

None

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