VSC7440 datasheet(181/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

164

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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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Selected frame field range

Input to the range is a selected 16-bit wide field from the frame. The field is selected using the offset

value configured in ANA_ACL::VCAP_S2_RNG_OFFSET_CFG. The offset starts at the Type/Len

field in the frame after up to 3 VLAN tags have been skipped. Note that only one selected value can

be configured for all eight range checkers.

Range is applicable to all frames.

Range start points and range end points are configured in ANA_ACL::VCAP_S2_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.

3.21.1.4 Miscellaneous VCAP IS2 Key Configurations

The following table lists the registers associated with configuration that control the specific fields in the

VCAP IS2 keys.

By default, the field VID contains the frame’s classified VID for both VCAP IS2 lookups. Routable frames

(determined by ANA_L3) with field L3_RT=1, can be configured

(ANA_ACL::VCAP_S2_CFG.SEC_ROUTE_HANDLING_ENA) to use the IRLEG VID for the first lookup

in VCAP IS2 and ERLEG VID for the second lookup. This enables ACL rules that apply to the ingress

router leg and ACL rules that apply to the egress router leg. The IRLEG VID and ERLEG VID are

provided by ANA_L3.

All VCAP IS2 keys except IP4_VID and IP6_VID contain the field IGR_PORT_MASK_SEL and

IGR_PORT_MASK. For frames received on a front port, IGR_PORT_MASK_SEL is set to 0 and the bit

corresponding to the frame’s physical ingress port number is set in IGR_PORT_MASK. The following

lists some settings for frames received on other interfaces and how this can be configured through

•

Loopback frames. By default, IGR_PORT_MASK_SEL = 1 and IGR_PORT_MASK has one bit set

corresponding to the physical port which the frame was looped on. Optionally use

IGR_PORT_MASK_SEL = 3.

•

Masqueraded frames. By default, IGR_PORT_MASK_SEL=0 and IGR_PORT_MASK has one bit

set corresponding to the masquerade port. Optionally, use IGR_PORT_MASK_SEL = 2.

•

Virtual device frames. By default, IGR_PORT_MASK_SEL=0 and IGR_PORT_MASK has one bit

set corresponding to the original physical ingress port. Optionally use IGR_PORT_MASK_SEL = 3.

•

CPU injected frames. By default, IGR_PORT_MASK_SEL = 0 and IGR_PORT_MASK has none

bits set. Optionally use IGR_PORT_MASK_SEL = 3.

For more information about the contents of IGR_PORT_MASK_SEL and IGR_PORT_MASK, see VCAP

IS2 Key Overview, page 151.

3.21.1.5 Processing of VCAP IS2 Actions

VCAP IS2 returns an action for each enabled VCAP IS2 lookup. If the lookup matches an entry in VCAP

IS2 then the associated action is returned. A default action is returned when no entries are matched. The

first VCAP IS2 lookup returns a default action per physical ingress port while the second VCAP IS2

lookup returns a common default action. There is no difference between an action from a match and a

default action.

Table 102 •

Other VCAP IS2 Key Configurations

Description

Replication

ANA_ACL::VCAP_S2_CFG.SEC_ROUTE_HA

NDLING_ENA

Enables use of IRLEG VID and ERLEG VID

instead of classified VID.

Per port

ANA_ACL:VCAP_S2:VCAP_S2_MISC_CTRL

Configuration of IGR_PORT_MASK_SEL and

IGR_PORT_MASK.

None

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