VSC7440 datasheet(167/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

150

An example usage of the counters is shown in the following table.

3.19.3.3 LPM Statistics

For debugging purposes and usage monitoring, the VCAP includes a sticky bit per entry.

3.19.4

IGMP/MLD Snooping Switch

RFC4541 describes recommendations on how an IGMP/MLD snooping switch forwards IP Multicast

packets.

To implement the required data forwarding rules for an IGMP/MLD snooping switch, the VCAP IS2

lookup in ANA_ACL must be used.

For each IP multicast flow, the VCAP IS2 lookup can be used to limit the forwarding within each VLAN

using the following key types:

•

IGMP snooping switch: IP4_VID

•

MLD snooping switch: IP6_VID

Both key types include SIP, DIP, and VID such that snooping switches can be supported for IGMPv3 and

MLDv2.

In the action of the VCAP rules, the following fields can be used to limit the forwarding.

•

PORT_MASK. The ports to which the frame is forwarded within the VLAN.

•

MASK_MODE. Should normally be set to 1 (AND_VLANMASK).

When IP multicast routing is combined with snooping, a lookup in VCAP IS2 is made for each copy of the

IP multicast packet. The VID in each such lookup is the VID of the egress VLAN (of that copy). In order

for the VCAP rules to use the EVID in the IP4_VID/IP6_VID key, the second VCAP lookup must be used,

and ANA_ACL::VCAP_S2_CFG.SEC_ROUTE_HANDLING_ENA must be set to 1.

3.20

VCAP IS2 Keys and Actions

VCAP IS2 is part of ANA_ACL and enables access control lists using VCAP functionality. This section

provides detailed information about all available VCAP IS2 keys and actions.

For information about how to select which key to use and how the VCAP IS2 action is applied, see VCAP

IS2, page 161.

Table 94 •

Egress Router Leg Statistics Example

Event Name

Reference

Counter Name

Byte

(b/)/Frame

(f)

RFC 4293

ipIfStatsOutForwDatagrams f

RFC 4293

ipIfStatsOutOctets

RFC 4293

ipIfStatsOutMcastPkts

RFC 4293

ipIfStatsOutMcastOctets

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