VSC7440 datasheet(223/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

206

Rx and Tx sampling can be enabled independently. If both are enabled, all incoming and outgoing traffic

on the port is subject to the statistical sampling given by the rate in SFLOW_SAMPLE_RATE.

sFlow sample candidate sent to the CPU is sent with IFH.FWD.SFLOW_MARKING set and with FCS

updated as shown in the following illustration.

Figure 51 •

sFlow Stamp Format in FCS

SAMPLE_CNT is incremented for each sample sent to CPU by the sFlow sampler.

FRAME_FWD_CNT is incremented whenever the frames are applicable for an sFlow sampler.

A variety of sticky events allows debug of the sFlow setup. These events can furthermore be counted in

the port statistics block by enabling the corresponding *_MASK. The following events are reported (in

ANA_AC:PS_STICKY:STICKY).

•

sFlow candidate was found (ANA_AC:PS_STICKY:STICKY.SFLOW_CAND_STICKY).

•

sFlow source sample was sent to CPU

(ANA_AC:PS_STICKY:STICKY.SFLOW_SRC_SAMPLE_STICKY).

•

sFlow destination sample was sent to CPU

(ANA_AC:PS_STICKY:STICKY.SFLOW_DST_SAMPLE_STICKY).

Current sample count and sample candidate count numbers are available

(ANA_AC::SFLOW_CNT.SFLOW_SAMPLE_CNT and

ANA_AC::SFLOW_CNT.SFLOW_FRAME_FWD_CNT).

These events can all be counted in the statistics block by enabling the corresponding *STICKY_MASK

found in register group ANA_AC:PS_STICKY_MASK:STICKY_MASK[x].

(ANA_AC:PS_STICKY_MASK:STICKY_MASK.SFLOW_CAND_STICKY_MASK,

ANA_AC:PS_STICKY_MASK:STICKY_MASK.SFLOW_DST_SAMPLE_STICKY_MASK,

ANA_AC:PS_STICKY_MASK:STICKY_MASK.SFLOW_SRC_SAMPLE_STICKY_MASK and

ANA_AC:PS_STICKY_MASK:STICKY_MASK.SFLOW_SAMPLE_STICKY_MASK).

3.23.5

Mirroring

This section describes how to configure mirroring. The following table lists the applicable registers.

Table 133 •

ANA_AC Mirror Registers Overview

Target::Register.Field

Description

Replication

ANA_AC:MIRROR_PROBE:PROBE

_CFG.PROBE_DIRECTION

Configures whether to probe ingress traffic, egress traffic, or

both.

ANA_AC:MIRROR_PROBE:PROBE

_CFG.PROBE_MAC_MODE

Configures MAC address filtering i.e. only traffic to and/or from

hosts known in to MAC table with the mirror bit set are mirrored.

ANA_AC:MIRROR_PROBE:PROBE

_CFG.PROBE_VLAN_MODE

Configures VLAN filtering. That is, only traffic with a specific VID

or with VLAN entry mirror bit set are mirrored.

ANA_AC:MIRROR_PROBE:PROBE

_CFG.PROBE_VID

Configures VID when PROBE_VLAN_MODE is set to probe

VID.

ANA_AC:MIRROR_PROBE:PROBE

_CFG.PROBE_CPU_SET

Configures mirroring of traffic to specific CPU ports.

Without sample ID in stamp

0 :bit position

FRAME_FWD_CNT

SAMPLE

CNT

With sample ID in stamp

FRAME_FWD_CNT

SAMPLE

CNT

SAMPLE

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