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Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

117

3.9.3.7

sFlow Sampling

This process step handles sFlow sampling. The following table lists the registers associated with sFlow

sampling.

sFlow is a standard for monitoring high-speed switch networks through statistical sampling of incoming

and outgoing frames. Each port in the device can be setup as an sFlow agent monitoring the particular

link and generating sFlow data. If a frame is sFlow sampled, it is copied to the sFlow CPU extraction

queue (CPUQ_SFLOW).

An sFlow agent is configured through SFLOW_CFG with the following options:

•

SF_RATE specifies the probability that the sampler copies a frame to the CPU. Each frame being

candidate for the sampler has the same probability of being sampled. The rate is set in steps of

1/4096.

•

SF_SAMPLE_RX enables incoming frames on the port as candidates for the sampler.

•

SF_SAMPLE_TX enables outgoing frames on the port as candidates for the sampler.

The Rx and Tx 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 SF_RATE.

3.9.3.8

Mirroring

This processing step handles mirroring. The following table lists the registers associated with mirroring.

Frames subject to mirroring are identified based on the following mirror probes:

•

Learn mirroring if ADVLEARN.LEARN_MIRROR is set and frame is a learn frame.

•

CPU mirroring if AGENCTRL.MIRROR_CPU is set and the CPU port is set in DEST.

•

Ingress mirroring if PORT_CFG.SRC_MIRROR_ENA is set.

•

Egress mirroring if any port set in EMIRRORMASK is also set in DEST.

•

VLAN mirroring if VLAN_MIRROR set in the VLAN table entry.

•

VCAP mirroring if an action is hit that requires mirroring.

Table 92 •

sFlow Sampling Registers

Description

Replication

SFLOW_CFG

Configures sFlow samplers (type and rates).

Per port

CPUQ_CFG.CPUQ_SFLOW CPU extraction queue for sFLow sampled frames.

None

Table 93 •

Mirroring Registers

Description

Replication

ADVLEARN.LEARN_MIRROR

For learn frames, ports in this mask (mirror

ports) are added to DEST.

None

AGENCTRL.MIRROR_CPU

Mirror all frames forwarded to the CPU port

module.

None

PORT_CFG.SRC_MIRROR_ENA

Mirror all frames received on an ingress port

(ingress port mirroring).

Per port

EMIRRORMASK

Mirror frames that are to be transmitted on any

ports set in this mask (egress port mirroring).

None

VLANTIDX.VLAN_MIRROR

Mirror all frames classified to a specific VID.

Per VLAN

IS2_ACTION.MIRROR_ENA

Mirror when an IS2 action is hit.

Per VCAP IS2

entry

MIRRORPORTS

When mirroring a frame, ports in this mask are

added to DEST.

None

AGENCTRL.CPU_CPU_KILL_ENA Clear the CPU port if source port is the CPU

port and the CPU port is set in DEST.

None

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