VSC7511 datasheet(133/324 Pages) MICROSEMI

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Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

118

The following adjustment is made to the forwarding decision for frames subject to mirroring:

•

Ports set in MIRRORPORTS are added to DEST.

If the CPU port is set in the MIRRORPORTS, CPU extraction queue CPUQ_CFG.CPUQ_MIRROR is

added to the CPUQ.

For learn frames with learning enabled, all ports in ADVLEARN.LEARN_MIRROR are added to DEST.

For more information, see SMAC Analysis, page 114.

For more information about mirroring, see Mirroring, page 249.

Finally, if AGENCTRL.CPU_CPU_KILL_ENA is set, the CPU port is removed if the ingress port is the

CPU port itself. This is similar to source port filtering done for front ports and prevents the CPU from

sending frames back to itself.

3.9.4

Analyzer Monitoring

Miscellaneous events in the analyzer can be monitored, which can provide an understanding of the

events during the processing steps. The following table lists the registers associated with analyzer

monitoring.

Port moves, defined as a known station moving to a new port, are registered in the ANMOVED register.

A port move occurs when an existing MAC table entry for (MAC, VID) is updated with new port

information (DEST_IDX). Such an event is registered in ANMOVED by setting the bit corresponding to

the new port.

Continuously occurring port moves may indicate a loop in the network or a faulty link aggregation

configuration.

A list of events, such as frame flooding or policer drop, can be monitored in ANEVENTS.

The LEARNDISC counter registers every time an entry in the MAC table cannot be made or if an entry is

removed due to lack of storage.

3.10

Policers

The device has 192 policers that can be allocated to ingress ports, QoS classes per port, and VCAP IS2

entries. The policers limit the bandwidth of received frames by discarding frames exceeding configurable

rates. All policers are MEF compliant dual leaky bucket policers that are capable of handling committed

and excess peak information rates.

Each frame can hit up to three policers: One port policer, one VCAP policer and one QoS policer. The

order in which the policers are applied to a frame is programmable.

In addition to the policers, the device also supports a number of storm policers and an egress scheduler

with shaping capabilities. For more information, see Storm Policers, page 116 and Scheduler and

Shapers, page 128.

The following table lists the registers associated with policer control.

Table 94 •

Analyzer Monitoring

Description

Replication

ANMOVED

ANMOVED[n] is set when a known station has moved to port n.

None

ANEVENTS

Sticky bit register for various events.

None

LEARNDISC

The number of learn events that failed due to a lack of storage

space in the MAC table.

None

Table 95 •

Policer Control Registers

Description

Replication

ANA:PORT:POL_CFG

Enables use of port and QoS policers

Per port

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