VSC7440 datasheet(199/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

182

•

SRC_KILL (LRN::AUTO_LRN_CFG.AUTO_LRN_SRC_KILL_FWD)

•

IGNORE_VLAN (LRN::AUTO_LRN_CFG.AUTO_LRN_IGNORE_VLAN)

•

MIRROR (LRN::AUTO_LRN_CFG.AUTO_LRN_MIRROR)

•

AGE_INTERVAL (LRN::AUTO_LRN_CFG.AUTO_AGE_INTERVAL)

•

All other fields are cleared

When a frame is received from a known station, that is, the MAC table already contains an entry for the

received frame’s (SMAC, VID/FID), the analyzer clears the AGED_FLAG for unlocked entries (LOCKED

flag cleared) and optionally, locked entries (ANA_L2:COMMON:LRN_CFG.AGE_LOCKED_ENA). A

cleared AGE_FLAG implies that the station is active. For more information, Automated Aging

(AUTOAGE), page 183.

For unlocked entries, ADDR_TYPE and ADDR fields are compared against the following:

•

UPSID_PN if received on a non aggregated port

•

GLAG if received on a global aggregated port

If there is a difference, the source entry ADDR_TYPE and ADDR is updated, which implies the station

has moved to a new port.

Source check for entries stored with ADDR_TYPE=MC_IDX (=3) can be ignored

(ANA_L2::LRN_CFG.IGNORE_MCIDX_PORTMOVE_ENA).

3.22.6.2 Port Move Log

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

information (ADDR_TYPE and ADDR). Such an event is logged and reported (in

ANA_L2::MOVELOG_STICKY) by setting the bit corresponding to the new port.

If port moves continuously occurs, it may indicate a loop in the network or a faulty link aggregation

configuration.

Port moves for locked entries can be detected in

ANA_L2::LRN_CFG.LOCKED_PORTMOVE_DETECT_ENA.

3.22.6.3 Port Learn Limits

It is possible to specify the maximum number of entries in the MAC table per port.

Port limits can be specified per logical port (local link aggregated port) and per global link aggregated

port (GLAG) (ANA_L2:PORT_LIMIT:PORT_LIMIT_CTRL.PORT_LRN_CNT_LIMIT). These limits do not

take multicast into account.

The current number of learned entries are always available in

ANA_L2:PORT_LIMIT:PORT_LIMIT_STATUS.PORT_LRN_CNT and are updated whenever either an

automatic learn operation or a CPU access is performed.

After a limit is reached, both automatic learning and CPU-based learning of unlocked entries are denied.

A learn frame to be learned when the limit is reached can selectively be discarded, redirected to CPU, or

copied to CPU (controlled in ANA_L2:PORT_LIMIT:PORT_LIMIT_CTRL.PORT_LIMIT_EXCEED_SEL).

Trying to exceed the configured limit can also trigger interrupt

(ANA_L2:PORT_LIMIT:PORT_LIMIT_CTRL.PORT_LIMIT_EXCEED_IRQ_ENA).

When learn limits are exceeded, a corresponding sticky bit is set

(ANA_L2:PORT_LIMIT:PORT_LIMIT_STATUS.PORT_LRN_LIMIT_EXCEEDED_STICKY).

If a MAC table entry interrupt moves from one port to another port, it is also reflected in the current

number of learned entries.

3.22.6.4 Filtering Identifier Learn Limits

It is possible to specify the maximum number of entries to be used per FID

(ANA_L2:LRN_LIMIT:FID_LIMIT_CTRL.FID_LRN_CNT_LIMIT). These limits do not take multicast into

account.

The current number of learned entries are always available in

ANA_L2:LRN_LIMIT:FID_LIMIT_STATUS.FID_LRN_CNT.

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