VSC7440 datasheet(198/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

181

These actions are controlled independently. In other words, it is possible to send a CPU copy as well as

disable normal forwarding.

Figure 39 •

Source Check

The source lookup is also used to clear an Age flag (used as activity indication) in the MAC table to allow

inactive MAC table entries to be pruned.

Port move detection is not performed for locked MAC table entries unless enabled

(ANA_L2::LRN_CFG.LOCKED_PORTMOVE_DETECT_ENA).

Frames failing locked port move detection can be copied to CPU queue

(ANA_L2::LRN_CFG.CPU_LRN_QU and ANA_L2::LRN_CFG.LOCKED_PORTMOVE_COPY_ENA).

3.22.6.1 Automatic Learning

The device can automatically add or update entries in the MAC table. New entries added by automatic

learning are formatted as follows.

•

VLD is set

•

MAC is set to the frame’s SMAC address

•

FID set to the frame’s REQ.FID

•

ADDR_TYPE, ADDR is set to:

UPSID_PN if received on a non aggregated port

GLAG if received on a global aggregated port

•

MAC_CPU_COPY (LRN::AUTO_LRN_CFG.AUTO_LRN_CPU_COPY)

•

MAC_CPU_QU (LRN::AUTO_LRN_CFG.AUTO_LRN_CPU_QU)

false

Put mac_entry into auto LRN queue

false

# CPU copy of learn frames?

ANA_L2::LRN_COPY_CFG[req.port_num]==1?

req.cpu_dest_set(ANA_L2::LRN_CFG.C

PU_LRN_QU) := 1

true

# Secure port forwarding?

ANA_L2::LRN_SECUR_CFG[req.port_num]==1?

req.l2_fwd := 0

req.vlan_mask := 0

false

true

Learn handling done

# Secure VLAN forwarding?

req.vlan_sec_fwd_ena==1?

false

# MAC entry found?

mac_entry.vld=1?

# Port move detection?

mac_entry.addr_type == src_addr.type &&

mac_entry.addr == src_addr.addr?

true

false

# Create MAC entry

# Automatic learning?

ANA_L2::AUTO_LRN_CFG[req.port_num]==1?

mac_entry.addr_type := src_addr.type

mac_entry.addr := src_addr.addr

false

Source MAC lookup performed

# CPU copy based on source lookup?

mac_entry.cpu_copy &&

ANA_L2::LRN_CFG.CPU_SMAC_COPY_ENA?

req.cpu_dest_set(mac_entry.cpu_qu) := 1

true

false

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