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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

179

3.22.5.1 DMAC-Based Forwarding

The analyzer performs destination lookup in the MAC table to determine if the destination MAC address

is known or unknown.

•

If the destination is unknown, a flood forwarding decision is made if forwarding from unknown

sources is allowed (ANA_L3:VLAN:VLAN_CFG.VLAN_SEC_FWD_ENA). The associated flood

masks are located in the PGID table.

•

If the destination address is known, the associated ADDR_TYPE and ADDR stored in the

destination entry is used to find the destination port or ports in the PGID table.

Flooded traffic can be made available for mirroring

(ANA_L2:COMMON:FWD_CFG.FLOOD_MIRROR_ENA) and CPU copying

(ANA_L2:COMMON:FWD_CFG.FLOOD_CPU_COPY_ENA

ANA_L2:COMMON:FWD_CFG.CPU_DMAC_QU).

Traffic with known DMAC and VLAN_IGNORE set

LRN:COMMON:MAC_ACCESS_CFG_2.MAC_ENTRY_VLAN_IGNORE for CPU learned frames or

LRN:COMMON:AUTO_LRN_CFG.AUTO_LRN_IGNORE_VLAN for auto learned entries) and optionally

also flooded traffic (when ANA_L2:COMMON:FWD_CFG.FLOOD_IGNORE_VLAN_ENA set) can be

configured to ignore VLAN port mask or source port mask

(ANA_L2:COMMON:FWD_CFG.FILTER_MODE_SEL).

The DMAC lookup of the received {DMAC, EFID} in the MAC table is shown in the following illustration.

Figure 38 •

DMAC Lookup

false

vlan_ignore?

false

req.l2_fwd := 0

req.vlan_mask := 0

true

DMAC handling done

# MAC entry found?

mac_entry.vld=1?

true

false

# Use info from MAC entry

req.dst_addr_type := mac_entry.addr_type

req.dst_addr := mac_entry.addr

vlan_ignore := mac_entry.vlan_ignore

req.dmac_mirror := mac_entry.mirror

false

# CPU copy?

ANA_L2::FWD_CFG.CPU_DMAC_COPY_ENA &&

mac_entry.cpu_copy?

req.cpu_dest_set(mac_entry.cpu_qu) := 1

true

# Allow VLAN flooding?

req.vlan_flood_dis==1?

# Use flood configuration

req.flood := true

vlan_ignore :=

ANA_L2::FWD_CFG.FLOOD_IGNORE_VLAN_ENA

req.dmac_mirror :=

ANA_L2::FWD_CFG.FLOOD_MIRROR_ENA

# CPU copy?

ANA_L2::FWD_CFG.FLOOD_CPU_COPY_ENA?

req.cpu_dest_set( ANA_L2::FWD_CFG.CPU_DMAC_QU) :=

true

false

# VLAN ignore filter mode

ANA_L2:COMMON:FWD_CFG.FILTER_MODE_SEL?

true

req.ignore_src_mask := true

true

req.vlan_mask := ”ALL_ONES”

false

DMAC MAC lookup

performed

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