VSC7440 datasheet(156/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

139

Figure 32 •

Ingress Router Leg Lookup Flow

3.19.2.3.1 Unicast Router Leg Detection

On L2, up to three different MAC addresses are used to identify the router leg:

•

The normal router leg MAC address. This MAC address consists of a base address that is

configured using COMMON:RLEG_CFG_0.RLEG_MAC_LSB and

COMMON:RLEG_CFG_0.RLEG_MAC_MSB.

To have different MAC addresses for each router leg, the three least significant bytes of the base

MAC address can optionally be incremented by the Classified VID or the VMID. This is configured

using COMMON:RLEG_CFG_1.RLEG_MAC_TYPE_SEL.

•

VRRP MAC address for IPv4. This MAC address consists of a base address that is configured using

COMMON:VRRP_IP4_CFG_0.VRRP_IP4_BASE_MAC_MID and

COMMON:VRRP_IP4_CFG_0.VRRP_IP4_BASE_MAC_HIGH.

For each router leg, the least signficant byte is configured per router leg using

VMID:VRRP_CFG.RLEG_IP4_VRID. Up to two VRID values are supported per router leg.

Use of VRRP for IPv4 is enabled using VMID:RLEG_CTRL.RLEG_IP4_VRID_ENA.

•

VRRP MAC address for IPv6. This is configured in the same manner as VRRP MAC address for

IPv4.

The matching of router leg MAC address for unicast packets is shown in the following illustration.

Figure 33 •

Ingress Router Leg MAC Address Matching for Unicast Packets

VMID Table

RLEG_IP4_UC_ENA

RLEG_IP4_MC_ENA

RLEG_IP4_ICMP_REDIR_ENA

RLEG_IP4_VRID_ENA

RLEG_IP6_UC_ENA

RLEG_IP6_MC_ENA

RLEG_IP6_ICMP_REDIR_ENA

RLEG_IP6_VRID_ENA

RLEG_EVID(11:0)

RLEG_IP4_VRID0(7:0)

RLEG_IP6_VRID1(7:0)

RLEG_IP4_MC_TTL(7:0)

RLEG_IP6_MC_TTL(7:0)

VMID

VLAN_RLEG_ENA

Classified

VID

VLAN Table

(Router leg

configuration)

RLEG_IP4/6_UC_ENA

RLEG_IP4/6_VRID_ENA

RLEG_IP4/6_VRID

Frame.DMAC

From VMID Table:

(47:0)

(7:0)

VRRP Base MAC address

(47:8)

Router leg MAC

address match

COMMON:VRRP_IP4/6_CFG_0.VRRP_IP4/6_BASE_MAC_HIGH

COMMON:VRRP_IP4/6_CFG_1.VRRP_IP4/6_BASE_MAC_MID

Normal base MAC address

COMMON:RLEG_CFG_1.RLEG_MAC_MSB

COMMON:RLEG_CFG_0.RLEG_MAC_LSB

AND

Frame is IPv4/6

RLEG selector

COMMON:RLEG_CFG_1.RLEG_MAC_TYPE_SEL

IVMID

Classified VID

Frame’s DMAC matches

Router’s MAC address

Frame’s DMAC

matches VRRP MAC

address

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