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VSC7440 датащи(PDF) 155 Page - Microsemi Corporation

номер детали VSC7440
подробное описание детали  L2/L3 Enterprise Gigabit Ethernet Switch with 10 Gbps Links
PDF  444 Pages
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производитель  MICROSEMI [Microsemi Corporation]
домашняя страница  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

VSC7440 датащи(HTML) 155 Page - Microsemi Corporation

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Functional Descriptions
VMDS-10492 VSC7440 Datasheet Revision 4.2
138
Figure 31 •
Multicast Routing Table Overview
3.19.2.3 Ingress Router Leg Lookup
The VID used to determine the ingress router leg is the classified VID. The classified VID can be
deducted based on a variety of parameters, such as VLAN tag or ingress port. For more information, see
VLAN Classification, page 110.
A total of 32 router legs are supported. Each router leg can be used for both IPv4 and IPv6 unicast and
multicast routing. A maximum of one router leg per VLAN is supported.
When processing incoming frames, the classified VID is used to index the VLAN table. The RLEG_ENA
parameter determines if the VLAN is enabled for routing of packets, and if so, the VMID is used to index
the VMID table. The flow is depicted in the following illustration.
VCAP
L3MC
Table
VLAN
Table
MSTP
Table
VMID
Table
IP Multicast Routing Decision
VMID
Table
VLAN
Table
MSTP
Table
VMID
Egress VMID
RLEG_EVID
MSTP_PTR
Classified VID
Second pass:
L3MC_PTR
from first pass
L2 Forwarding Decision
for Egress VLAN
L2 Forwarding Decision
for Ingress VLAN
First pass: (DIP,SIP)
VLAN_MSTP_PTR
First pass:
L3MC-PTR
Egress router leg/
egress VLAN
Ingress VLAN/
Ingress router leg



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