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KSZ9567R 数据表(PDF) 33 Page - Microchip Technology

部件名 KSZ9567R
功能描述  7-Port Gigabit Ethernet Switch with Audio Video Bridging and Two RGMII/MII/RMII Interfaces
PDF  233 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

KSZ9567R 数据表(HTML) 33 Page - Microchip Technology

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DS00002329E-page 33
KSZ9567R
The hashed(DA) + FID are hashed and used for forwarding lookup in the Address Lookup and Static Address Tables.
For a successful address table lookup, the FID fields must also match. If the match fails, the packet is broadcast to all
the VLAN port members defined in the VLAN Table entry. If there is a match and egress VLAN filtering is enabled, the
packet is forwarded to those ports that are in both the address table port forwarding list and the VLAN table port mem-
bership list.
A similar address table lookup is performed using the hashed(SA) + FID. If the lookup fails, the FID and SA are learned.
If a non-tagged or null-VID-tagged packet is received, the ingress port default VID (Port Default Tag 0 Register and Port
Default Tag 1 Register) is used for lookup.
Table 4-8 details the forwarding and discarding actions that are taken for the various VLAN scenarios. The first entry in
the table is explained by the fact that VLAN Table lookup is enabled even when 802.1Q VLAN is not enabled. Notice
that in the Port Default Tag 0 Register and Port Default Tag 1 Register, the port default VID is 1 for each port. Corre-
spondingly, the VLAN port membership list in the VLAN Table entry for VID=1 is pre-configured at power-on to all ones.
This provides the standard Ethernet switch behavior of broadcasting all packets with unknown destination address. If
the VLAN table entry # 1 is changed, or if the port default VID is changed, this may affect the forwarding action for
“unknown packets” even when VLAN is not enabled.
It should also be noted that the default values of the Egress VLAN Filtering bits are zero. These bits are zero only for
backwards compatibility with previous “KSZ” switches. The resulting switch behavior, in the event of a successful VLAN
and ALU lookups, is to forward the packet to the ports in the address table port forwarding list, without regard to the
VLAN port membership list. It is suggested that the Egress VLAN Filtering bits be set to one so that the VLAN port mem-
bership list from the VLAN Table will be used to qualify the forwarding determined from the address lookup.
TABLE 4-8:
VLAN FORWARDING
VLAN
Enable
(Note 4-1)
VLAN
Match/
Valid
(Note 4-2)
Forward
Option
(Note 4-3)
Egress
VLAN
Filtering
(Note 4-4)
Unknown
VID
Forward
(Note 4-5)
Drop
Invalid
VID
(Note 4-6)
ALU
Match/
Valid
(Note 4-7)
Action
0
X
X
X
X
X
No
Forward to port membership list
of default VID in LAN table
0
X
X
X
X
X
Yes
Forward to Address Lookup
port forwarding list
1
No
X
X
0
0
X
Forward to host port
1
No
X
X
0 (def)
1 (def)
X
Discard
1
No
X
X
1
X
X
Forward to Unknown VID
packet forward port list
1Yes
0
X
X
X
No
Broadcast: Forward to VLAN
table port membership list
(PORT FORWARD)
Multicast: Forward to
Unknown Multicast ports if UM
is enabled. Else, forward to
VLAN table port membership
list.
Unicast: Forward to Unknown
Unicast ports if UU is enabled.
Else forward to VLAN table port
membership list.
1
Yes
0
0 (def)
X
X
Yes
Forward to address table
lookup port forwarding list
1
Yes
0
1
X
X
Yes
Forward to address table
lookup port forwarding list &
VLAN table port membership
list (bitwise AND)
1
Yes
1
X
X
X
Yes
Forward to VLAN table port
membership list



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