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KSZ9567R 数据表(PDF) 33 Page - Microchip Technology |
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KSZ9567R 数据表(HTML) 33 Page - Microchip Technology |
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33 / 233 page  2022 Microchip Technology Inc. and its subsidiaries 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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