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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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KSZ9567RTXI-TR 数据表(PDF) 29 Page - Microchip Technology |
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KSZ9567RTXI-TR 数据表(HTML) 29 Page - Microchip Technology |
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29 / 232 page  2017-2019 Microchip Technology Inc. DS00002329D-page 29 KSZ9567R 4.4.2.3 Reserved Multicast Address Table The Reserved Multicast Address Table holds 8 pre-configured address entries, as defined in Table 4-6. This table is an optional feature that is disabled at power-on. If desired, the forwarding ports may be modified. If a match is found in one of the tables, then the destination port is read from that table entry. If a match is found in more than one table, static entries will take priority over dynamic entries. 4.4.2.4 Learning The internal lookup engine updates the ALU table with a new dynamic entry if the following conditions are met: • The received packet's source address (SA) does not exist in the lookup table. • The received packet has no errors, and the packet size is of legal length. • The received packet has a unicast SA. The lookup engine inserts the qualified SA into the table, along with the port number and age count. If all four table entries are valid, the oldest of the (up to four) dynamic entries may be deleted to make room for the new entry. Static entries are never deleted by the learning process. If all four entries are static entries, the address is not learned but an interrupt is generated and the table index number is made available to the interrupt service routine. 4.4.2.5 Migration The internal lookup engine also monitors whether a station has moved. If a station has moved, it updates the ALU table accordingly. Migration happens when the following conditions are met: • The received packet's SA is in the table but the associated source port information is different. • The received packet has no receiving errors, and the packet size is of legal length. The lookup engine updates the existing record in the table with the new source port information. TABLE 4-6: RESERVED MULTICAST ADDRESS TABLE Group Address MAC Group Address Function Default PORT FORWARD Value (defines forwarding port: P7...P1) Default Forwarding Action 0 (01-80-C2-00)-00-00 Bridge Group Data 100_0000 Forward only to the highest numbered port (default host port) 1 (01-80-C2-00)-00-01 MAC Control Frame (typically flow control) 000_0000 Drop MAC flow control 2 (01-80-C2-00)-00-03 802.1X Access Control 100_0000 Forward to highest num- bered port 3 (01-80-C2-00)-00-10 Bridge Management 111_1111 Flood to all ports 4 (01-80-C2-00)-00-20 GMRP 011_1111 Flood to all ports except high- est numbered port 5 (01-80-C2-00)-00-21 GVRP 011_1111 Flood to all ports except high- est numbered port 6 (01-80-C2-00)-00-02, (01-80-C2-00)-00-04 – (01-80-C2-00)-00-0F 100_0000 Forward to highest num- bered port 7 (01-80-C2-00)-00-11 - (01-80-C2-00)-00-1F, (01-80-C2-00)-00-22 - (01-80-C2-00)-00-2F 011_1111 Flood to all ports except high- est numbered port |
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