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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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KSZ9567R 数据表(PDF) 31 Page - Microchip Technology |
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KSZ9567R 数据表(HTML) 31 Page - Microchip Technology |
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31 / 233 page  2022 Microchip Technology Inc. and its subsidiaries DS00002329E-page 31 KSZ9567R 4.4.2.6 Aging The lookup engine updates the age count information of a dynamic record in the ALU table whenever the corresponding SA appears. The age count is used in the aging process. If a record is not updated for a period of time, the lookup engine removes the record from the table. The lookup engine constantly performs the aging process and continuously removes aging records. The aging period is about 300 seconds (±75 seconds) and can be configured longer or shorter (1 second to 30 minutes). This feature can be enabled or disabled. Static entries are exempt from the aging process. 4.4.2.7 Forwarding The device forwards packets using the algorithm that is depicted in Figure 4-3. Figure 4-3 shows stage one of the for- warding algorithm where the search engine looks up the VLAN ID, static table, and dynamic table for the destination address, and comes up with “port to forward 1" (PTF1). PTF1 is then further modified by spanning tree, IGMP snooping, port mirroring, and port VLAN processes. The ACL process works in parallel with the flow outlined above. The authentication and ACL processes have the highest priority in the forwarding process, and the ACL result may override the result of the above flow. The output of the ACL process is the final “port-to-forward 2" (PTF2) destination port(s). The device will not forward the following packets: • Error packets: These include framing errors, frame check sequence (FCS) errors, alignment errors, and illegal size packet errors. • MAC Control PAUSE frames: The device intercepts these packets and performs full duplex flow control accord- ingly. • “Local” packets: Based on destination address (DA) lookup. If the destination port from the lookup table matches the port from which the packet originated, the packet is defined as “local”. • In-Band Management packets. FIGURE 4-3: PACKET FORWARDING PROCESS FLOWCHART Start PTF1=NULL VLAN ID Valid? no Get PTF1 from Static Array Search Static Array found Get PTF1 from Address Table Search Address Look-up Table found Get PTF1 from VLAN Table PTF1 yes not found not found - Search VLAN table - Ingress VLAN filtering -Discard NPVID check Search based on DA or DA+FID Search based on DA+FID PTF1 Spanning Tree Process Port Mirror Process IGMP / MLD Process PTF2 - Check receiving port s receive enable bit - Check destination port s transmit enable bit - Check whether packets are special (BPDU) - IGMP / MLD packets are forwarded to Host port - Process does not apply to packets received at Host port -RX Mirror -TX Mirror - RX or TX Mirror - RX and TX Mirror Port Authentication & ACL |
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