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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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VSC7440 датащи(PDF) 157 Page - Microsemi Corporation |
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VSC7440 датащи(HTML) 157 Page - Microsemi Corporation |
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157 / 444 page  Functional Descriptions VMDS-10492 VSC7440 Datasheet Revision 4.2 140 The packet is a candidate for unicast routing if a frame’s DMAC matches one of the router leg MAC addresses. Packets sent to the router itself will also match the router leg MAC address, but these will be caught through entries in the ARP table. Despite matching a router leg MAC address, routing is not performed for any of the following reasons. If any of following criteria are met, the frame may be redirected to the CPU, depending on configuration parameters. • It is not an IP packet (for example, an ARP reply). • There are IP header errors. • DIP or SIP address is illegal (optional). • Packet contains IPv4 options/IPv6 hop-by-hop options. • IPv4 TTL or IPv6 HL is less than two. 3.19.2.3.2 Multicast Router Leg Detection For each router leg, IP multicast routing can be enabled using VMID:RLEG_CTRL.RLEG_IP4_MC_ENA and VMID:RLEG_CTRL.RLEG_IP6_MC_ENA. In addition to having multicast routing enabled for the router leg configured for the VLAN, the frame’s DMAC must be within a specific range in order for the packet to be candidate for IPv4/6 routing. • IPv4 DMAC range: 01-00-5E-00-00-00 to 01-00-5E-7F-FF-FF • IPv6 DMAC range: 33-33-00-00-00-00 to 33-33-FF-7F-FF-FF Despite having a DMAC address within the required range, routing is not performed for any of the following reasons: • There are IP header errors. • DIP or SIP address is illegal (optional). • Packet contains IPv4 options/IPv6 hop-by-hop options • IPv4 TTL or IPv6 HL is less than two. If any of above criteria are met, then the frame may be redirected to CPU, depending on configuration parameters. The frame is still L2 forwarded if no router leg match is found. 3.19.2.3.3 Illegal IPv4 Addresses Use the ROUTING_CFG.IP4_SIP_ADDR_VIOLATION_REDIR_ENA parameters to configure each of the following SIP address ranges to be considered illegal. • 0.0.0.0 to 0.255.255.255 (IP network zero) • 127.0.0.0 to 127.255.255.255 (IP loopback network) • 224.0.0.0 to 255.255.255.255 (IP multicast/experimental/broadcast) Frames with an illegal SIP can be redirected to the CPU using CPU_RLEG_IP_HDR_FAIL_REDIR_ENA. Use the ROUTING_CFG.IP4_DIP_ADDR_VIOLATION_REDIR_ENA parameters to configure each of the following DIP address ranges to be considered illegal. • 0.0.0.0 to 0.255.255.255 (IP network zero) • 127.0.0.0 to 127.255.255.255 (IP loopback network) • 240.0.0.0 to 255.255.255.254 (IP experimental) Frames with an illegal DIP can be redirected to the CPU using CPU_RLEG_IP_HDR_FAIL_REDIR_ENA. 3.19.2.3.4 Illegal IPv6 Addresses Use the ROUTING_CFG.IP6_SIP_ADDR_VIOLATION_REDIR_ENA parameters to configure each of the following SIP address ranges to be considered illegal. • ::/128 (unspecified address) • ::1/128 (loopback address) • ff00::/8 (IPv6 multicast addresses) |
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