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VSC7440 Datasheet(PDF) 131 Page - Microsemi Corporation |
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VSC7440 Datasheet(HTML) 131 Page - Microsemi Corporation |
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131 / 444 page  Functional Descriptions VMDS-10492 VSC7440 Datasheet Revision 4.2 114 The basic classifier has support for determining whether certain frames must be forwarded to the CPU extraction queues. Other parts of the device can also determine CPU forwarding, for example, the VCAPs or the VOEs. All events leading to CPU forwarding are OR’ed together, and the final CPU extraction queue mask, which is available to the user, contains the sum of all events leading to CPU extraction. Upon CPU forwarding by the basic classifier, the frame type and configuration determine whether the frame is redirected or copied to the CPU. Any frame type or event causing a redirection to the CPU causes all front ports to be removed from the forwarding decision—only the CPU receives the frame. When copying a frame to the CPU, the normal forwarding of the frame to front ports is unaffected. The following table lists the standard frame types recognized by the basic classifier, with respect to CPU forwarding. Each frame type has a corresponding CPU extraction queue. Note that hop-by-hop and ICMPv6 frames share the same CPU extraction queue. Prior to deciding whether to CPU forward a frame, the frame’s VLAN tagging must comply with a configurable filter (ANA_CL::CAPTURE_CFG.CAPTURE_TPID_AWARE_DIS). For all frame types listed ANA_CL::VRAP_HDR_DATA Data match against VRAP header None ANA_CL::VRAP_HDR_MASK Mask used to don’t care bits in the VRAP header None Table 73 • Frame Type Definitions for CPU Forwarding Frame Condition Copy/Redirect BPDU Reserved Addresses (IEEE 802.1D 7.12.6) DMAC = 0x0180C2000000 to 0x0180C20000F Redirect/Copy/Discard GARP Application Addresses (IEEE 802.1D 12.5) DMAC = 0x0180C2000020 to 0x0180C200002F Redirect/Copy/Discard Y.1731/IEEE802.1ag Addresses DMAC = 0x0180C2000030 to 0x0180C200003F Redirect/Copy/Discard IGMP DMAC = 0x01005E000000 to 0x01005E7FFFFF EtherType = IPv4 IP Protocol = IGMP Redirect MLD DMAC = 0x333300000000 to 0x3333FFFFFFFFF EtherType = IPv6 IPv6 Next Header = 0 (Hop-by-hop options header) Hop-by-hop options header with the first option being a Router Alert option with the MLD message (Option Type = 5, Opt Data Len = 2, Option Data = 0). Redirect Hop-by-hop EtherType = IPv6 IPv6 Next Header = 0 (Hop-by-hop options header) Redirect ICMPv6 EtherType = IPv6 IPv6 Next Header = 58 (ICMPv6) Redirect IPv4 Multicast Ctrl DMAC = 0x01005E000000 to 0x01005E7FFFFF EtherType = IPv4 IP protocol is not IGMP IPv4 DIP inside 224.0.0.x Copy IPv6 Multicast Ctrl DMAC = 0x333300000000 to 0x3333FFFFFFFF EtherType = IPv6 IPv6 header is not hop-by-hop or ICMPv6 IPv6 DIP inside FF02::/16 Copy Table 72 • CPU Forwarding Registers (continued) Register Description Replication |
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