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TNETX4080 数据表(PDF) 37 Page - Texas Instruments |
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TNETX4080 数据表(HTML) 37 Page - Texas Instruments |
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37 / 64 page ![]() TNETX4080 ThunderSWITCH II™ 8-PORT 10-/100-MBIT/S ETHERNET™ SWITCH SPWS050A – AUGUST 1998 – REVISED NOVEMBER 1998 37 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 frame routing VLAN support The internal routing engine supports the IEEE Std 802.1Q VLANs as shown in Figure 6 and described in the following paragraphs. Source and Destination Lookups IEEE Std 802.1Q Format Frame Header Non- IEEE Std 802.1Q Format Frame Receive Header Header Inserted If rxacc = 1 Header Inserted Queue Manager RAM Queue Manager Header IEEE Std 802.1Q Format Frame Header Non- IEEE Std 802.1Q Format Frame Transmit Inserted VLAN ID Reset 0x0001 Header Stripped Header Retained VLANnQID VLAN ID Lookup Source Address (SA) Destination Address (DA) Reset 1st Location: 0x001 All Others: 0x000 No Match VLAN and Ethernet Addresses VLAN ADDR Reset to All 0s SA DA VLAN VLAN Index UnkUniPorts UnkMultiPorts UnkSrcPorts UnkVLANPort TxBlockPorts RxUniBlockPorts RxMultiBlockPorts MirrorPort UplinkPort TrunkMapx TrunkxPorts NLearnPorts Source Port Number Port Routing Code Port Numbers, Time Stamps Locked, Secure, NBLCK, New Port Information Reset is Don’t Care Record Number No Match Port Information All Ports PortxControl VLAN Ports Nauto UnkVLAN Lshare Disable VLANnPorts Reset to All 1s IALE If (equal or txacc = 1) Then Strip Header, Otherwise, Keep Header If VLAN ID = 0x000 VLAN ID Replaced Header Possibly Inserted Nage Mirror SysControl Unicast/ Multicast Compare VLAN IDs Destination Port’s PortxQTag Source Port’s PortxQTag Frame-Routing Algorithm Figure 6. VLAN Overview |
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