TNETX4090
ThunderSWITCH II 9-PORT 100-/1000-MBIT/S ETHERNET SWITCH
SPWS044E ± DECEMBER 1997 ± REVISED AUGUST 1999
frame routing
VLAN support
The internal routing engine supports the IEEE Std 802.1Q VLANs as shown in Figure 11 and described in the following paragraphs.
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| IEEE Std |
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| Non- |
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| Number |
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| 802.1Q |
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| Reset to |
| VLAN | ADDR | Port Information |
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| IEEE Std |
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| Format |
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| VLAN and |
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| Port Numbers, |
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| 802.1Q |
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| Ethernet |
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| Time Stamps |
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| Header |
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| Addresses |
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| NBLCK, New |
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If rxacc = 1 | Header |
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Header Inserted | Possibly |
| Source Address (SA) | and |
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If VLAN ID = 0x000 | Inserted | Header | Destination Address (DA) | Destination |
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| Lookups |
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| Inserted |
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VLAN ID Replaced |
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| Match | Information |
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Reset 0x0001 |
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| SA |
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Source Port's | Inserted |
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| VLANnQID | VLAN | DA |
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Header |
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| VLAN |
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PortxQTag | VLAN ID |
| VLAN ID |
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| Index |
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| Nauto |
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| Lookup |
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| Multicast |
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| Algorithm | UnkVLAN |
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| UnkUniPorts |
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| Queue |
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| 1st Location: | No Match |
| UnkMultiPorts | Lshare |
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| Manager |
| 0x001 |
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| UnkSrcPorts | Nage | SysControl | |
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| UnkVLANPort | |||||
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| All Others: |
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| TxBlockPorts |
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| 0x000 |
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| RxUniBlockPorts |
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| Source Port Number |
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| RxMultiBlockPorts |
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| MirrorPort |
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Destination |
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| Port Routing Code |
| UplinkPort |
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| TrunkMapx | Disable | All Ports | |||
Port's |
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| TrunkxPorts | |||
| Queue |
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PortxQTag |
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| Manager |
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| VLAN |
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| Ports |
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| Header |
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| Reset to | VLANnPorts |
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Compare |
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| IALE |
| All 1s |
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VLAN IDs | Header |
| Header |
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| Stripped |
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| Retained |
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If (equal or |
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txacc = 1) | IEEE Std |
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Then Strip Header, |
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802.1Q |
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Otherwise, | IEEE Std |
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Format |
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Keep Header |
| 802.1Q |
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Frame |
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| Header |
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| Frame |
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Transmit
Figure 11. VLAN Overview
48 | POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |
