TNETX3270
ThunderSWITCH 24/3 ETHERNET SWITCH
WITH 24 10-MBIT/S PORTS AND 3 10-/100-MBIT/S PORTS
SPWS043B ± NOVEMBER 1997 ± REVISED APRIL 1999
frame routing
VLAN support
The internal routing engine supports the IEEE Std 802.1Q VLANs as shown in Figure 8 and described in the following paragraphs.
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| IEEE Std |
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| 802.1Q |
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| VLAN | ADDR |
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| IEEE Std | Reset to | Port Information |
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| Format | VLAN and | Port Numbers, |
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| 802.1Q | All 0s |
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| Ethernet | Time Stamps |
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| Header |
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| Frame |
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| Addresses | Locked, Secure, |
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| NBLCK, New |
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If rxacc = 1 | Header |
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| Source |
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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 | No | Port |
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| Lookups |
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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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| Reset |
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| UnkUniPorts |
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| UnkMultiPorts |
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| Queue |
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| 1st Location: | No Match |
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| Lshare |
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| UnkSrcPorts |
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| Manager |
| 0x001 |
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| 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 | Mirror |
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| RAM |
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| Source Port Number |
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| RxMultiBlockPorts |
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| MirrorPort |
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| Port Routing Code |
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| TrunkMapx |
| Disable | All Ports | ||
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| TrunkxPorts |
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| Portxcontrol | |
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| NLearnPorts |
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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 |
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| 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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| Format |
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| Header |
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| Frame |
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Transmit
Figure 8. VLAN Overview
POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 | 39 |