High Performance Two Port 10/100 Managed Ethernet Switch with
Datasheet
Packet is from Host
Packet is Tagged
Packet is IPv 4
Packet is IP
VL Higher Priority
Use Precedence
Use IP
VLAN Enable
IPv4(TOS) 6b Programmable 3b
IPv6(TC)DIFFSERV Table
IPv4 Precedence | 3b |
| Priority | 3b |
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| 3b | flow priority | |
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| Calculation | ||
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2b Programmable
Source Port 
Port Default
Table
3b
VLAN Priority
Figure 6.7 Switch Engine Ingress Flow Priority Selection
The ingress flow calculation is based on the packet type and the device configuration as shown in Figure 6.8.
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| Get Flow Priority |
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| Y |
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| Packet from Host |
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| N |
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| VL Higher |
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| Priority |
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| Y |
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| Vlan Enable & | Y |
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| Packet is |
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| Tagged |
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| N |
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| Y | Packet is IPv 4/v6 |
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| & Use IP |
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| N |
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| Y | Packet is IPv4 | Vlan Enable & | Y |
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| Packet is |
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| Tagged |
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| Y | Use Precedence | N |
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Flow Priority = |
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| Flow Priority = |
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| Flow Priority = |
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| Flow Priority = |
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| Flow Priority = | |||||||
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| Default Priority[Source |
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IP Precedence |
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| DIFFSERV[TOS] |
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| DIFFSERV[TC] |
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| VLAN Priority | |||||||||
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| Port] |
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Get Flow Priority Done
Figure 6.8 Switch Engine Ingress Flow Priority Calculation
SMSC LAN9312 | 73 | Revision 1.4 |
| DATASHEET |
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