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LAYER 3 SWITCHING The major difference between the packet switching operation of a Router and that of a Layer 3 switch is the physical implementation. In general-purpose routers, packet switching takes place using a microprocessor, whereas a Layer 3 switch performs this using application specific integrated circuit ( ASIC ) hardware. MULTILAYER SWITCH (MLS) - OSI LAYER 3 AND/OR 4 A Multilayer Switch (MLS) can prioritize Packet s by the 6 bits in IP DSCP ( Differentiated Services CodePoint). These 6 bits were used in the "old days" for Type Of Service ( ToS ). The following 4 mappings are normally available in a MLS:
Many MLSs implement QoS Differentiated Services and/or Integrated Services in hardware. Some MLSs are also able to route between VLAN and/or Port s like a common Router . The routing is normally as quick as switching (at wirespeed). According to Cisco , Level 3 switches are basically Router s that switch based on Layer 3 information, the basic difference being processing speed and/or the way they do the switching; Level 3 switches use ASIC s/ Hardware instead of the CPU / Software that a router would. LAYER 7 SWITCH, WEB-SWITCH, CONTENT-SWITCH Some switches can use up to OSI layer 7 packet information; they are called layer 7 switches, content-switches, or web-switches. Some of the applications areas are load-balancing among HTTP , HTTPS and/or VPN Server s. Load-balancing can be made by using NAT . Some of the layer 7 switches can NAT at wirespeed. EXTERNAL LINKS
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