D-Link DWS-3227P - xStack Switch - Stackable Manual de usuario descargar pdf (Pagina 15)

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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 packets by the 6 bits in IP DSCP

(differentiated services Code Point). These 6 bits were used in the "old days" for

Type of Service (ToS).

The following 4 mappings are normally available in an MLS:

• From OSI layer 2, 3 or 4 to IP DSCP (if IP packet) and/or VLAN IEEE 802.1p.

• From VLAN IEEE 802.1p to IP DSCP.

• From IP DSCP to VLAN IEEE 802.1p.

• From VLAN IEEE 802.1p to port queue.

Many MLSs implement QoS differentiated services and/or integrated services in

hardware.

Some MLS's are also able to route between VLAN and ports like a common router.

The routing is normally as quick as switching (at wire speed). According to Cisco,

Level 3 switches are basically routers 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 ASICs/hardware instead of the CPU/software that a router would.

Pre-owned CISCO 6509 Multilayer Switch

Layer 4-7 switch, web-switch, content-switch

Some switches can use up to OSI layer 7 packet information; they are called layer 4-

7 switches, content-switches, content services switches, web-switches or application-

switches.

Content switches are typically used for load balancing among groups of servers. Load

balancing can be for HTTP, HTTPS and/or VPN, or for any application TCP/IP traffic

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D-Link DWS-3227P - xStack Switch - Stackable Manual de usuario Pagina 15