Avaya Configuring Ethernet, FDDI, and Token Ring Services Manual de usuario descargar pdf (Pagina 80)

Configuring Ethernet, FDDI, and Token Ring Services

5-4

308623-14.00 Rev 00

More commonly, however, routing services are provided by an adjacent router, as

shown in Figure 5-2

, where frames originating on the Marketing VLAN and

destined for the Sales VLAN are switched across a dedicated port by the VLAN

device to the attached router. The router, operating at layer 3, redirects the frame

across another dedicated port to the VLAN device, which in turns switches the

frame at layer 2 to the recipient VLAN.

The configuration illustrated in Figure 5-2

is inefficient for both the router and the

VLAN device, because it requires a dedicated port for each VLAN. In network

topologies that support multiple VLANs, the costs for dedicated ports may be

prohibitive.

Figure 5-2. Connecting VLANs Using a Router

VLAN

device

SN0020A

Router

Marketing

IP VLAN

Engineering

IP VLAN

Sales

IP VLAN

Dedicated VLAN-specific

untagged ports

Traffic flow

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Avaya Configuring Ethernet, FDDI, and Token Ring Services Manual de usuario Pagina 80