Cisco Systems WSC4500X16SFP Manual De Usuario

The logical Layer 3 VLAN interfaces provide logical routing interfaces to VLANs on Layer 2 switches. 
A traditional network requires a physical interface from a router to a switch to perform inter-VLAN 
routing. The Catalyst 4500 series switch supports inter-VLAN routing by integrating the routing and 
bridging functions on a single Catalyst 4500 series switch.

 shows how the routing and bridging functions in the three physical devices of the traditional 

network are performed logically on one Catalyst 4500 series switch.

The physical Layer 3 interfaces support capabilities equivalent to a traditional router. These Layer 3 
interfaces provide hosts with physical routing interfaces to a Catalyst 4500 series switch.

 shows how the Catalyst 4500 series switch functions as a traditional router. 

L2 Switch

L2 Switch

Router

Host 1

Host 2

Traditional network topology for routing
between VLANS 

Host 1

Host 2

Logical Inter-VLAN routing on a single
Catalyst 4500 series switch

Routing

VLAN1

VLAN2

VLAN1

VLAN2

94169

Interface Ethernet

1.1.1.1

Interface VLAN1

1.1.1.1

Interface VLAN2
2.1.1.1

Interface Ethernet
2.1.1.1

Router

Host 1

Host 2

Physical Inter-VLAN Routing on a Catalyst 4500 series switch

Interface Ethernet

1.1.1.1

Interface Ethernet
2.1.1.1

94168

2/1

2/2