Configuring the ECN330-switch
398 1553-KDU 137 365 Uen D 2006-06-16
Each VLAN represents a virtual interface to Layer 3. When a network address
for each virtual interface is provided, the traffic between different subnetworks is
routed by Layer 3 switching.
Figure 172 Virtual Interfaces and Layer 3 Routing
6.20.2 IP Switching
IP Switching (or packet forwarding) encompasses tasks required to forward
packets for both Layer 2 and Layer 3, as well as traditional routing. These
functions include:
• Layer 2 forwarding (switching) based on the Layer 2 destination MAC
address
• Layer 3 forwarding (routing):
• Based on the Layer 3 destination address
• Replacing destination/source MAC addresses for each hop
• Incrementing the hop count
VLAN 1
VLAN 2
Inter-subnet traffic (Layer 3 switching)
Routing
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Intra-subnet traffic (Layer 2 switching)
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