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ONFIGURING
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WITCH
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Each VLAN represents a virtual interface to Layer 3. You just need to
provide the network address for each virtual interface, and the traffic
between different subnetworks will be routed by Layer 3 switching.
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
- Decrementing the time-to-live
- Verifying and recalculating the Layer 3 checksum
VLAN 1
VLAN 2
Inter-subnet traffic (Layer 3 switching)
Routing
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Intra-subnet traffic (Layer 2 switching)