To Next Page

To Previous Page

Chapter 17

| General IP Routing

IP Routing and Switching

– 670 –

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.

Figure 440: Virtual Interfaces and Layer 3 Routing

IP Routing and 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

If the destination node is on the same subnetwork as the source network, then the

packet can be transmitted directly without the help of a router. However, if the MAC

VLAN 1

VLAN 2

Inter-subnet traffic (Layer 3 switching)

Routing

Unt

Untagged

Unt

Untagged

Tagged or Untagged

Intra-subnet traffic (Layer 2 switching)

Edge-Core ECS4620-28T User Manual

Other manuals for Edge-Core ECS4620-28T