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Inter-VLAN Routing - Coggle Diagram
Inter-VLAN Routing
Legacy Inter-VLAN routing
This is a legacy solution. It does not scale well.
Needs one interface per VLAN. This is a great limitation
The router interfaces served as the default gateways to the local hosts on the VLAN subnet.
This method of inter-VLAN routing is no longer implemented in switched networks and is included for explanation purposes only.
Layer 3 switch using switched virtual interfaces (SVIs)
This the modern method of performing inter-VLAN routing
An SVI is a virtual interface that is configured on a Layer 3 switch
Advantages
They are much faster
no need for external links from the switch to the router for routing.
Latency is much lower because data does not need to leave the switch in order to be routed
Disadvantage
Layer 3 switches are more expensive.
Router-on-a-Stick
This is an acceptable solution for a small to medium-sized network
Requires only one Physical inteerface
The interface is configured as trunk port using 802.1Q
The configured subinterfaces are software-based virtual interfaces. Each is associated with a single physical Ethernet interface. Subinterfaces are configured in software on a router
Each subinterface is independently configured with an IP address and VLAN assignment. Subinterfaces are configured for differ
The router-on-a-stick method of inter-VLAN routing does not scale beyond 50 VLANs
is the process of forwarding network traffic from one VLAN to another VLAN.