Layer2 switched data was the fastest way to send data in early networks. The router took a long time.
Network engineers aim to extend the switch sections to include access, distribution and core layers. Loop issues were created by connecting layer 2 switches to those layers.
Engineers developed the span-tree protocols to solve the problem.
The router was then moved to core or distribution levels, without any impact on network performance. Next, users were divided into subnets or VLANs. Next network engineers created the distribution swathes out of the VLANs, which act as layer 3 gateways to access the switch VLANs user.
This means that each distribution switch needs to be assigned an IP address. Because there are no physical loops below level 2,
We are able to configure multilayer switch VLANs for Layer 2 (layer3) support, and inter-VLAN routing.
A Switch Virtual Interface does not provide a physical connection.
Layer Three packet processing by the VLAN-associated host It’s important that your switch is connected to the VLAN where you intend to configure
You can see that it must be running VLAN 100 within the VLAN Database. The SVI interface will not work if it isn’t.
- To create a VLAN gateway.
- Layer 3. IP connectivity is possible for the switch
- To enable routing protocol and bridging arrangements
Two virtual infrastructures (SVIs)were required to route inter-VLAN data.
You can enable routing by using the IP routing command. This command uses the IP address information to create the routing tables for your switch.
You can verify the IP routing configuration by using the Show IP route, Show Startup-config command.
As I stated, the switch interface(SVII), is available for Layer 3 as well as Layer 2 switches. Layer 2 switches can only be used with the switch inter (SVII).
Confirm the configuration of the interface by using the Show Ip Interface brief command. Similar commands can be used for verifying router interfaces.
This will show all ports and the virtual interface of your switch.
- Switch virtual Interface is faster than routers with sticks, since everything is hardware switched.
- Routing doesn’t depend on links between the router/switch.
- Layer 2 Ethernet channel can be used to increase bandwidth.
Their high price is the downside to layer 3 switches.