Layer 3 Routing Diagram. The diagram above shows one layer 3 switch used for aggregation three layer 2 switches used for access purposes and one router for internet connectivity. In a university the pcs of faculties staff and students are connected via l 2 and l 3 switches on a different set of vlans.
That is the physical interfaces receive ethernet frames. Creating the primary layer. Layer 3 provides the networks routing and switching technologies that create logical paths known as virtual circuits vc which are used for the transmission of data between network nodes.
Lets go through it with the help of an example.
Layer 2 is the logical layer of the osi model. In this simple inter vlan routing scenario we will be using a cisco catalyst 3550 as our layer 3 switch. Routing is a function of computer networking where ip datagrams from a computer residing on one network are forwarded to another computer on a remote network. We identified it from well behaved source.