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What Is Sub Interface in Router?

Robert Thorne • • 6 min read
What Is Sub Interface in Router?
A subinterface is a virtual interfacecreated by dividing one physical interface into multiplelogical interfaces. A sub-interface in a CiscoRouter uses the parent physical interface for sendingand receiving data. Subinterfaces are used for a variety ofpurposes.

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Similarly, you may ask, what does router on a stick mean?

Router-on-a-stick is a term frequently used todescribe a setup up that consists of a router and switchconnected using one Ethernet link configured as an 802.1q trunklink. In this setup, the switch is configured with multiple VLANsand the router performs all routing between the differentnetworks/VLANs.

Beside above, what is the function of command encapsulation dot1q? IEEE 802.1Q encapsulation is configurable onEthernet and EtherChannel interfaces. IEEE 802.1Q is astandard protocol for interconnecting multiple switches and routersand for defining VLAN topologies. Use the encapsulation dot1qcommand in subinterface range configuration mode to apply aVLAN ID to the subinterface.

Moreover, how many subinterfaces can be configured on an interface?

You can partition one physical interfaceinto up to 4094 different subinterfaces, one for eachVLAN.

What is inter VLAN routing?

VLANs divide broadcast domains in a LANenvironment. Whenever hosts in one VLAN need to communicatewith hosts in another VLAN, the traffic must berouted between them. This is known as inter-VLANrouting.

Related Question Answers

What is a disadvantage of router on a stick?

Disadvantages. The disadvantages to aRouter on a Stick Network are: It is more complex toset up compared to other networks. Traffic between VLANs goes intothe router and out of the router through the sameport. The trunk is a major source of congestion.

What are SVI settings?

From Wikipedia, the free encyclopedia. A SwitchedVirtual Interface (SVI) is a virtual interface (and port)that transmits only untagged-vlan packets for a managed switch.There is one-to-one mapping between a VLAN and SVI, thusonly a single SVI can be mapped to a VLAN.
Robert Thorne
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Robert Thorne

Robert Thorne covers electric vehicle innovations, autonomous driving systems, global mobility trends, and automotive engineering developments.