What are subinterfaces on a router?

What are subinterfaces on a router?

A subinterface is a virtual interface created by dividing one physical interface into multiple logical interfaces. A sub-interface in a Cisco Router uses the parent physical interface for sending and receiving data.

How many subinterfaces does a Cisco router have?

You can partition one physical interface into up to 4094 different subinterfaces, one for each VLAN.

Why do you need subinterfaces?

Subinterfaces divide the parent interface into two or more virtual interfaces on which you can assign unique Layer 3 parameters such as IP addresses and dynamic routing protocols. One of the uses of subinterfaces is to provide unique Layer 3 interfaces to each VLAN that is supported by the parent interface.

How do I add a sub interface to a VLAN?

To configure additional IP interfaces over the VLAN major interface:

1. Create a new VLAN subinterface by adding a unique subinterface number to the interface identification command. host1(config-if)#interface fastEthernet 4/1.2.
2. Assign a VLAN ID for the subinterface.
3. Assign an IP address and mask.

What is a subinterface VLAN?

VLANs enable a device to carry multiple discrete broadcast domains, allowing a single switch to function as if it were multiple switches. This is used to transport multiple VLANs inside another VLAN-tagged outer frame. …

How do I create a subinterface on a Cisco switch?

To create a VLAN subinterface, use the interface command in XR Config mode. To delete a subinterface, use the no form of this command. Physical interface or virtual interface followed by the subinterface path ID.

What is the maximum number of virtual Lans allowed per physical interface?

4,094
Under IEEE 802.1Q, the maximum number of VLANs on a given Ethernet network is 4,094 (4,096 values provided by the 12-bit VID field minus reserved values at each end of the range, 0 and 4,095).

What are the benefits of using VLANs?

The Real Advantages of a Virtual LAN (VLAN)

• help with network efficiency by reducing extraneous traffic;
• enhance security by creating a virtual boundary around that business unit;
• improve bandwidth performance by limiting node-to-node and broadcast traffic;

How do I create a subinterface in Juniper router?

To configure the subinterfaces on the access switch:

1. On the trunk interface of the access switch, enable VLAN tagging:
2. Bind vlan1’s VLAN ID to the logical interface:
3. Set vlan1’s subinterface IP address:
4. Bind vlan2’s VLAN ID to the logical interface:
5. Set vlan2’s subinterface IP address:

Can switches have subinterfaces?

Modern multi-layer switches seem to support both SVIs (switch virtual interfaces) and subinterfaces concepts. Both are virtual layer 3 concepts used to perform routing functions and some equipment supports both.

What is Cisco sub interface?

Subinterface in Cisco routers. A sub interface is the logical division of physical interface. A physical interface can be divided into multiple sub interfaces. Sub interfaces are used when Virtual Local Area Network (VLAN) is created in the network and inter-VLAN routing is enabled using a router on a stick method.

What is sub interface?

Sub-Interface. What: A sub-interface is a logical interface that uses the “parent” physical interface for actually moving the data. Why: If we had a router with only 1 physical interface, but needed to have the router connected to two IP networks, so that it could do routing, we could create 2 logical sub interfaces,…

What is interface configuration?

Interface Configuration. COSMOS implements this method to allow the Protocol system to operate on the data and the packet before it is returned. write – Send a packet to the interface. COSMOS implements this method to allow the Protocol system to operate on the packet and the data before it is sent.