What is Cisco subinterface?

What is Cisco subinterface?

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.

What is VLAN subinterface?

A dot1q VLAN subinterface is a virtual Cisco IOS interface that is associated with a VLAN ID on a routed physical interface. A parent interface is a physical port. Subinterfaces can be created only on Layer 3 physical interfaces.

How do I use QoS on my Cisco router?

Let’s review the steps to configuring QoS on a Cisco router.

1. Step 1: Define the traffic.
2. Step 2: Create a class-map.
3. Step 3: Create a policy-map.
4. Step 4: Apply the policy-map to the interface.

What is subinterface in Java?

An interface can extend another interface, just as a class can extend another class. Such an interface is called a subinterface.

How do I create a subinterface on my Cisco router?

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.

How do I add a subinterface 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 inherited by subinterface from Superinterface?

All the abstract and default methods of a super interface are inherited by the subinterface. When a subinterface extends more than one interface, then either a default-default conflict or an abstract-default conflict arises. Override the conflicting method with a default method and provide a new implementation.

Are interfaces inherited Java?

But unlike classes, interfaces can actually inherit from multiple interfaces. This is done by listing the names of all interfaces to inherit from, separated by comma. A class implementing an interface which inherits from multiple interfaces must implement all methods from the interface and its parent interfaces.

How does queueing work in Cisco IOS logical interfaces?

The excess packets are then queued. A queueing method can be applied to packets waiting to be transmitted. Cisco IOS logical interfaces do not inherently support a state of congestion and do not support the direct application of a service policy that applies a queueing method.

Can a Cisco IOS logical interface support congestion?

Cisco IOS logical interfaces do not inherently support a state of congestion and do not support the direct application of a service policy that applies a queueing method. Instead, you first need to apply shaping to the subinterface using either generic traffic shaping (GTS) or class-based shaping.

How does class based shaping work in Cisco IOS?

Class-based shaping limits the output rate and (we can assume) leads to a congested state on the logical subinterface. The subinterface than applies “backpressure,” and Cisco IOS begins queueing the excess packets that are held by the shaper.

What is the priority command for CBWFQ in Cisco?

Use the bandwidth command for CBWFQ, or the priority command for Low Latency Queueing (LLQ) at lower levels. Class-based shaping limits the output rate and (we can assume) leads to a congested state on the logical subinterface.