What is class-based shaping?

Using the Class-Based Shaping feature, you can configure GTS on a class, rather than only on an access control list (ACL). In order to do so, you must first define traffic classes based on match criteria including protocols, ACLs, and input interfaces. You can then apply traffic shaping to each defined class.

What is class-based QoS?

It is used to simply identify the traffic that has the specific priority or class of service (CoS) for mapping between external and internal priorities.

What is policing shaping?

Traffic Shaping. While traffic policing is about dropping or reclassifying packets, traffic shaping tries to make traffic conform to a certain rate by delaying the packets in a buffer and sending them out as “space” becomes available.

What is the main advantage of using Multiaction policing?

Multiaction policing allows more than one action to be applied; for example, marking the Frame Relay DE bit and also the DSCP value before sending the exceeding traffic.

How does a class-based queue work?

Class-based queuing (CBQ) describes a system where network administrators assign a specific priority to each transmission or set of data packets, depending on what type of transmission it is. Network schedulers and other tools allow different types of data through traffic to share system bandwidth.

Is a class-based QoS model designed for IP?

Differentiated Services is a class-based QoS model designed for IP.

What is the difference between policing and shaping?

As mentioned in a previous tip, policing and shaping are QoS components used to limit traffic flow. Policing drops or remarks traffic that exceeds limits, but shaping regulates the traffic back to a defined rate by delaying or queuing the traffic.

What is CIR and BC in QoS?

Bc is an amount of traffic that would be “confirmed” per time interval, called Tc. Tc = Bc / CIR. Be is an amount of traffic that would be “exceeded” per time interval (applicable for 3-colors policers).

When should QoS Policing be implemented?

QoS policing should be implemented to adhere network traffic to a contracted CIR. As an example, if your enterprise contracted a Metro Ethernet connection with an access link of 1 Gb/s and a CIR of 400 Mb/s, you would need to make sure that traffic does not exceed the CIR except for occasional bursts.

What is class map and policy map?

Class Map: A Class map is used to identify the traffic based on some criteria, like ACLs or Protocol. Policy Map: Policy Maps are used to apply a firewall policy to the Class map that is created previously. Policy maps can define what we want to do with the traffic identified by the class map.

Which technique is also known as class-based queuing?

Class-based queuing (CBQ) is a mechanism that defines various levels of service for access to the Internet and can be used with or without Resource Reservation Protocol (RSVP). CBQ divides traffic into queues and assigns each a specific amount of network bandwidth.

What is class-based weighted fair queuing?

CBWFQ is a scheduling mechanism used to provide a minimum bandwidth guarantee to traffic classes during times of network congestion at an interface. Each of the CBWFQ queues is assigned a weight, and the packets are served from the queues based upon the weight of the queue.