How many per-hop behaviors have been defined for DiffServ?

How many per-hop behaviors have been defined for DiffServ?

The assured forwarding (AF) per-hop behavior provides four different forwarding classes that you can assign to a packet.

What does the term Per-Hop Behavior?

In computer networking, per-hop behaviour (PHB) is a term used in differentiated services (DiffServ) or multiprotocol label switching (MPLS). It defines the policy and priority applied to a packet when traversing a hop (such as a router) in a DiffServ network.

How do you assign DiffServ classes?

Create a DiffServ class of type “all” for each of the departments, and name them. Define the match criteria — Source IP address — for the new classes. Create a DiffServ policy for inbound traffic named ‘internet_access’, adding the previously created department classes as instances within this policy.

What is PHB in QoS?

In Diffserv terminology, the forwarding behavior that is assigned to a DSCP is called the per-hop behavior (PHB). For example, your QoS policy can assign to one class of traffic a DSCP that guarantees a low-drop precedence PHB from any Diffserv-aware router, which guarantees bandwidth to packets of this class.

What is per hop behavior in DiffServ?

Per-Hop Behaviors. In Diffserv terminology, the forwarding behavior that is assigned to a DSCP is called the per-hop behavior (PHB). The PHB defines the forwarding precedence that a marked packet receives in relation to other traffic on the Diffserv-aware system.

What is the per-hop behavior (PHB)?

In Diffserv terminology, the forwarding behavior that is assigned to a DSCP is called the per-hop behavior (PHB). The PHB defines the forwarding precedence that a marked packet receives in relation to other traffic on the Diffserv-aware system.

What are the different types of per-hop forwarding behaviors?

In practice, however, most networks use the following commonly defined per-hop behaviors: Default Forwarding (DF) PHB — which is typically best-effort traffic Expedited Forwarding (EF) PHB — dedicated to low-loss, low-latency traffic Assured Forwarding (AF) PHB — gives assurance of delivery under prescribed conditions

What is the per-hop behavior for EF DSCP?

This per-hop behavior assures that any traffic class with EFs related DSCP is given highest priority. Traffic with an EF DSCP is not queued. EF provides low loss, latency, and jitter.