[JUNOS] Class of Service – Classification

 

CoS process

 

What is Classification?

Classifier assigns inbound traffic to forwarding classes

# can identify and separate traffic based on incoming packet’s header fields

     <> CoS bits

     <> Protocol, port, addresses, etc.

# Forwarding classes are linked to physical queues in the devices.

# Classifiers also specify loss priority (drop precedence)

     <> Used by policer and scheduler to help determine which traffic to drop under congestion

 

2 types of classification

  # Multifield (MF) classification

     <> Can separate incoming traffic based on packet header field. (ex: IP, ports number, etc)

     <> Configured using a firewall filter; apply to an interface/VLAN.

  # Behavior Aggregation (BA) classification

     <> Can separate incoming traffic based on CoS marking

     <> Configured using a “classifiers”; apply to an interface/VLAN.