Classification and Marking

Reviewing Our "if" Condition

("identifying something")

• When classifying interesting traffic, we match on the following:
  • VLAN
  • Source IP
  • Destination IP
  • Source port
  • Destination port
  • RTP Port Range

Traffic Marking (Layer 2)

• By default our marking is 0.
• 8 different classes!

• Successive markings are "below" 0
• Mission critical: Spanning Tree, OSPF, other important protocols

802.1Q Header

• Priority bits can be added to get a traffic marking number

Layer 3 Traffic Marking

• occurs in the Type of Service field
• 64 values
• 13 Primary
• 0 is the default

Building Traffic Classification Rules

• Access Control List
• Classification
• Marking
• Expedited Forwarding
• Policing