Networks Horizon

Quality of Service (QoS)-Part2

QOS deploying Methods


==>CLI-Command Line Interface 

•  Legacy Method
•  Interface by Interface config
•  Non Scalable as MQC
•  Old method
• Configuration overhead

==>MQC-Modular QoS CLI

• Class Maps,Policy Maps and service map
• Create groups of policies.

==>Auto QoS

•  Just a command with few parameters
•  Template based
• Need to tune based on network specification.

==>QoS policy Manager (QPM)


Ciscoworks and QPM

•  Gives graphical view of network
•  Integrate into cisco works
•  It can deploy QOS on whole network simultaneously and consistently.

QOS Mechanism


1.Classification

•  (Class Maps)

2.Marking

•  (Policy Maps)

3.Congestion Management

•  Various Queuing methods

4.Congestion Avoidance

•  FIFO and Tail Drop default
•  Random Early Detection (RED)
•  Explicit Congestion Notification (ECN)
•  Weighted RED (WRED)

5.POLICING and SHAPING

•  Policing drops (or remarks) excessive traffic
•  Shaping delays excessive traffic

6.Link Efficiency Tools

•  Link  Fragmentation and Interleaving (LFI) -Chip Chop big packets
•  Compression