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CHAPTER 14: QOS (Need (Latency and Jitter (Propagation Delay (fixed),…
CHAPTER 14:
QOS
Need
Lack of Bandwidth
Latency and Jitter
Propagation Delay (fixed)
Serialization Delay (fixed)
Processing Delay (fixed)
Delay variation (jitter)
Packet Loss
Models
Best Effort
Integrated Services (IntServ)
RSVP
Differentiated Services (DiffServ)
Classification and Marking
Classification
Internal (QoS Groups)
Layer 1
Layer 2 (MAC address, 801.2p CoS bits)
Layer 2.5 (MPLS EXP bit)
Layer 3 (IPP and DSCP)
Layer 4 (TCP or UDP port)
Layer 7 (NBAR2)
Protocol Discovery
Modular CLI (MQC)
Marking
Layer 2
802.1Q
TPID (0x8100)
TCI
Priority Code Point PCP)
Drop Elegibility Indicator (DEI)
VLAN ID
Layer 3
ToS Field
IP Precedence
DiffServ Field
DSCP
ECN
DSCP PHB
DF: Default Forwarding
CS: Class Selector
AF: Assured Forwarding
EF: Expedited Forwarding
Trust Boundary
Accept QoS values
Reject QoS Values
Congestion Management and Avoidance
Congestion Management
CBWFQ
LLQ
Congestion Avoidance
Tail Drop
WTD
WRED
Policing and Shaping
Policers
Single-Rate Two-Color
CIR
Conform
Exceed
Single-Rate Three-Color
Two-Single Three-Color
Violate
PIR
Exceed
CIR
Conform