Category Archives: QOS

CoS and configuration: From JUNOS

Terminologies: Classification: examine the incoming packets and associate with a service. Behavior Aggregate: A method of classification. Single field is examined. (Cos bits) Multi-field classifier: A method of classification. Multiple fields are examined. Advertisements

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QOS Sample config

! class-map match-all voip match protocol rtp audio — enables NBAR and automatically selects IP-UDP-RTP audio traffic

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QOS resources and observations

Resources; Cisco QOS Certification Guide. Link IOS 12.2 – QOS Configuration Guide. Link DSCP, AF, EF . Link

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DSCP Names and binary

DSCP/CS Names and binary; “CS x”: First 3 binary digits determine the value of “x”. Last 3 digits will be zero. “AF xy” : First 3 binary digits determine the value of  “x”. Last 3 digit would be 010,100,110 for … Continue reading

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QOS Notes: Part-2

Chapter: 6 Traffic policing and shaping; Usually, policing is done on the ingress and shaping will be done on the egress. Policing typically drops out-of-contract traffic, whereas shaping typically delays it. Shaping: How it works;

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QOS Notes: Part -1

Chapter-1: QOS Basics 4 traffic character that QOS tool can affect; BW, Delay, Jitter, packet loss BW- number of bits per second CIR – committed information rate Clock rate vs Bandwidth CLI Clock-rate: actual L1 bit rate BW cli – … Continue reading

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