QoS module

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The Quality of Service module processes and displays traffic with QoS tags for IP DSCP on layer 3 and VLAN PCP and MPLS TC on layer 2. For every tag the corresponding network traffic is accounted and a list of IP addresses for which the QoS tag has been seen is available

Layer 2 QoS

For layer 2 VLAN priority code points and MPLS traffic classes are analysed and displayed in a table with traffic counters, a history graph of traffic over time and a PCAP button that certain QoS tag.

VLAN priority code point

VLAN priority code point (PCP) values are displayed as defined by IEEE 802.1Q-2005.

PCP Priority Short name Description
1 0 (lowest) BK Background
0 1 (default) BE Best effort
2 2 EE Excellent effort
3 3 CA Critical applications
4 4 VI Video, < 100 ms latency and jitter
5 5 VO Voice, < 10 ms latency and jitter
6 6 IC Internetwork control
7 7 (highest) NC Network control

MPLS traffic class

MPLS traffic class (TC) values are displayed as a number only. The TC value is intended to be flexible according to RFC5462. The old name of that field was EXP (experimental).

Layer 3 QoS

For layer 3 IP differentiated services codepoint (DSCP) are displayed in a table with traffic counters, a history graph of traffic over time and a PCAP button for that certain DSCP value. DSCP values are displayed as defined by RFC4594.

Service class name DSCP name DSCP value
Network Control CS6 48
Telephony EF 46
Voice Admit VOICE-ADMIT 44
Signaling CS5 40
Multimedia Conferencing AF41, AF42, AF43 34, 36, 38
Real-Time Interactive CS4 32
Multimedia Streaming AF31, AF32, AF33 26, 28, 30
Broadcast Video CS3 24
Low-Latency Data AF21, AF22, AF23 18, 20, 22
OAM CS2 16
High-Throughput Data AF11, AF12, AF13 10, 12, 14
Standard DF (CS0) 0
Low-Priority Data CS1 8

Additionally legacy Type of Service values as defined by RFC791 and RFC1349 are displayed if DSCP is not used. Consider following DSCP and Type of Service compatibility map.

ToS value ToS Precedence ToS Delay flag ToS Throughput flag ToS Reliability flag DSCP value DSCP name
0 Routine 0 0 0 0 Standard
4 Routine 0 0 1 1 Standard
8 Routine 0 1 0 2 Standard
12 Routine 0 1 1 3 Standard
16 Routine 1 0 0 4 Standard
32 Priority 0 0 0 8 CS1
40 Priority 0 1 0 10 AF11
48 Priority 1 0 0 12 AF12
56 Priority 1 1 0 14 AF13
64 Immediate 0 0 0 16 CS2
72 Immediate 0 1 0 18 AF21
80 Immediate 1 0 0 20 AF22
88 Immediate 1 1 0 22 AF23
96 Flash 0 0 0 24 CS3
104 Flash 0 1 0 26 AF31
112 Flash 1 0 0 28 AF32
120 Flash 1 1 0 30 AF33
128 Flash Override 0 0 0 32 CS4
136 Flash Override 0 1 0 34 AF41
144 Flash Override 1 0 0 36 AF42
152 Flash Override 1 1 0 38 AF43
160 Critical 0 0 0 40 CS5
176 Critical 1 0 0 44 Voice Admit
184 Critical 1 1 0 46 EF
192 Internetwork Control 0 0 0 48 CS6
224 Network Control 0 0 0 56 CS7

QoS details

By clicking on a QoS tag a details page with all seen IPs for that certain QoS tag is displayed. The traffic of the certain IP for that certain QoS tag is shown.