code : stm#550 samsung electronics co., ltd. officeserv 7400 qos configuration distribution...

Code : STM#550Code : STM#550

Samsung Electronics Co., Ltd.

OfficeServ 7400 QoS Configuration OfficeServ 7400 QoS Configuration

Distribution

EnglishED01

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ObjectivesObjectives

After successful completion of the course the trainees should be able to execute the following activities.

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ContentsContents

GeneralGeneral

GWIM QoSGWIM QoS

GSIM QoSGSIM QoS

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GeneralGeneral

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L3/L2 QoS FunctionsL3/L2 QoS Functions

GWIMHTBQ

SPQ

GSIM L2 and L3 Integrated QoS Support.

Classification, DSCP Marking, Policing, Buffer Management (WRED-like)

IEEE 82.1p marking, CoS Mapping

Scheduling

GLIMPCoS Mapping, Scheduling

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VoIP QoSVoIP QoS

Auto-QoS supported by the DSMI (Data Server Module Interface) module.

GWIMAuto-configuration of NAPT for MCP and MGIs.

Auto – Firewall and auto-QoS support under development.

GSIM Auto-QoS supported.

auto-configuration of classification for VoIP trafficsauto-configuration of DSCP Marking for VoIP traffics.auto-configuration of IEEE 82.1p marking, CoS Mapping for VoIP traffics.

GLIMPCurrently auto-QoS not supported.

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Auto QoS for VoIPAuto QoS for VoIP

INTERNEINTERNETT

INTERNEINTERNETT

Auto- QoSAuto-Firewall

Auto- NAPT ServiceDSMI

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GWIM QoSGWIM QoS

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QoS Function OverviewQoS Function Overview

SPQ (Strict Priority Queuing)Highest class served first. Only if the waiting list in the highest class is empty, other classes can be served.

HTBQ (Hierarchical Token Bucket Queuing) Supports the classification/shaping/queuing functions

Less complexity than CBQ.

guarantee of configured bandwidth(Rate) and the on-demand distribution of excess bandwidth(BW Sharing)

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QoS Internal (I)QoS Internal (I)

Linux kernel TCprovides various Queuing Disciplines(Qdisc)

SPQ, HTBQ, CBQ,…

Root Qdisc is attached to device(interface). Arbitrary class tree can be created and attached to the Root Qdisc. Recursively, leaf classes can own another Qdisc as its own queuing policy.

If Packet is to transmit through one interface, it is classified as one of leaf classes according to configured filter rules and put into Qdisc attached to the leaf class. Iteratively, the packet is classified …

Queueing Discipline

Filter

Filter

Filter

Class

Class

Queueing Discipline

Queueing Discipline

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QoS Internal (II)QoS Internal (II)

HTBQ (Hierarchical Token Bucket Queuing)

3 types of class : root, inner, leafOnly leaf classes actually shape

packets; packets are only delayed in these leaf classes. The inner classes (all the way up to the root class) exist to define how borrowing/lending occurs.

2 token buckets per class : 1 for AR (Assured Rate), 1 for CR (Ceil Rate)

rate limiting (shaping) in only leaf classes.

BW borrowing up to CR from parent class by borrowing tokens (parent’s tokens).

If excess BW of the parent class is not available, the parent class attempt to borrow BW from parent of it. This can continue to reach Root class.

excess BW of inner class is distributed in the proportion of Quantum of demanding classes with highest priority.

Quantum = Rate / R2Q ; calculated automatically

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QoS Internal (III)QoS Internal (III)

SPQ (Strict Priority Queuing)PRIO qdisc used

doesn’t actually shape, only subdivides traffic based on how filters are configured.

3 types of class : high, middle, low => bands

priomap without tc filters, decide how to enqueue traffic according to TC_PRIO priority. GWIM supports only TC filters, so just ignore.

By default, each class contains pure FIFO qdisc. However, it can be replaced with any qdisc.

GWIM does not support this feature.

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Sample ScenarioSample Scenario

ScenarioEth0 used as WAN interfaceQoS support is needed for VoIP traffic transmitted via eth0.Total throughput 200Mbps = 25Mbyte/sVoIP (class VOIP)

RTP, RTCP – G.729 call with voice payload size of 20 bytes (20 ms)– (14 bytes of Ethernet header + 40 bytes of IP(20)/UDP(8)/RTP(12) headers +

20 bytes voice payload + 4 bytes of Ethernet CRC)* 8 bits per byte * 50 pps = 31.2 Kbps

– 31.2 * 256 (Assuming number of simultaneous calls)– AR = 8000 kbps (1000kbyte/s), CR = 2Mbyte/s, Priority = 1 (highest)

Signal– SIP, H.323, SPNet(Samsung Proprietary Networking) – Assuming 160 kbps = 20 KB/s (AR), CR = 40kbyte/s, Priority = 1 (highest)

AR = 8 Mbps (1Mbyte/s), CR = 3Mbyte/sData Traffic (class Data)

AR = Total throuput – VoIP Traffic = 24 Mbyte/s, CR = 25Mbyte/sTCP (class data_tcp)

– AR = 10Mbyte/s, CR = 25Mbyte/s , prio = 2Etc (default class)

– AR = 14Mbyte/s, CR = 25Mbyte/s prio = 3

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HTBQ Class DiagramHTBQ Class Diagram

Device Interface

pFIFO

Rate: 1MB/sCeil: 25MB/s

Rate: 3MB/sCeil: 25MB/s

Rate: 25 MB/s

class

Qdisc

Root

DataVOIP

tcp default

pFIFOpFIFO

Signal Voice

pFIFORate: 1000KB/s

Ceil: 25MB/sPri: 1

Rate: 20KB/sCeil: 25MB/s

Pri: 1

Rate: 2MB/sCeil: 25MB/s

Pri: 2

Rate: 1MB/sCeil: 25MB/s

Pri: 3

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Common Configuration : IP and Port GroupsCommon Configuration : IP and Port Groups

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Common Configuration : VoIP Filter Groups Common Configuration : VoIP Filter Groups

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Common Configuration : Data Filter Group Common Configuration : Data Filter Group

NoticeIf a packet matches more than one filters,

a filter of higher priority (lower value) will be selected.

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HTBQ Configuration – Root and Inner Classes HTBQ Configuration – Root and Inner Classes

Notebps, Kbps, and Mbps, which are the unit of the Rate and Ceil options,

mean 8 bits/s, 8 Kbits/s, and 8 Mbits/s respectively.

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HTBQ Configuration – VoIP Classes (I)HTBQ Configuration – VoIP Classes (I)

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HTBQ Configuration – VoIP Classes (II)HTBQ Configuration – VoIP Classes (II)

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HTBQ Configuration – Data ClassesHTBQ Configuration – Data Classes

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HTBQ Configuration – Default ClassesHTBQ Configuration – Default Classes

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HTBQ Configuration – Class Group ListHTBQ Configuration – Class Group List

NoteSet the rate of the parent class rate not to be less than a total of that of all child classes.

Set the ceil of the parent class not to be less than the maximum value of that of all child classes.

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Applying HTBQ Policy Applying HTBQ Policy

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Running HTBQ Running HTBQ

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SPQ Configuration : VOIP classSPQ Configuration : VOIP class

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SPQ Configuration : Data classSPQ Configuration : Data class

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SPQ Configuration – Root ClassSPQ Configuration – Root Class

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SPQ Configuration – Class Group ListSPQ Configuration – Class Group List

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Applying SPQ PolicyApplying SPQ Policy

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Running SPQRunning SPQ

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VoIP Service InteroperationVoIP Service Interoperation

GWIMGWIM

P1

P2

P3

SIO

V35

HSSI

RUN

V35

HSSI

P1

P2

P3RST

GLIMP

P1

P2

P3

P4

P5

P6

P7

P8

P9

P10

P11

P12

P13

P14

LNK

ACTL

NK

ACT

RST G

LIMP

P1

P2

P3

P4

P5

P6

P7

P8

P9

P10

P11

P12

P13

P14

LNK

ACTL

NK

ACT

RST

GPLIMGPLIM

MGI64

P1

P6

P2

P7

P3

P8

P4

P9

P5

P10

LNKACTSIO

GSIM

MP40

MGI64

INTERNET

VOIP(ToS 0xa0]

Data(ToS 0x0]

* Classification between VOIP and Data is done by GSIM (FFP hardware based) efficiently.

→ ToS byte of VoIP traffic (signal and media) is marked 0xa0.(DSCP = 40)

→ ToS byte of Data traffic (non-VoIP) is marked 0x0.(DSCP = 0)* Using this, GWIM needs only one ToS filter to classify VoIP traffic.

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GSIM QoSGSIM QoS

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GSIM QoS Architectures – based on BCM5696GSIM QoS Architectures – based on BCM5696

MASKing(Mask Table)

FILTERing(Rule Table)

Classification

METERing(Metering Table)

Full match

Marking & Policing

Actions(Rule Table)

Out-Actions(Rule Table)

In-profile out-of-profile

Buffer Manager(drop precedence packet/cell limit)

Queue Scheduler(SP, RR, WRR)

Shaper(per egress port)Packet out

Partial match

NO_MATCH_ACTION(Mask Table)

DROPMarkingMapping

drop_preECNIngress

Egress

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IngressIngress

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Configuration : Creating Class map (1) Configuration : Creating Class map (1)

Layer2 to Layer4 classification is supported.Layer2 to Layer4 classification is supported.

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Configuration : Creating Class Map (2) Configuration : Creating Class Map (2)

Noteif a class_map is created, it implicitly contains a class_entry as configured.

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Configuration : Creating Class EntryConfiguration : Creating Class Entry

NoteNew class entry’s match rule is inherited from that of its class map. So, only selected fields for the class map can be configured for class map entries. Especially, it is mandatory to configure range of IP or/and port fields of a class entry using the same bit-mask values as the class map. For above example, if netmask of class map for src/dest ip is 0xffffff00(/24), netmask of class entry for ip src/dest must be same. Also, this holds for port range. For above example, Mask value of source port is 0xfff0(/12).

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Configuration : Creating Policy Map (1)Configuration : Creating Policy Map (1)

NotePreviously configured class maps can be associated with a new policy map. An incoming packet is searched against class_maps in the ascendant manner. 10 is lowest (highest priority) sequence.If multiple class_maps are matched, incremental processing will be done but in case of conflicts (permit of one class_map, deny of the other), policy of class_map of lower se

quence number is applied.

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Configuration : Creating Policy Map (2)Configuration : Creating Policy Map (2)

NoteDefault action for all class_maps associated with a policy_map is permit as confirm action.

User can add/delete/modify actions.

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Configuration : Policy Actions (1)Configuration : Policy Actions (1)

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Configuration : Policy Actions (2)Configuration : Policy Actions (2)

NoteShaping by Token bucket. Limit (token rate), burst (bucket size)

If rate-limit is configured, actions are determined whether rate of traffic of this class is above limit or not.

traffic rate > limit => exceed actions are selected.

traffic rate <= limit => confirm actions are selected.

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Configuration : Policy Actions (3)Configuration : Policy Actions (3)

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Configuration : Service PolicyConfiguration : Service Policy

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EgressEgress

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Configuration : CoS MappingConfiguration : CoS Mapping

NoteA priority value for packet determined by 802.1p priority or configured priority by policy actions is mapped to a CoS queue according to CoS mapping. Multiple priority values can be mapped to one queue.

Threshold of WRED is configurable. Generally, CoS queue with low priority has shorter threshold than that of high priority. If CoS queue length is larger than threshold, packets with drop precedence as 1 are dropped.

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Configuration : SchedulerConfiguration : Scheduler

3 types scheduler modes Strict-priority

Round-robin

Weighted-round-robin

Weight value means packet count.

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