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Enterprise IP Solutions. OfficeServ 7400. Quick Install Guide - Data Server – GWIM QoS. Mar, 2006 OfficeServ Lab. Samsung Electronics Co., Ltd. GWIM SPQ(Strict Priority Queuing) - PowerPoint PPT Presentation

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  • OfficeServ 7400Enterprise IP SolutionsQuick Install Guide - Data Server GWIM QoSMar, 2006

    OfficeServ Lab.Samsung Electronics Co., Ltd.

    7400Samsung Confidential & Proprietary InformationCopyright 2006, All Rights Reserved.-*/26-

    GWIM 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 functionsLess complexity than CBQ. guarantee of configured bandwidth(Rate) and the on-demand distribution of excess bandwidth(BW Sharing) OS7400 QoS Function Overview

    7400Samsung Confidential & Proprietary InformationCopyright 2006, All Rights Reserved.-*/26-

    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 GWIM QoS Internal (I)

    Queueing Discipline

    Filter

    Filter

    Filter

    Class

    Class

    Queueing Discipline

    Queueing Discipline

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    GWIM QoS Internal (II)HTBQ(Hierarchical Token Bucket Queuing) - 3 types of class : root, inner, leaf Only 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 ctokens(parents 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

    7400Samsung Confidential & Proprietary InformationCopyright 2006, All Rights Reserved.-*/26-

    GWIM QoS Internal (III)SPQ(Strict Priority Queuing) - PRIO qdisc used - doesnt 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.

    7400Samsung Confidential & Proprietary InformationCopyright 2006, All Rights Reserved.-*/26-

    Eth0 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)SignalSIP, 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

    Sample Scenario

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    Device InterfacepFIFORate: 1MB/sCeil: 25MB/sRate: 3MB/sCeil: 25MB/sRate: 25 MB/sHTBQ Class DiagramclassQdiscRootDataVOIPtcpdefaultpFIFOpFIFOSignalVoicepFIFORate: 1000KB/sCeil: 25MB/sPri: 1Rate: 20KB/sCeil: 25MB/sPri: 1Rate: 2MB/sCeil: 25MB/sPri: 2Rate: 1MB/sCeil: 25MB/sPri: 3

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    Common Configuration : IP and Port Groups

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    Common Configuration : VoIP Filter Groups

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    If a packet matches more than one filters, a filter of higher priority(lower value) will be selected. NoteCommon Configuration : Data Filter Group

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    bps, 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. NoteHTBQ Configuration Root and Inner Classes

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    HTBQ Configuration VoIP Classes(I)

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    HTBQ Configuration VoIP Classes(II)

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    HTBQ Configuration Data Class

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    HTBQ Configuration Default Class

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    1. Set the rate of the parent class rate not to be less than a total of that of all child classes. 2. Set the ceil of the parent class not to be less than the maximum value of that of all child classes. NoteHTBQ Configuration Class Group List

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    Applying HTBQ Policy

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    Running HTBQ

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    SPQ Configuration : VOIP class

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    SPQ Configuration : Data class

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    SPQ Configuration Root Class

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    SPQ Configuration Class Group List

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    Applying SPQ Policy

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    Running SPQ

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    VoIP Service InteroperationGWIMGPLIMGPLIMMGI64GSIMINTERNETVOIP(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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