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Allied Telesis Switchblade AT-x900-12 manual

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Table of contents for the manual

  • Page 1

    AlliedW ar e Plus TM OS How T o | C613-16112-00 REV A www .alliedtelesis .com Intr oduction This document describe s some generic configur ation examples f or Quality of Ser vice (QoS) on the AlliedW ar e Plus OS. What information will y ou find in this document? This document pro vides information in the follo wing sections: • 1. Setting the egr[...]

  • Page 2

    Page 2 | AlliedW ar e Plus™ OS How T o Note: QoS 1. Setting the eg ress rat e 1. Setting the egr ess rate Example 1-1: Setting the eg r ess limit of a switch p or t Commands: interface port1.0.24 egress-rate-limit 25m These commands will set t he egr ess limit of port 24 to 25Mbps. The granular ity is 651kbps. P or t 24[...]

  • Page 3

    Page 3 | AlliedW ar e Plus™ OS How T o Note: QoS 1. Setting the eg ress rat e Example 1-2: setting the maximum bandwidth limit per ingr ess port Ingress rate limiting cannot be configur ed on the por t per se , but is achiev ed by cr eating a QoS policy with a bandwidth limited traffic class, and applying that policy to each port. This set of com[...]

  • Page 4

    Page 4 | AlliedW ar e Plus™ OS How T o Note: QoS 1. Setting the eg ress rat e Example 1-3: Setting the maximu m bandwidth limit f or each user In example 1-1, w e configured an egress rate on ports . But the granularity of that bandwid th limiting was multiples of 651kbps. It is possible to achieve finer -grained limiting using the devices advanc[...]

  • Page 5

    Page 5 | AlliedW ar e Plus™ OS How T o Note: QoS 1. Setting the eg ress rat e Example 1-4: Setting the maximum ba ndwidth limit f or each IP subnet This example is very similar to example 1-3, exce pt that it is assumed that a whole subnet is attached to each port, not just a single device on each port. This set of commands will set the total egr[...]

  • Page 6

    Page 6 | AlliedW ar e Plus™ OS How T o Note: QoS 1. Setting the eg ress rat e Example 1-5: Setting the maxi mum bandwidth limit of VLANs mls qos enable class-map cmap2 match vlan 2 class-map cmap3 match vlan 3 class-map cmap4 match vlan 4 mls qos enable mls qos aggregate-police agg1 single-rate 256 3000 5000 exceed-action drop mls qos aggregate-p[...]

  • Page 7

    Page 7 | AlliedW ar e Plus™ OS How T o Note: QoS 2. Setting the priority on a pack et 2. Setting the priority on a pack et Example 2-1: Setting the La y er 2 (VLA N/802.1p) priority per ingress port Her e we assign differ ent 802.1p values to packets ar riving on differ ent ports. These values ar e also known as the Lay er 2 (L2) or VLAN priority[...]

  • Page 8

    Page 8 | AlliedW ar e Plus™ OS How T o Note: QoS 2. Setting the priority on a pack et Example 2-2: Setting the La y er 2 (VLAN/802.1p) priority per VLAN This set of commands will set the La yer 2 priority of VLAN2, VLAN3 and VLAN4 traffics pack ets, receiv ed on por ts 1 to 20, to 6, 5 and 4 r espectivel y . mls qos enable class-map cmap2 match v[...]

  • Page 9

    Page 9 | AlliedW ar e Plus™ OS How T o Note: QoS 2. Setting the priority on a pack et Example 2-3: Setting the La y er 3 (T OS/DCSP) priority per ingr ess por t Use the same configuration pr ovided in Example 2-1 on page 7 , but change the following line: set cos <cos-value> to set dscp <dscp-value> Example 2-4: Setting the La y er 3 [...]

  • Page 10

    Page 10 | AlliedW are Plus™ OS How T o Note: QoS 3. Setting the egr ess queues 3. Setting the egr ess queues In this section we look at methods f o r dir ecting certain packets into certain queues on the egress port. Example 3-1: Setting the egr ess queue a ccording to the L2 priority of the incoming pack et The priority-to-queue map is a straigh[...]

  • Page 11

    Page 11 | AlliedW are Plus™ OS How T o Note: QoS 3. Setting the egr ess queues Example 3-2: Setting th e egr ess queue according to the ingr ess por t This set of commands will set the egress queue of an y traffic r eceived fr om por t 1 to egress queue 6, fr om port 2 to egress queue 5 … etc. mls qos enable class-map cmap1 policy-map pmap1 cla[...]

  • Page 12

    Page 12 | AlliedW are Plus™ OS How T o Note: QoS 3. Setting the egr ess queues Example 3-3: Configuring WRR for egr ess queues This example is used for configuring WRR on egr e ss queues according to the ingr ess por t of the traffic. This set of commands will set the egress queue of an y traffic received fr om por t 1 to egress queue 6, fr om po[...]

  • Page 13

    Page 13 | AlliedW are Plus™ OS How T o Note: QoS Full QoS scenario - tiered services for a single customer Full QoS scenario - tier ed ser vices for a single customer In this section, we will build up a r elatively complex QoS configuration to support a scenario requiring quite pr ecise control ov er the traffic passing through the switch. The sc[...]

  • Page 14

    Page 14 | AlliedW are Plus™ OS How T o Note: QoS Full QoS scenario - tiered services for a single customer Identify the types of traffic The differ ent categories of traffic w ill be identified b y the DSCP values in the packets' headers. It is up to the customer to mark the pack ets with the appropriate DSCP values. The DSCP values belongin[...]

  • Page 15

    Page 15 | AlliedW are Plus™ OS How T o Note: QoS Full QoS scenario - tiered services for a single customer What is requir ed is that: • Gold traffic AL W A YS has pr ecedence over Silv er or Bronze traffic. So , when a Gold pack et arriv es at the egress port, it is transmitted immediatel y , irrespectiv e of how many Silv er or Bronze pack ets[...]

  • Page 16

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