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Allied Telesis x900-48 series manual

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Table of contents for the manual

  • Page 1

    C613-16068-00 REV B www .alliedtelesis.com AlliedW ar e TM OS How T o | Intr oduction This document descri bes some generic configur ation examples for Quality of Service (QoS) on A T -9900 and x900 serie s switches running the AlliedW ar e OS. What information will y ou find in this document? This document pr ovides information on the following se[...]

  • Page 2

    Page 2 | AlliedW are™ OS Ho w T o Note: QoS co nfiguration 1 . Setting the egr ess rate 1 . Setting the egr ess rate Example 1 - 1 : Setting the egr ess limit of a switch por t Command: set switch port=24 egress limit=640 This command will set the egress limit of port 24 to 640kbps. The granularity is 640kbps. P or t 24[...]

  • Page 3

    Page 3 | AlliedW are™ OS Ho w T o Note: QoS co nfiguration 1 . Setting the egr ess rate Example 1 -2: setting the maximum bandwid th limit per ingr ess por t Ingress rate limiting cannot be configur ed on the por t per se, but is achieved b y creating a QoS policy with a bandwidth limited traffic class, and applying that policy to each port. This[...]

  • Page 4

    Page 4 | AlliedW are™ OS Ho w T o Note: QoS co nfiguration 1 . Setting the egr ess rate Example 1 -3: Setting the maximum band width limit for each user In example 1 - 1 , we configured an egr e ss rate on por t s. But the granularity of that bandwidth limiting was multiples of 640kbps. T o achieve a fi ner -g rained limiting on egre ss, it is ne[...]

  • Page 5

    Page 5 | AlliedW are™ OS Ho w T o Note: QoS co nfiguration 1 . Setting the egr ess rate Example 1 -4: Setting the maximum bandwidth limit for each IP subnet This example is very sim ilar to example 1 -3, except that it is assu med that a whole subnet is attached to each por t, not just a single device on each port. This set of commands will set t[...]

  • Page 6

    Page 6 | AlliedW are™ OS Ho w T o Note: QoS co nfiguration 1 . Setting the egr ess rate Example 1 -5: Setting the maximum ba ndwidth limit of VLANs Note: The por tgr oup feature is not supported before softwa r e release v2.7.5. If using an earlier softwar e release, use the port parameter on the policy instead. create class=1 vlan=2 create class[...]

  • Page 7

    Page 7 | AlliedW are™ OS Ho w T o Note: QoS co nfiguration 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 (VLAN/802. 1 p) priority per ingress port Here we assign differ ent 802. 1 p values to pack ets a rriving on diff erent ports. These values are also known as the La y er 2 (L2) o[...]

  • Page 8

    Page 8 | AlliedW are™ OS Ho w T o Note: QoS co nfiguration 2. Setting the priority on a pack et Example 2-2: Setting the La y er 2 (VLAN/802. 1 p) priority per VLAN This set of commands will set the La yer 2 pr iority of VLAN2, VLAN3 and VLAN4 traffics pack ets, received on ports 1 to 20, to 6, 5 and 4 r espectivel y . create class=1 vlan=2 creat[...]

  • Page 9

    Page 9 | AlliedW are™ OS Ho w T o Note: QoS co nfiguration 2. Setting the priority on a pack et Example 2-3: Setting the La y er 3 (T OS/DCSP) priority per ingress port Use the same configu ration pro vided i n Example 2- 1 on page 7 , but change the following line: set qos dscpmap=premarkin g dscp=< incoming-dscp > newpriority=< new- pr[...]

  • Page 10

    Page 10 | AlliedW are™ OS Ho w T o Note: QoS configuration 3. Setting the egr ess queues 3. Setting the egr ess queues In this section we look at methods f or direct ing certain packets into certain queues on the egress port. Example 3- 1 : Setting the egress queue accor din g to the L2 priority of the incoming pack et The priority-to-queue map i[...]

  • Page 11

    Page 11 | AlliedW are™ OS Ho w T o Note: QoS configuration 3. Setting the egr ess queues Example 3-2: Setting the egress qu eue according to the ingr ess port This set of commands will set the egress queue of an y traffic receiv ed from port 1 to egress queue 6, from port 2 to egress queue 5, etc . create class=1 create qos flow=1 add qos flow=1 [...]

  • Page 12

    Page 12 | AlliedW are™ OS Ho w T o Note: QoS configuration 3. Setting the egr ess queues Example 3-3: Configuring WRR for egr ess queues This example is used for configuring WRR on eg ress queues accor ding to the ingress port of the traffic. This set of commands will set the egress queue of an y traffic receiv ed from port 1 to egress queue 6, f[...]

  • Page 13

    Page 13 | AlliedW are™ OS Ho w T o Note: QoS configuration Full QoS scenario 1 : tier ed ser vices for a single customer Full QoS scenario 1 : tier ed ser vices f or a single customer In this section, we will build up a r elatively complex QoS configuration to support a scenario r equiring quite precise contr ol over th e traffic passing thr ough[...]

  • Page 14

    Page 14 | AlliedW are™ OS Ho w T o Note: QoS configuration Full QoS scenario 1 : tier ed ser vices for a single customer Bronz e traffic is also allow ed to burst up to the full egr ess bandwidth of the uplink port, but when congestion occurs, will be thr ottled back in fav our of Gold traffic , and will share the r ema ining bandwidth with Silv [...]

  • Page 15

    Page 15 | AlliedW are™ OS Ho w T o Note: QoS configuration Full QoS scenario 1 : tier ed ser vices for a single customer The act of assigning packets in a particular traffic class to a par ticular egress queue is achiev ed in the pre-marking process. This r equ ires that the pre-marking DSCP map table be set up to send packets to a ppropriate que[...]

  • Page 16

    Page 16 | AlliedW are™ OS Ho w T o Note: QoS configuration Full QoS scenario 1 : tier ed ser vices for a single customer The Gold traffic must be strictly limited to 2Mbps This is achiev ed by configuring a maxbandwid th on that traffic class, and dropping bandwidthclass 3 traffic: set qos trafficclass=3 ma xbandwidth=2mbps maxburst=20Kbytes drop[...]

  • Page 17

    Page 17 | AlliedW are™ OS Ho w T o Note: QoS configuration Full QoS scenario 1 : tier ed ser vices for a single customer RED cur ves—a r efresher Random Early Disc ard cur ve s are bandwidth clas s a ware, and can drop low er priority packets when sev ere congestion occurs, with pr ogr essiv ely mor e and higher priority pack ets dropped until [...]

  • Page 18

    Page 18 | AlliedW are™ OS Ho w T o Note: QoS configuration Full QoS scenario 2: bandwidth limiting of m ultiple customers Full QoS scenario 2: bandwidth limiting of multiple customers In this section, we will build up another r e lativel y complex QoS configuration to suppor t a differ ent scenario. The scenario is an ISP pr oviding connectivity [...]

  • Page 19

    Page 19 | AlliedW are™ OS Ho w T o Note: QoS configuration Full QoS scenario 2: bandwidth limiting of m ultiple customers The configuration r equired to impose these bandwidth limits would be: Limiting the outgoing traffic: create qos policy=1 dtcdr opbwclass3=yes dtcmaxbandwidth=1Mbps dtcmaxburst=10Kb create qos policy=2 dtcdr opbwclass3=yes dtc[...]

  • Page 20

    Page 20 | AlliedW are™ OS Ho w T o Note: QoS configuration Full QoS scenario 2: bandwidth limiting of m ultiple customers create qos traff=9 set qos traff=9 maxband=5 Mbps maxburst=10Kb dropbwc=yes add qos traff=9 flow=9 create qos traff=10 set qos traff=10 maxband= 2Mbps maxburst=10Kb dropbwc=yes add qos traff=10 flow=10 create qos poli=6 add qo[...]

  • Page 21

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