Instruction/ maintenance manual of the product Switchblade AT-x900-12 Allied Telesis
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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.
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.
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.
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.
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.
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 m.
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.
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 .
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 .
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.
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.
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.
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.
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.
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.
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