Allied Telesis x900-48 series Instruction and safety manual

C613-16068-00 REV B www.alliedtelesis.com
AlliedWareTM OS
How To |
Introduction
This document describes some generic configuration examples for Quality of Service (QoS)
on AT-9900 and x900 series switches running the AlliedWare OS.
What information will you find in this document?
This document provides information on the following sections:
z" 1 . Setting the egress rate" on page 2
z"2. Setting the priority on a packet" on page 7
z"3. Setting the egress queues" on page 10
z"Full QoS scenario 1 : tiered services for a single customer" on page 13
z"Full QoS scenario 2: bandwidth limiting of multiple customers" on page 18
Which product and software version does this information apply to?
This How To Note applies to the following Allied Telesis switches, running the AlliedWare
OS software version 2.7.
1 or later:
zAT-9924SP, AT-9924T, AT-9924T/4SP
zx900-48 series
zx900-24 series
zAT-8948
Configure QoS on AT-9900, x900-48, and x900-24
Series Switches

Page 2 | AlliedWare™ OS How To Note: QoS configuration
1 . Setting the egress rate
1 . Setting the egress rate
Example 1 - 1 : Setting the egress limit of a switch port
Command:
set switch port=24 egresslimit=640
This command will set the egress limit of port 24 to 640kbps. The granularity is 640kbps.
Port 24

Page 3 | AlliedWare™ OS How To Note: QoS configuration
1 . Setting the egress rate
Example 1 -2: setting the maximum bandwidth limit per ingress port
Ingress rate limiting cannot be configured on the port per se, but is achieved by creating a
QoS policy with a bandwidth limited traffic class, and applying that policy to each port.
This set of commands will set the ingress rate of traffic received per port from ports
1 to 20
to various different values. Note that classifier=
1 matches every packet. The granularity of
the rate limiting is around
1 kbps.
create class=1
create qos flow=1
add qos flow=1 class=1
create qos traff=1
add qos traff=1 flow=1
set qos traff=1 maxbandwidth=128kbps maxburst=5kbyte dropbw=yes
create qos poli=1
add qos poli=1 traff=1
set qos port=1 poli=1
create qos flow=2
add qos flow=2 class=1
create qos traff=2
add qos traff=2 flow=2
set qos traff=2 maxbandwidth=256kbps maxburst=5kbyte dropbw=yes
create qos poli=2
add qos poli=2 traff=2
set qos port=2 poli=2
create qos flow=3
add qos flow=3 class=1
create qos traff=3
add qos traff=3 flow=3 remarking=priority
set qos traff=3 maxbandwidth=64kbps maxburst=5kbyte dropbw=yes
create qos poli=3
add qos poli=3 traff=3
set qos port=3 poli=3
...
Port 24
Ingress ports 1-20

Page 4 | AlliedWare™ OS How To Note: QoS configuration
1 . Setting the egress rate
Example 1 -3: Setting the maximum bandwidth limit for each user
In example 1 - 1 , we configured an egress rate on ports. But the granularity of that bandwidth
limiting was multiples of 640kbps. To achieve a finer-grained limiting on egress, it is necessary
to make use of traffic classes. In this example we assume that there is one device with a
known IP address, attached to each port. A traffic class will be created for each such IP
address, and a maximum bandwidth applied to the traffic class.
This set of commands will set the total egress limit (download traffic) for each user to
256kbps. The granularity is around
1 kbps.
create class=1 ipda=192.168.1.1
create class=2 ipda=192.168.1.2
create class=3 ipda=192.168.1.3
...
create qos flow=1
add qos flow=1 class=1
create qos traf=1
add qos traf=1 flow=1
set qos traf=1 maxbandw=256kbps maxburst=5kbyte dropbw=yes
create qos flow=2
add qos flow=2 class=2
create qos traf=2
add qos traf=2 flow=2
set qos traf=2 maxbandw=256kbps maxburst=5kbyte dropbw=yes
create qos flow=3
add qos flow=3 class=3
create qos traf=3
add qos traf=3 flow=3
set qos traf=3 maxbandw=256kbps maxburst=5kbyte dropbw=yes
...
create qos poli=1
add qos poli=1 traff=1-23
set qos port=24 poli=1
Port 24
Internet
connection
Users connected to the switch downloading files fromthe Internet
(192.168.1.1-192.168.1.25)

Page 5 | AlliedWare™ OS How To Note: QoS configuration
1 . Setting the egress rate
Example 1 -4: Setting the maximum bandwidth limit for each IP subnet
This example is very similar to example 1 -3, except 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 egress limit (download traffic) for each subnet to
256kbps. The granularity is around
1 kbps.
create class=1 ipda=192.168.1.0/24
create class=2 ipda=192.168.2.0/24
create class=3 ipda=192.168.3.0/24
...
create qos flow=1
add qos flow=1 class=1
create qos traf=1
add qos traf=1 flow=1
set qos traf=1 maxbandw=256kbps maxburst=5kbyte dropbw=yes
create qos flow=2
add qos flow=2 class=2
create qos traf=2
add qos traf=2 flow=2
set qos traf=2 maxbandw=256kbps maxburst=5kbyte dropbw=yes
create qos flow=3
add qos flow=3 class=3
create qos traf=3
add qos traf=3 flow=3
set qos traf=3 maxbandw=256kbps maxburst=5kbyte dropbw=yes
...
create qos poli=1
add qos poli=1 traff=1-23
set qos port=24 poli=1
Port 24
Internet
connection
Users connected to the switch downloading files fromthe Internet
(192.168.1.0/24 - 192.168.23.0/24)

Page 6 | AlliedWare™ OS How To Note: QoS configuration
1 . Setting the egress rate
Example 1 -5: Setting the maximum bandwidth limit of VLANs
Note: The portgroup feature is not supported before software release v2.7.5. If using an
earlier software release, use the port parameter on the policy instead.
create class=1 vlan=2
create class=2 vlan=3
create class=3 vlan=4
create qos flow=1
add qos flow=1 class=1
create qos flow=2
add qos flow=2 class=2
create qos flow=3
add qos flow=3 class=3
create qos traff=1
add qos traff=1 flow=1
set qos traff=1 maxbandw=256kbps maxburst=5kbyte dropbw=yes
create qos traff=2
add qos traff=2 flow=2
set qos traff=2 maxbandw=256kbps maxburst=5kbyte dropbw=yes
create qos traff=3
add qos traff=3 flow=3
set qos traff=3 maxbandw=256kbps maxburst=5kbyte dropbw=yes
create qos poli=1
add qos poli=1 traff=1,2,3
create qos portgroup=1 ports=1-20
set qos portgroup=1 policy=1
Port 24
Ingress ports 1-20 (these ports are carrying a mixture of
VLAN2, VLAN3 and VLAN4 packets, either with or without VLAN tags)

Page 7 | AlliedWare™ OS How To Note: QoS configuration
2. Setting the priority on a packet
2. Setting the priority on a packet
Example 2- 1 : Setting the Layer 2 (VLAN/802. 1 p) priority per ingress port
Here we assign different 802. 1 p values to packets arriving on different ports.
These values are also known as the Layer 2 (L2) or VLAN priority.
create class=1
create qos flow=1
add qos flow=1 class=1
create qos traff=1
add qos traff=1 flow=1
set qos traff=1 mark=11 premarking=usemark
set qos dscpmap=premarking dscp=11 newpriority=6
create qos poli=1
add qos poli=1 traff=1
set qos port=1 poli=1
create class=2
create qos flow=2
add qos flow=2 class=2
create qos traff=2
add qos traff=2 flow=2
set qos traff=2 mark=12 premarking=usemark
set qos dscpmap=premarking dscp=12 newpriority=5
create qos poli=2
add qos poli=2 traff=2
set qos port=2 poli=2
create class=3
create qos flow=3
add qos flow=3 class=3
create qos traff=3
add qos traff=3 flow=3 remarking=priority
set qos traff=3 mark=13 premarking=usemark
set qos dscpmap=premarking dscp=13 newpriority=4
create qos poli=3
add qos poli=3 traff=3
set qos port=3 poli=3
...
Port 24
Ingress ports 1-20 (these ports MAY be carrying a mixture of
packets fromdifferent VLAN packets, either with or without VLAN tags)

Page 8 | AlliedWare™ OS How To Note: QoS configuration
2. Setting the priority on a packet
Example 2-2: Setting the Layer 2 (VLAN/802. 1 p) priority per VLAN
This set of commands will set the Layer 2 priority of VLAN2, VLAN3 and VLAN4 traffics
packets, received on ports
1 to 20, to 6, 5 and 4 respectively.
create class=1 vlan=2
create class=2 vlan=3
create class=3 vlan=4
create qos flow=1
add qos flow=1 class=1
create qos flow=2
add qos flow=2 class=2
create qos flow=3
add qos flow=3 class=3
create qos traff=1
add qos traff=1 flow=1
set qos traff=1 mark=11 premarking=usemark
set qos dscpmap=premarking dscp=11 newpriority=6
create qos traff=2
add qos traff=2 flow=2
set qos traff=2 mark=12 premarking=usemark
set qos dscpmap=premarking dscp=12 newpriority=5
create qos traff=3
add qos traff=3 flow=3 remarking=priority
set qos traff=3 mark=13 premarking=usemark
set qos dscpmap=premarking dscp=13 newpriority=4
create qos poli=1
add qos poli=1 traff=1,2,3
set qos port=1-20 poli=1
Port 24
Ingress ports 1-20 (these ports MAY be carrying a mixture ofVLAN2,
VLAN3, and VLAN4 packets either with or without VLAN tags)

Page 9 | AlliedWare™ OS How To Note: QoS configuration
2. Setting the priority on a packet
Example 2-3: Setting the Layer 3 (TOS/DCSP) priority per ingress port
Use the same configuration provided in Example 2- 1 on page 7, but change the following line:
set qos dscpmap=premarking dscp=<incoming-dscp> newpriority=<new-
priority>
to
set qos dscpmap=premarking dscp=<incoming-dscp> newdscp=<new-value>
Example 2-4: Setting the Layer 3 (TOS/DSCP) priority per VLAN
Use the same configuration provided in Example 2-2 on page 8, but change the following line:
set qos dscpmap=premarking dscp=<incoming-dscp> newpriority=<new-
priority>
to
set qos dscpmap=premarking dscp=<incoming-dscp> newdscp=<new-dscp>

Page 10 | AlliedWare™ OS How To Note: QoS configuration
3. Setting the egress queues
3. Setting the egress queues
In this section we look at methods for directing certain packets into certain queues on the
egress port.
Example 3- 1 : Setting the egress queue according to the L2 priority of the
incoming packet
The priority-to-queue map is a straightforward method for assigning packets to egress on the
basis of the packets’ 802.
1 p values.
Command
settings
The first command sets the mapping between the VLAN Tag User Priorities of the packets
and the egress queues. Priorities 0 to 7 are mapped to queues 2, 3,
1 , 0, 4, 5, 6 and 7
respectively.
The second command sets the incoming ports to send untagged packets to queue number 2,
which means the untagged packets will use the same queue as the tagged packets with a User
Priority of
1 .
set qos prio2queuemap=2,3,1,0,4,5,6,7
set qos port=1-20 defaultque=2
Port 24
Ingress ports 1-20 (these ports MAY be carrying a mixture ofpackets
fromdifferent VLAN packets either with or without VLAN tags)