Quality of Service
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Quality of Service overview...................................................................................................................................... 11
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QoS for Ruckus ICX stackable devices....................................................................................................................15
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QoS queues............................................................................................................................................................ 16
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QoS priorities-to-traffic assignment..........................................................................................................................18
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QoS marking........................................................................................................................................................... 19
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DSCP and CoS global re-marking .......................................................................................................................... 19
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DSCP-based QoS configuration.............................................................................................................................. 22
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QoS mapping configuration.....................................................................................................................................23
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QoS scheduling and queuing methods....................................................................................................................23
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IPv6 QoS.................................................................................................................................................................25
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Flow control and buffer management...................................................................................................................... 25
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Packet buffer management..................................................................................................................................... 27
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Configuring QoS......................................................................................................................................................28
Quality of Service overview
Quality of Service (QoS) provides preferential treatment to specific traffic.
Quality of Service (QoS) features are used to prioritize the use of bandwidth in a switch. When QoS features are enabled, traffic is classified
as it arrives at the switch, and processed through on the basis of configured priorities. Traffic can be dropped, prioritized for guaranteed
delivery, or subject to the delivery options as configured by a number of different mechanisms.
Classification
is the process of selecting packets on which to perform QoS, reading or ignoring the QoS information, and assigning a priority
to the packets. The classification process assigns a priority to packets as they enter the switch. These priorities can be determined on the
basis of information contained within the packet or assigned to the packet as it arrives at the switch. Once a packet or traffic flow is
identified and marked, then it is mapped to a forwarding priority queue.
Packets on Ruckus devices are classified in up to eight traffic classes with values from 0 to 7. Packets with higher priority classifications are
given a precedence for forwarding.
There are two traffic types in QoS:
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Data—These can be either network-to-network traffic or traffic from the CPU. QoS parameters can be assigned and modified for
data traffic. The device also supports setting or modifying the IEEE 802.1p user priority or the IP header DSCP field..
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Control—Packets to and from the CPU is considered control traffic. The QoS parameters associated with the control traffic are
preassigned and not configurable.
Classified traffic processing
The
trust level
in effect on an interface determines the type of QoS information the device uses for performing QoS.
A Ruckus ICX device establishes the trust level based on the configuration of various features and whether the traffic is switched or routed.
The trust level can be one of the following:
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Ingress port default priority.
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Static MAC address—If the packet does not matches on an ACL that defines a priority and the MAC address of the packet
matches a static entry, the packet is classified with the priority of the static MAC entry.
Ruckus FastIron QoS and Traffic Management Configuration Guide, 08.0.70
Part Number: 53-1005294-01
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