Dell FCX624-I Laptop User Manual


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PowerConnect B-Series FCX Configuration Guide xvii
53-1002266-01
QoS for stackable devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .595
QoS profile restrictions in an IronStack . . . . . . . . . . . . . . . . . .595
QoS behavior for trusting Layer 2 (802.1p) in an IronStack . .595
QoS behavior for trusting Layer 3 (DSCP) in an IronStack . . .595
QoS behavior on port priority and VLAN priority
in an IronStack. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .596
QoS behavior for 802.1p marking in an IronStack . . . . . . . . .596
QoS queues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .596
Assigning QoS priorities to traffic. . . . . . . . . . . . . . . . . . . . . . . . . . .596
Changing a port priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .597
Assigning static MAC entries to priority queues. . . . . . . . . . . .597
Buffer allocation/threshold for QoS queues . . . . . . . . . . . . . .598
802.1p priority override . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .598
Configuration notes and feature limitations . . . . . . . . . . . . . .598
Enabling 802.1p priority override . . . . . . . . . . . . . . . . . . . . . . .598
Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .599
Configuring DSCP-based QoS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .599
Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .599
Using ACLs to honor DSCP-based QoS . . . . . . . . . . . . . . . . . . .599
Configuring the QoS mappings. . . . . . . . . . . . . . . . . . . . . . . . . . . . .600
Default DSCP to internal forwarding priority mappings. . . . . .600
Changing the DSCP to internal forwarding
priority mappings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .601
Changing the VLAN priority 802.1p to hardware
forwarding queue mappings . . . . . . . . . . . . . . . . . . . . . . . . . . .602
8 to 4 queue mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .602
Scheduling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .603
QoS queuing methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .603
Selecting the QoS queuing method . . . . . . . . . . . . . . . . . . . . .605
Configuring the QoS queues . . . . . . . . . . . . . . . . . . . . . . . . . . .605
Viewing QoS settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .608
Viewing DSCP-based QoS settings. . . . . . . . . . . . . . . . . . . . . . . . . .608
Chapter 18 Configuring Traffic Policies
Traffic policies overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .611
Configuration notes and feature limitations . . . . . . . . . . . . . . . . . .612
Maximum number of traffic policies supported on a device . . . . .612
Setting the maximum number of traffic policies
supported on a Layer 3 device . . . . . . . . . . . . . . . . . . . . . . . . .613
ACL-based rate limiting using traffic policies. . . . . . . . . . . . . . . . . .613
Support for fixed rate limiting and adaptive rate limiting . . . .614
Configuring ACL-based fixed rate limiting. . . . . . . . . . . . . . . . .614
Configuring ACL-based adaptive rate limiting . . . . . . . . . . . . .615
Specifying the action to be taken for packets that are
over the limit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 617