7
Configuring Traffic Management
414
Voyager Reference Guide
Configuring Queue Classes
Queue Class Description
Queue classes (QCs) are used to instantiate a framework, or template, for
output queue schedulers. Like Access Control Lists (ACLs) they are created
and configured and then associated with an interface.
There are a maximum of 8 priority-level queues for a QC. You can configure
the size (in packets) of each queue level as well as the queue specifier. The
queue specifier is a tag assigned by the classifier and is used as a key to look
up the proper queue level. Three queue levels are pre-defined: the
Internetwork Control (IC), Expedited Forwarding (EF), and Best Effort (BE)
queues. The remaining queues can be assigned any name and QueueSpec you
want. The table below shows the values that correspond to these queue values:
When you configure an ACL rule to use the priority action, you must
configure an Aggregation Class (AGC). This AGC will function as a policer,
that is, non-conforming traffic will be dropped. You should configure the
AGCs so that the aggregate of the NC and EF flows consumes no more than
50% of the output link bandwidth. This action prevents lower-priority traffic
from being starved. See RFC 2598 for more information. The other policers
should also be configured to prevent the lower-priority queue from being
starved.
Name of Queue
Level
Priority
IETF DiffServ
Codepoint
Queue Specifier
Value
Internetwork
Control
0
0xc0
7
Expedited
Forwarding
1
0xb8
6
Best Effort
7
0
0
Summary of Contents for Network Voyager
Page 1: ...Voyager Reference Guide Part No N450820002 Rev A Published December 2003 ...
Page 4: ...4 Voyager Reference Guide ...
Page 30: ...2 How to Use Voyager 30 Voyager Reference Guide ...
Page 32: ...3 Command Line Utility Files 32 Voyager Reference Guide ...
Page 220: ...5 Configuring Interfaces 220 Voyager Reference Guide ...
Page 446: ...7 Configuring Traffic Management 448 Voyager Reference Guide ...
Page 618: ...10 Configuring Security and Access 620 Voyager Reference Guide ...
Page 668: ...14 Configuring IPv6 670 Voyager Reference Guide ...
Page 672: ...15 IPSO Process Management 674 Voyager Reference Guide ...
Page 700: ...Index 702 Voyager Reference Guide ...