Link scheduler configuration task list
84
IPLink 3210 Series Getting Started Guide
7 • Link scheduler configuration
The type-of-service (TOS) byte in an IP header specifies precedence (priority) and type of service (RFC791,
RFC1349). The precedence field is defined by the first three bits and supports eight levels of priority. The next
four bits—which are set by the
set ip tos
command—determine the type-of-service (TOS).
Historically those bits had distinct meanings but since they were never consistently applied routers will ignore
them by default. Nevertheless you can configure your routers to handle specific TOS values and IPLink allows
you to inspect the TOS value in the ACL rules and to modify the TOS value with the link scheduler
set ip tos
command.
Mode:
Source
Specifying the precedence field
The
set ip precedence
command specifies the precedence marking applied to packets of the class name. Pre-
cedence and DSCP markings cannot be used at the same time.
The type-of-service (TOS) byte in an IP header specifies precedence (priority) and type of service (RFC791,
RFC1349). The precedence field is defined by the first three bits and supports eight levels of priority. The low-
est priority is assigned to 0 and the highest priority is 7.
The
no
form of this command disables precedence marking.
Mode:
Source
Specifying differentiated services codepoint (DSCP) marking
Differentiated services enhancements to the Internet protocol are intended to enable the handling of “traffic-
classes” throughout the Internet. In this context the IP header TOS field is interpreted as something like a
Table 12. TOS values and their meaning
TOS Value
IPLink Value
Meaning
1000
8
Minimize delay.
0100
4
Maximize throughput.
0010
2
Maximizes reliability.
0001
1
Minimize monetary costs.
0000
0
All bits are cleared, normal service, “default TOS”.
Command
Purpose
node(src)[
name
]#set ip tos
value Defines the type-of-service (TOS) value applied to packets of for the
selected class or policy
name. Standard ToT values are 0, 1, 2, 4,
and 8, as given in
table 12
on page 84, but any number from 0 to
15 can be configured.
Command
Purpose
node(src)[
name
]#set ip precedence
value
Defines the precedence marking value applied to pack-
ets of for the selected class or policy
name. The range
for
value is from 0 to 7, but only values from 0 to 5
should be used.
Содержание IPLink 3210 Series
Страница 4: ...Summary Table of Contents IPLink 3210 Series Getting Started Guide 4...
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Страница 18: ...About this guide IPLink 3210 Series Getting Started Guide 18...
Страница 90: ...90 Chapter 8 LEDs status and monitoring Chapter contents Status LEDs 91...
Страница 103: ...103 Appendix C Cabling Chapter contents Introduction 104 Serial console 104 Ethernet 10Base T and 100Base T 105...
Страница 110: ...110 Appendix E IPLink 3210 Series factory configuration Chapter contents Introduction 111...
Страница 112: ...112 Appendix F Installation checklist Chapter contents Introduction 113...