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Example: Configuring CoS with DSCP IPv6 Rewrite Rules
This example shows how to associate an interface with a default or user-defined DSCP IPv6 rewrite rule. Typically, you use rewrite rules to alter CoS values in outgoing packets to meet the requirements of the targeted peer.
Requirements
Before you begin, configure the ge-0/0/0 interface on the device for IPv6 and define your user-defined DSCP IPv6 rewrite rules.
Overview
In this example, you configure CoS and create a user-defined rewrite rule called rewrite-ipv6-dscps. You then specify rewrite rules for the best-effort forwarding class as be-class, the expedited forwarding class as ef-class, the assured forwarding class as af-class, and the network control forwarding class as nc-class. Finally, you associate interface ge-0/0/0 with the user-defined rule.
Configuration
Procedure
CLI Quick Configuration
To quickly configure this example, copy the
following commands, paste them into a text file, remove any line breaks,
change any details necessary to match your network configuration,
copy and paste the commands into the CLI at the [edit] hierarchy
level, and then enter commit from configuration mode.
set class-of-service rewrite-rules dscp-ipv6 rewrite-ipv6-dscps set class-of-service rewrite-rules dscp-ipv6 rewrite-ipv6-dscps forwarding-class be-class loss-priority low code-point 000000 set class-of-service rewrite-rules dscp-ipv6 rewrite-ipv6-dscps forwarding-class be-class loss-priority high code-point 000001 set class-of-service rewrite-rules dscp-ipv6 rewrite-ipv6-dscps forwarding-class ef-class loss-priority low code-point 101110 set class-of-service rewrite-rules dscp-ipv6 rewrite-ipv6-dscps forwarding-class ef-class loss-priority high code-point 101111 set class-of-service rewrite-rules dscp-ipv6 rewrite-ipv6-dscps forwarding-class af-class loss-priority low code-point 001010 set class-of-service rewrite-rules dscp-ipv6 rewrite-ipv6-dscps forwarding-class af-class loss-priority high code-point 001100 set class-of-service rewrite-rules dscp-ipv6 rewrite-ipv6-dscps forwarding-class nc-class loss-priority low code-point 110000 set class-of-service rewrite-rules dscp-ipv6 rewrite-ipv6-dscps forwarding-class nc-class loss-priority high code-point 110001 set class-of-service interfaces ge-0/0/0 unit 0 rewrite-rules dscp-ipv6 rewrite-ipv6-dscps
Step-by-Step Procedure
The following example requires you to navigate various levels in the configuration hierarchy. For instructions on how to do that, see Using the CLI Editor in Configuration Mode in the Junos OS CLI User Guide.
To configure a CoS with a user-defined DSCP IPv6 rewrite rule:
Configure CoS.
[edit] user@host# edit class-of-service
Create a user-defined rewrite rule.
[edit class-of-service] user@host# edit rewrite-rules dscp-ipv6 rewrite-ipv6-dscps
Specify rewrite rules for the best-effort forwarding class.
[edit class-of-service rewrite-rules dscp-ipv6 rewrite-ipv6-dscps] user@host# set forwarding-class be-class loss-priority low code-point 000000 user@host# set forwarding-class be-class loss-priority high code-point 000001
Specify rewrite rules for the expedited-forwarding forwarding class.
[edit class-of-service rewrite-rules dscp-ipv6 rewrite-ipv6-dscps] user@host# set forwarding-class ef-class loss-priority low code-point 101110 user@host# set forwarding-class ef-class loss-priority high code-point 101111
Specify rewrite rules for the assured-forwarding forwarding class.
[edit class-of-service rewrite-rules dscp-ipv6 rewrite-ipv6-dscps] user@host# set forwarding-class af-class loss-priority low code-point 001010 user@host# set forwarding-class af-class loss-priority high code-point 001100
Specify rewrite rules for the network-control forwarding class.
[edit class-of-service rewrite-rules dscp-ipv6 rewrite-ipv6-dscps] user@host# set forwarding-class nc-class loss-priority low code-point 110000 user@host# set forwarding-class nc-class loss-priority high code-point 110001
Associate an interface with a user-defined rule.
[edit class-of-service] user@host# set interfaces ge-0/0/0 unit 0 rewrite-rules dscp-ipv6 rewrite-ipv6-dscps
Results
From configuration mode, confirm your configuration by entering the show class-of-service command. If the output does not display the intended configuration, repeat the configuration instructions in this example to correct it.
[edit]
user@host# show class-of-service
interfaces {
ge-0/0/0 {
unit 0 {
rewrite-rules {
dscp-ipv6 rewrite-ipv6-dscps;
}
}
}
}
rewrite-rules {
dscp-ipv6 rewrite-ipv6-dscps {
forwarding-class be-class {
loss-priority low code-point 000000;
loss-priority high code-point 000001;
}
forwarding-class ef-class {
loss-priority low code-point 101110;
loss-priority high code-point 101111;
}
forwarding-class af-class {
loss-priority low code-point 001010;
loss-priority high code-point 001100;
}
forwarding-class nc-class {
loss-priority low code-point 110000;
loss-priority high code-point 110001;
}
}
}
If you are done configuring the device, enter commit from configuration mode.