Configuring CoS for Tunnels

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For Adaptive Services, Link Services, and Tunnel Physical Interface Cards (PICs) installed on T-series and M-series platforms with enhanced Flexible PIC Concentrators (FPCs), class-of-service (CoS) information is preserved inside generic routing encapsulation (GRE) and IP-IP tunnels.

For the ES PIC installed on T-series and M-series platforms with enhanced FPCs, class-of-service information is preserved inside IPSec tunnels. For IPSec tunnels, you do not need to configure CoS, because the ES PIC copies the type-of-service (ToS) byte from the inner IP header to the GRE or IP-IP header.

To configure CoS for tunnels, you can include the following statements at the [edit class-of-service] and [edit interfaces] hierarchy level of the configuration:



[edit class-of-service]

interfaces {



interface-name {



unit logical-unit-number {



rewrite-rules {

dscp (rewrite-name | default);

dscp-ipv6 (rewrite-name | default);

exp (rewrite-name | default) protocol protocol-types;

exp-push-push-push default;

exp-swap-push-push default;

ieee-802.1 (rewrite-name | default);

inet-precedence (rewrite-name | default);
}


}


}


}

rewrite-rules {


(dscp | dscp-ipv6 | exp | ieee-802.1 | inet-precedence) rewrite-name {

import (rewrite-name | default);



forwarding-class class-name {

loss-priority level code-point (alias | bits);
}


}


}
[edit interfaces]

gre-interface-name {
unit logical-unit-number;

copy-tos-to-outer-ip-header;
}

This chapter discusses the following topics:

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