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MX-series CoS Hardware Capabilities and Limitations

Generally, the Layer 3 CoS hardware capabilities and limitations are the same as the M-series, especially the M120. In particular, the following scaling and performance parameters apply to MX-series routers:

Eight classifiers
Eight rewrite tables
Eight queues per port
32 WRED profiles
100-ms queue buffering
Line rate CoS features

On the MX-series routers, you can apply classifiers or rewrite rules to an integrated bridging and routing (IRB) interface at the [edit class-of-service interfaces irb unit logical-unit-number] level of the hierarchy. All types of classifiers and rewrite rules are allowed. These classifiers and rewrite rules are independent of others configured on the MX-series router.



[edit class-of-service interfaces]

irb {



unit logical-unit-number {



classifiers {

type (classifier-name | default);
}





rewrite-rules {

dscp (rewrite-name | default);

dscp-ipv6 (rewrite-name | default);

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

ieee-802.1 (rewrite-name | default) vlan-tag (outer | outer-and-inner);

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


}


}

The IRB classifiers and rewrite rules are applied only to the “routed” packets. For logical interfaces that are part of a bridge domain, only IEEE classifiers and IEEE rewrite rules are allowed. Only the listed options are available for rewrite rules on an IRB.

For dual-tagged bridge domain logical interfaces, you can configure classification based on the inner or outer VLAN tag's IEEE 802.1p bits using the vlan-tag statement with the inner or outer option:



[edit class-of-service interfaces interface-name unit logical-unit-number]
classifiers {
ieee-802.1 (classifier-name | default)
vlan-tag (inner | outer);
}

Also, for dual-tagged bridge domain logical interfaces, you can configure rewrite rules to rewrite the outer or both outer and inner VLAN tag's IEEE 802.1p bits using the vlan-tag statement with the outer or outer-and-inner option:



[edit class-of-service interfaces interface-name unit logical-unit-number]
rewrite-rules {
ieee-802.1 (rewrite-rule-name | default)
vlan-tag (outer | outer-and-inner);
}

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