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CoS Features and Limitations on MX Series Routers

Generally, the Layer 3 CoS hardware capabilities and limitations for Juniper Networks MX Series 5G Universal Routing Platforms are the same as for M Series Multiservice Edge Routers (M120 routers in particular).

In particular, the following scaling and performance parameters apply to MX Series routers:

  • 48* classifiers of each type, when subscriber management is enabled

  • 32 rewrite tables of each type, when subscriber management is enabled

  • Eight queues per port

  • 64 WRED profiles

  • 100-ms queue buffering for interfaces 1 Gbps and above; 500 ms for all others

  • Line-rate CoS features

Note:

*Starting with Junos OS Release 16.1R5, Junos OS Release 17.1R3, Junos OS Release 17.2R2, and Junos OS Release 17.3R2, you can configure up to 48 classifiers per family at the [edit class-of-service classifiers] hierarchy level when subscriber management is enabled. In earlier releases, you could only configure up to 32 classifiers per family.

For more information about MX Series router CoS capabilities, including software configuration, see Configuring Hierarchical Schedulers for CoS and Enhanced Queuing DPC CoS Properties.

For Juniper Networks MX Series 5G Universal Routing Platforms, the following restrictions apply:

  • You can only use multifield classifiers (but not BA classifiers) for IPv4 DSCP bits for virtual private LAN service (VPLS).

  • You cannot use BA classifiers for IPv4 DSCP bits for Layer 2 VPNs.

  • You cannot use BA classifiers for IPv6 DSCP bits for VPLS.

  • You cannot use BA classifiers for IPv6 DSCP bits for Layer 2 VPNs.

On 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 an MX Series router.

For IQ PICs, you can only configure one IEEE 802.1 rewrite rule on a physical port. All logical ports (units) on that physical port should apply the same IEEE 802.1 rewrite rule.

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:

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:

Release History Table
Release
Description
16.1R5
Starting with Junos OS Release 16.1R5, Junos OS Release 17.1R3, Junos OS Release 17.2R2, and Junos OS Release 17.3R2, you can configure up to 48 classifiers per family at the [edit class-of-service classifiers] hierarchy level when subscriber management is enabled.