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Class of Service

  • Support for policy maps (PTX10002-36QDD)—Use policy maps on PTX10002-36QDD routers to assign rewrite rules on a per-customer basis. You can use any packet field to identify a given flow and specify a rewrite value for that flow. PTX10002-36QDD routers support the following types of packet marking: INET-Precedence, DSCP, IEEE 802.1p, and IEEE 802.1ad..

    You can define a policy map by including the policy-map statement at the [edit class-of-service] hierarchy level. You enable policy-map-marking at the egress interface at the [edit class-of-service interfaces interface-name unit unit-number] hierarchy level.

    On PTX10002-36QDD routers, you can also use policy maps to pass meta data between firewall filters. That is, a policy map value set in an ingress filter can be matched on in an egress filter.

    [See Assigning Rewrite Rules on a Per-Customer Basis Using Policy Maps.]

  • Support for ECN copy on EVPN-VXLAN tunnels (PTX10002-36QDD) —PTX10002-36QDD routers that originate or terminate EVPN-VXLAN tunnels and have explicit congestion notification (ECN) enabled automatically copy the ECN bits from the inner header to the outer header. The router copies the ECN bits from the outer header to the inner header if the inner header has the ECT bit set. If the router experiences congestion, it sets the CE bits if the ECT bit is enabled.

    [See CoS Support on EVPN VXLANs.]

  • Support for low-threshold ECN (PTX10001-36MR, PTX10004, PTX10008, and PTX10016) —You can define a buffer rate, whichis the base rate for buffer size calculation. The buffer rate is the target rate of a virtual output queue (VOQ), which is the intended egress queue rate during typical congestion.

    Configure the buffer-rate statement at the [edit class-of-service schedulers scheduler-name] hierarchy level.

    You can also define more granular fill-level percentages for drop profiles. That is, you can now set fill-level percentages to tenths of a percent instead of just whole percentages (for example, 50.2 percent versus just 50 percent).

    Define drop profiles at the [edit class-of-service drop-profiles profile-name] hierarchy level.

    Setting the buffer rate and defining more granular drop profiles can improve the buffer resolution on lower-end buffers, which helps implement low-threshold explicit congestion notification (ECN). (Low-threshold ECN triggers ECN marking as soon as the buffer starts filling up).

    [See CoS Explicit Congestion Notification.]

  • Support for shared VOQ queue-depth monitor profiles across ae- interfaces (PTX10001-36MR, PTX10004, PTX10008, and PTX10016) —By default, a monitoring profile that you assign to an aggregated Ethernet (ae-) interface replicates across all members of the ae- interface. The monitoring profile also reports virtual output queue (VOQ) depth individually on each interface. On large systems, this process can quickly consume the maximum supported hardware monitoring profile IDs. To conserve monitoring profile IDs, include the shared option at the [set class-of-service interfaces ae-interface monitoring-profile profile-name] hierarchy level. The configured shared option creates only one monitoring profile ID to share across all member interfaces. The option also reports the largest peak on a member interface as the common peak for the ae- interface.

    [See VOQ Queue-depth Monitoring.]