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SLA Profiles and SD-WAN Policies Overview

Contrail Service Orchestration (CSO) enables you to add traffic-based steering profiles and map them to software-defined WAN (SD-WAN) policies for traffic management.

Traffic-Based Steering Profiles

Traffic-based steering profiles are created for applications or groups of applications for all tenants. Traffic-based steering profiles are categorized as follows:

. Table 120, Table 121 and Table 122 lists the categories of configurable constraints that are defined in an SLA-based profile, path-based profile and breakout profiles..

Table 120: SLA-Based Profile Categories

Category

Description

SLA profile parameters

You can define one or more than one of the following SLA profile parameters:

  • SLA Configuration—Whether to use recommended or custom values for the SLA threshold and SLA parameters.

  • SLA Threshold—Whether to use, liberal, baseline, or conservative settings for the threshold.

  • SLA parameters:

    • Packet loss—Percentage of data packets dropped by the network to manage congestion.

    • RTT—Target round-trip time (RTT) for the SLA profile.

    • Jitter—Difference between the maximum and minimum round-trip times (in ms) of a packet of data.

Path preference and failover

Paths are the WAN links to be used for the SLA profile. You can select MPLS, Internet, or any link as the preferred path. MPLS is more latency-sensitive than Internet.

You can trigger the path failover criteria when any of the SLA parameters is violated.or when all the SLA parameters are violated.

Class of service

Class of service (CoS) provides different levels of service assurances to various forms of traffic. CoS enables you to divide traffic into classes and offer an assured service level for each class. The classes of service listed in increasing order of priority and sensitivity to latency are best effort, voice, interactive video, streaming audio or video, control, and business essential. The default CoS is voice.

Rate limiters

Rate limiters are defined for traffic shaping and efficient bandwidth utilization. You can define the following rate limiters:

  • Maximum upstream and downstream rates—The maximum upstream and downstream rate for all applications associated with the SLA profile.

  • Maximum upstream and downstream burst sizes—The maximum size of a steady stream of traffic sent at average rates that exceed the upstream and downstream rate limits for short periods.

Table 121: Path-Based Profile Categories

Category

Description

Path preference

Paths are the WAN links to be used for the SLA profile. You can select an MPLS or Internet link as the preferred path. MPLS is more latency-sensitive than Internet.

Class of service

Class of service (CoS) provides different levels of service assurances to various forms of traffic. CoS enables you to divide traffic into classes and offer an assured service level for each class. The classes of service listed in increasing order of priority and sensitivity to latency are best effort, voice, interactive video, streaming audio or video, control, and business essential. The default CoS is voice.

Rate limiters

Rate limiters are defined for traffic shaping and efficient bandwidth utilization. You can define the following rate limiters:

  • Maximum upstream and downstream rates—The maximum upstream and downstream rate for all applications associated with the SLA profile.

  • Maximum upstream and downstream burst sizes—The maximum size of a steady stream of traffic sent at average rates that exceed the upstream and downstream rate limits for short periods.

Table 122: Breakout Profile Categories

Category

Description

Type

The type of breakout profile that you want to add:

  • Local Breakout (Underlay)—Select this option if you want traffic to break out locally (on the underlay) from the site.

  • Backhaul—Select this option if you want traffic to break out through a hub or a enterprise hub (if configured).

  • Local Breakout (Cloud)—Select to break out traffic through a cloud-based security platform. Currently, Zscaler is the only cloud-based security platform supported.

Traffic Type Profile

The traffic type profile to apply class of service parameters to the breakout traffic. You can select only a traffic type profile that is enabled.

Preferred Path

The preferred path (MPLS, Internet, or Any) to be used for breaking out the traffic.

If a WAN link type that matches the preferred path is enabled for breakout, then that WAN link type is used for breakout traffic.

If you specify that any path can be used, then there is no preference and all breakout-enabled links are used in a load-balancing mode.

Rate Limiting

Rate limiting of breakout traffic for cacheable applications. By default, rate limiting is disabled.

If you enable rate limiting, you must specify the upstream and downstream parameters, and the loss priority.

Upstream Rate

The maximum upstream rate (in Kbps) for all cacheable applications associated with the breakout profile.

Upstream Burst Size

The maximum size (in bytes) of a steady stream of traffic sent at average rates that exceed the upstream rate limit for short periods.

Downstream Rate

The maximum downstream rate (in Kbps) for all cacheable applications associated with the breakout profile.

Downstream Burst Size

The maximum size (in bytes) of a steady stream of traffic sent at average rates that exceed the downstream rate limit for short periods.

Loss Priority

Loss priority based on which packets are dropped or retained when network congestion occurs. Packet drops are most likely when the loss priority is High and least likely when the loss priority is Low.

SD-WAN Policies

Applications are classified into the following categories:

Policy intents consist of the following parameters:

SD-WAN supports advanced policy-based routing (APBR). APBR enables you to dynamically define the routing behavior of the SD-WAN network based on applications. Dynamic application-based routing makes it possible to define policies and to switch WAN links on the fly based on the application's defined SLA parameters. The APBR mechanism classifies sessions based on applications and application signatures and uses policy intents to identify the best possible route for the application. When the best possible route does not meet the application's defined SLA requirements, the SD-WAN network finds the next best possible route to meet SLA requirements.

For example, consider an application in a site. If you want the application group to use custom throughput, latency, or jitter, you can create an SLA profile with these custom values. You can then create an intent and configure the intent with the application and apply the custom SLA profile. When the intent is deployed, CSO determines the best suited WAN link to route traffic based in the application. If the WAN link fails to meet SLA requirements in runtime, the SD-WAN network switches WAN links to the next best suited path.

On the basis of the configured traffic-based steering profile constraints, you can categorize SD-WAN policies into three types:

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