Adding SLA-Based Steering Profiles

General

Name

Enter a unique string that can contain alphanumeric characters and hyphens (-); the maximum length is 15 characters.

Traffic Type Profile

Choose a traffic type profile to apply the class-of-service configuration and priority to the SLA profile. You can select a traffic type profile only when it is in the Enabled state.

SLA Configuration

Choose one of the following options:

• Use Recommended: To use the default SLA threshold and SLA parameters for the SLA-based steering profile.

• Enter Custom: To specify customized values for SLA configuration and SLA parameters for the SLA-based steering profiles.

SLA Threshold

Choose one of the following options:

• Liberal—To use a relaxed SLA threshold.

• Baseline—To use the default SLA threshold.

• Conservative—To use a strict SLA threshold.

SLA Parameters

Packet Loss

Enter the target packet loss (in %) for the SLA-based steering profile. Packet loss is the percentage of data packets dropped by the network to manage congestion.

RTT

Enter the target round-trip time (RTT) for the SLA-based steering profile.

Jitter

Enter the target jitter (in ms) for the SLA-based steering profile. Jitter is the difference between the maximum and minimum round-trip times of a packet of data.

Path Selection Criteria

Path Preference

Select the preferred WAN link type (MPLS, Internet, or Any) to associate with the SLA profile. Any is the default value.

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

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

Strict Affinity

This field is displayed only if you select MPLS or Internet as the path preference.

Enable the toggle button to use strict link affinity.

For strict link affinity, AppQoE ensures that the path selected is always of the preferred link type. If the preferred link does not meet the SLA, then the traffic remains on the preferred link with the status as SLA not met. If multiple links of the preferred link type are available, then the traffic selects the link that has the highest priority and meets the SLA.

If the link affinity is not strict and if SLA meeting links belonging to the preferred link type are not available, then AppQoE selects a link outside the preferred link type that meets the SLA requirements. If multiple links meeting the SLA are available, then the traffic switches over to the link with the highest priority. If the traffic switches over to a non-preferred link type, then the traffic automatically reverts to the preferred link when the preferred link recovers and conforms to the SLA.

Path Failover Criteria

Specify the failover criteria to determine how links are switched when the active links fail to meet the SLA criteria. In such cases, the traffic is routed to links that meet SLA criteria.

Choose one of the following options:

• Does not meet one or more SLA parameters—This triggers the path failover if any of the SLA parameters is violated.

• Does not meet all SLA parameters—This triggers the path failover only when all the SLA parameters are violated.

Advanced Configuration-

Maximum Upstream Rate

Enter the maximum upstream rate (in Kbps) for all applications associated with the SLA profile.

Range: 64 through 10,485,760 Kbps

Maximum Upstream Burst Size

Enter the maximum upstream burst size (in bytes).

Range: 1 through 1,342,177,280 bytes

Maximum Downstream Rate

Enter the maximum downstream rate (in Kbps) for all applications associated with the SLA profile.

Range: 64 through 10,485,760 Kbps

Maximum Downstream Burst Size

Enter the maximum downstream burst size (in bytes).

Range: 1 through 1,342,177,280

Loss Priority

Select a loss priority based on which packets can be dropped or retained when network congestion occurs. The chances of a packet getting dropped is the highest when the loss priority is set to High. Other available values are Medium High, Medium Low, and Low.

Real Time Optimized Mode Setting

Session-sampling %

Enter the matching percentage of sessions for which you want to run the passive probes.

SLA-violation-count

Enter the number of SLA violations after which you want CSO to switch paths. The range is 1 through 32.

Sampling-period

Enter the sampling period, in seconds, for which the SLA violations are counted. The range is 2 through 60.

Switch-cool-off-period

Enter the waiting period, in seconds, only after which you want the link switch to happen if an active link comes back online. This parameter helps prevent frequent switching of traffic between active and backup links. The range is 5 through 300.