Citrix SD-WAN

WAN Links

March 12, 2021

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Citrix SD-WAN platforms support upto 8 public internet connections and 32 Private MPLS connections. This article outlines WAN link configuration best practices for the Citrix SD-WAN solution.

Points to remember while configuring WAN links:

Configure the Permitted and Physical rate as the actual WAN link bandwidth. In cases where the entire WAN link capacity is not supposed to be used by the SD-WAN appliance, change the Permitted rate accordingly.
When you are unsure of the bandwidth and if the links are non-reliable, you can enable the Auto Learn feature. The Auto Learn feature learns the underlying link capacity only, and uses the same value in the future.
If the underlying link is not stable and does not guarantee fixed bandwidth (for example; 4G links), use the Adaptive Bandwidth Detection feature.
It is not recommended to enable Auto Learn and Adaptive Bandwidth Detection on the same WAN link.
Manually configure the MCN/RCN with the Ingress/Egress physical rate for all the WAN links since it is the central point of bandwidth distribution among multiple branches.
For increased reliability of important datacenter workloads/services, when auto-learn is not used, use reliable links with SLA’s that does not have random variation of capacity.
If the underlying link is not stable, change the following Path settings:
- Loss Settings
- Disable Instability Sensitive
- Silence time
Use Diagnostic tool to check the link health/capacity.
If SD-WAN is deployed in one-arm mode, ensure that you do not overrun the physical capacity of the underlying link.

Verifying ISP link Health

For new deployments, earlier than SD-WAN deployment and when adding new ISP link to the existing SD-WAN deployment:

Verify the link type. For example; MPLS, ADSL, 4G.
Network characteristics. For example - bandwidth, loss, latency, and jitter.

This information helps in configuring the SD-WAN network as per your requirements.

Network topology

It is commonly observed that specific network traffic bypasses the Citrix SD-WAN appliances, and uses the same underlying link configured in the SD-WAN network. Because SD-WAN does not have complete visibility over link utilization, there are chances that SD-WAN oversubscribes the link leading to performance and PATH issues.

Provisioning

Points to consider while provisioning SD-WAN:

By default, all branches and WAN services (Virtual Path/Internet/Intranet) receive equal share of the bandwidth.
Provisioning sites needs to be changed, when there is high disparity in terms of bandwidth requirement or availability between the connecting sites.
When dynamic virtual paths are enabled between maximum available sites, the WAN link capacity is shared between the static virtual path to DC and the dynamic virtual paths.

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WAN Links

March 12, 2021

Contributed by:

March 12, 2021

Contributed by:

WAN Links

Verifying ISP link Health

Network topology

Provisioning

In this article