Citrix SD-WAN creates a reliable WAN from diverse network links, including MPLS, broadband, and wireless, continuously measuring and monitoring each link for loss, latency, jitter and congestion. Link outages and errors are mitigated by NetScaler SD-WAN’s ability to move traffic off poor performing links without impact to the applications, resulting in predictable and consistent performance. Mission critical applications are always routed across the paths with the fastest transit time, real-time application traffic can be duplicated to guarantee no loss and traffic from high bandwidth applications can be balanced across multiple links to provide high performance for large file transfers.

Complete the following steps to monitor the SD-WAN WAN links and virtual paths:

1. Log into the Master Control Node or the remote SD-WAN appliance.

2. Go to Monitoring > Statistics > In the Scroll Menu select: Paths (Details).

3. Enable the auto refresh option.

   

• Congestion: detected on a WAN Link is due to increased, unexpected delay in packet flow in the WAN

• Path State: It could be GOOD, BAD or DEAD. The paths will be marked BAD due to loss, and will incur a path scoring penalty. When path is DEAD is because there is not connection with the other end.

• Reason: In this field you can find the reason why a path is marked BAD or DEAD. The reason could be:

  • PEER: It means the remote site detected path state changed to BAD or DEAD

  • SILENCE: It means no packets received

  • LOSS: It means some missing packets detected

• Duration:There are the seconds pf the path in the current state

• Virtual Path Service State: It could be GOOD, BAD or DEAD. The Virtual Path requieres at least 1 Path up to keep as GOOD.

• Source and Destination Port: It is the port configured to stablish the virtual path between 2 SD-WAN

• MTU:It is the discovered MTU valid for a specific path in a LAN to WAN direccion only.

• BOWT:It meas the Latency Best One Way Time

• Jitter:It is the statustically calculated Jitter. Jitter is defined as a variation in the delay of received packets. At the sending side, packets are sent in a continuous stream with the packets spaced evenly apart. Due to network congestion, improper queuing, or configuration errors, this steady stream can become lumpy, or the delay between each packet can vary instead of remaining constant.

• OOO:It means Packets out of order.

• Packet Lost:It means the porcentage of packet loss

• kbps:It means the total bandwidth consumed by all packet types.

• Virtual Path Service Type:It confirms if the WAN Link path is part of a Static or Dynamic Virtual path

In this article we focused on the SD-WAN appliances monitoring tab, but if you would like to review the SD-WAN Center Reports, refer to the following Citrix Documentation - How to View Link Performance Statistics in SD-WAN Center