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Monitoring > Bandwidth > Overlays & Interfaces > Overlay-Interface-Transport

The Overlay-Interface-Transport tab provides the distribution of traffic across three dimensions (overlays, interfaces, and transport), which you can view individually or compared to another dimension by selecting two of the three dimensions. You can display the data in three ways: pie charts, line graphs, or summary.

For example, select the Overlay and Interface options to see how the overlay traffic is distributed for your interfaces. You can use the Flip button as a toggle to switch (flip) the display of the inner- and outer-ring data.


You can also see how much traffic is transported from one EdgeConnect appliance to another on the SD WAN fabric (Overlays) compared to how much is broken out (local breakout or to the internet). The Underlay legend displays non-overlay traffic.


The types of transport traffic are:

  • Underlay – Includes traffic that traverses directly over SD-WAN underlay tunnels (excluding BIO overlay traffic, which also uses these tunnels). For example, if you create a rule with match criterion application x, and then send it over to New_York_MPLS_MPLS (an underlay tunnel), the traffic is categorized as underlay traffic. In addition, underlay traffic includes data sent over actual SD-WAN underlay tunnels, generally including the following types of control messages:

    • Keep alive packets – Appliances use these packets to evaluate the reachability of remote peers and the health of connections.

    • Path characterization (pathchar) – Measures path characteristics (loss, latency, and jitter) for a specific path or tunnel.

  • Services – Includes two types of traffic:

    • Any non-BIO traffic sent to non-SD-WAN locations over an encapsulated tunnel (that is, IPSec or GRE), such as Zscaler.

    • Any encapsulated traffic that matches a BIO match criterion sent to a cloud service.

  • Passthrough – Includes any non-BIO traffic sent without any encapsulation to a destination.

  • SP Overlay – Includes any traffic sent to SD-WAN peers over BIO-bonded tunnels.

  • Breakout (local breakout or to the internet) – Includes any non-encapsulated traffic that matches a BIO match criterion sent to non-SD-WAN peers.

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