The Network Overview feature helps to monitor networks by checking the Edge and Link (activated Edge) status summary. Clicking Monitor > Network Overview in the navigation panel opens the Network Overview screen, which provides a visual summary about the enterprises running SD-WAN Edge devices, Non SD-WAN Destinations, profiles, segments, software versions, and their system configuration time and run time statuses.

The Network Overview screen presents the overall summary information about a network in three dashboard sections:
  • SD-WAN Edge statistics - Includes the following information about the Edges and Links:
    • Total number of Edges
    • Total number of Edge Hubs
    • Total number of Links
    • Total number of Hub Links
    • Count of Edges/Edge Hubs (Connected, Degraded, and Down)
    • Count of Link/Hub Links (Stable, Unstable, and Down)
  • Summary dashboard table - Includes a table that displays top ten Edges, or Edge Hubs, or Links, or Hub Links sorted by last contact time, based on the selected filter criteria in the SD-WAN Edge statistics section.
  • Non-Edge statistics - Includes the following non-edge related information:
    • Total number of Virtual Network Functions (VNFs)-enabled Edges
    • Count of VNFs-enabled Edges (Error, On, and Off)
    • Total number of VMware Active Standby Pair-enabled Edges
    • Count of VMware Active Standby Pair-enabled Edges (Failed, Pending, and Ready)
    • Total number of enabled Non SD-WAN Destinations
    • Count of Non SD-WAN Destinations (Connected and Offline)
    • Count of used Profiles out of the total number of Profiles configured for the Enterprise.
    • Count of activated Segments out of the total number of Segments configured for the Enterprise.
    • Count of Edges with up-to-date Software version out of the total number of Edges configured for the Enterprise.
      Note: The minimum supported edge version is 2.4.0. You can change the target edge version against which the edges will be compared by using the system property product.edge.version.minimumSupported.

You can also get detailed information on a specific item in the Network Overview screen by clicking the link on the respective item or metric. For example, clicking the Edge link in the summary dashboard table takes you to the Edge detail dashboard for the selected Edge.

You can configure the refresh time interval for the information displayed in the Network Overview dashboard screen to one of the following options:
  • pause
  • 30s
  • 60s
  • 5min

SD-WAN Edge States and Transitions

Transitions are driven by Edge heartbeats (which occur under normal circumstances every 30 seconds), irrespective of the Links over which the heartbeats are received.

The following table describes the connection state types and transitions for a SD-WAN Edge.

Color Edge State Description
Green Connected
  • An Edge is in Connected state if a heartbeat has been received from the Edge in the last 60 seconds.
  • The Edge transitions from Connected to Degraded state when the Orchestrator determines that a heartbeat has not been received from the Edge for more than 60 seconds.
  • The Edge transitions from Connected to Offline state when the Orchestrator has not received two consecutive heartbeats from the Edge within a span of two minutes (120 seconds).
Amber Degraded
  • An Edge is in Degraded state if the Edge to Orchestrator connectivity appears to be impacted, possibly due to transient network conditions.
  • The Edge transitions from Degraded to Offline state when the Orchestrator determines that a heartbeat has not been received from the Edge for more than two minutes (120 seconds).
Red Offline An Edge is in Offline state if the Edge is unable to reach the Orchestrator due to some persistent network condition.

SD-WAN Orchestrator Link States and Transitions

SD-WAN Orchestrator drives state changes between the various Link states based on the most recent state change, taking into consideration the time when the Link was last active and the time when the event last occurred. Transitions are driven by a combination of:
  • Edge-reported Link Stats values as received when the Edge pushes the Link Stats to the Orchestrator (occurs every 5 minutes).
  • Edge-reported Events as received by Edge heartbeats (occurs every 30 seconds).

The following table describes the connection state types and transitions for a SD-WAN Orchestrator Link.

Color Edge State Description
Green Stable A Link is in Stable state if the Link conditions appear to be stable and the Orchestrator receives the Link Stats consistently.
Amber Unstable A Link is in Unstable state if an expected Link Stats push is not received, or Link is down, but has not yet been inactive for 10 minutes.
Red Disconnected A Link is in Disconnected state if the Link has been inactive for more than 10 minutes.