Supported Device and Health
Statistics
You can view real-time device and health
statistics in device-specific dashboards and in custom dashboards.
For more information about the services discussed in this topic, see Visibility Manager Microservices.
Device statistics
The Statistics Collection Service (SCS) processes the statistics that are displayed in
dashboards. Statistics are obtained from supported devices in the following ways.
- Extreme 9920
devices: When a 9920 device is
discovered, Visibility Manager uses gNMI to
subscribe to the required statistic types. The collected statistics are
processed and displayed in dashboards.
- SLX devices: When an
SLX device is discovered, Visibility Manager is
configured as a telemetry collector for streaming statistics. Streamed
statistics are processed and displayed in dashboards.
- MLX devices: Visibility Manager runs CLI commands
periodically to collect statistics, which are processed and displayed in
dashboards.
Table 1. Supported statistics by device type
Statistic |
9920 |
SLX |
MLX |
Ingress group |
Yes |
No |
No |
Interface |
Yes |
Yes |
Yes |
Egress policy |
Yes |
No |
No |
Ingress policy |
Yes |
Yes |
Yes |
System |
Yes |
Yes |
Yes |
Interface summary |
Yes |
Yes |
Yes |
Device health management
The Device Health Monitoring Service (DHMS) runs on the region nodes and controls health
management information. It manages device health and informs the other microservices
about a device‘s state. Based on this information, the other microservices update
their internal states and respond accordingly. The DHMS also manages syslog and
event streams from a device.
- Syslog: A device
generates logs from different components running on the system. These logs
are consumed by the syslog client on the device. Visibility Manager enables
syslog configuration when a device is discovered. The Device Receive Service
(DRS) hosts the syslog server and streams the syslog messages to the DHMS
and Visibility Manager, where the messages are displayed.
- Events: Events for
Extreme 9920 devices
are supported by gNMI subscriptions to the paths of interest. The following
events are supported: device state, chassis state, port status, and
port-channel status. Events are displayed per device in the dashboards.
Note
Because SLX and MLX
devices do not support gNMI, this functionality is not supported on
those devices.
- Device availability:
Visibility Manager periodically checks for
device availability. When a failure occurs or an offline device comes back
online, Visibility Manager generates an event
and forwards it to internal services. The change in the device state is
reflected in the Notification area of the user interface.