Check EIGRP Neighbor State (Service Check)

See also Service Check

Basic Information

Service Check Category: Network Connectivity Checks

Passive: No

Description

This service check monitors the stability of EIGRP neighbor relationships on managed devices. It is designed to detect and report two critical state changes: when a peer briefly loses connection and when a peer disappears entirely. These events are essential indicators of routing instability, configuration changes, or potential outages in the EIGRP domain.

By implementing this check, network administrators gain visibility into transient and persistent disruptions in EIGRP adjacencies. The check supports proactive troubleshooting and helps maintain the integrity of routing tables across the network.

Monitoring Logic

The service check evaluates EIGRP peer states during each polling interval. It compares the current neighbor table with the previous state and analyzes peer uptime to determine if a bounce or disappearance has occurred.

Detected States

• Briefly Not Established - A peer is considered briefly not established if the EIGRP neighbor session was lost and re-established within 60 seconds. This typically indicates a momentary link failure or network congestion, identified by a drop in uptime compared to the previous poll. The peer is currently active, but the bounce indicates recent instability.
• Disappeared - If the EIGRP neighbor session was lost and not re-established within the 60-second threshold, it is classified as disappeared, which might suggest a configuration change or a more serious network issue. The peer is no longer present in the neighbor table. This might indicate that the peer was removed from the configuration or that a persistent failure has occurred.

If either of these states is returned by the device, the service check enters the CRITICAL state, generating an alarm.

Check-specific Configuration Fields

The following configuration fields are specific to this type of service check. See Service Check for configuration parameters common to all service checks.

• There are no fields specific to this service check.