GTPC Path Failure Detection

Path failure is detected in the following conditions:

  • Echo Failure: Echo failure occurs when the peer doesn't respond to the Echo Request or the retries.

  • Restart Counter in Echo Response or Control Messages: The GTPC entity receives Recovery IE either in an Echo Response or from the peer GTPC message. GTPC entity compares the received the restart counter value with the previously stored restart counter value for that peer entity and performs the following:

    • Stores the received restart counter value for the peer when previously stored value isn't available.

    • When the max-remote-rc-change parameter is not configured, GTPC detects the change in the restart counter.

    • When max-remote-rc-change is configured, calculate the difference in the restart counter value considering restart counter rollover. Detects path failure when the difference between new and old restart counter is less than the value of max-remote-rc-change.

    Note

    For more information on max-remote-rc-change, refer to Customization of Path Failure Detection.