Operating Instructions 18/1543-AXM 101 04/1 Uen C

MRF Next Hop Router Unreachable
Virtual Multimedia Resource Function

Contents


1 Overview

This instruction concerns alarm handling.

1.1 MRF Next Hop Router Unreachable Alarm Description

This alarm is a primary alarm. The alarm is issued by the MrfMediaInterface MO. The severity of the alarm is Major.

The alarm is issued when connection from VM to next hop router is lost, that is, if a vMRF VM does not receive ARP reply (IPv4) or neighbor advertisement message (IPv6) from the next hop router before the response timer expires.

The next hop client in the vMRF VM continuously monitors the next router availability, and the alarm is ceased when the VM gets a valid ARP response (IPv4) or neighbor advertisement message (IPv6) from the next hop router.

The following are the consequences for the VM if the alarm is not solved:

  • No user plane traffic is possible on the media interface.

The possible alarm causes and fault locations are explained in Table 1.
Table 1   Alarm Causes

Alarm Cause

Description

Fault Reason

Fault Location

Impact

Next hop router is not responding

Connectivity failure between next hop router and client

Next hop router down or

Faulty DHCP configuration or

HW fault

Next hop router or

Network or

Cloud environment

No user plane traffic is possible on the media interface.
The alarm attributes are listed and explained in Table 2.
Table 2   Alarm Attributes

Attribute Name

Attribute Value

Major Type

193

Minor Type

5308431

Managed Object Class

MrfMediaInterface

Managed Object Instance

ManagedElement=1,MediaResourceFunction=1,MrfResource=1, MrfInstance=<MrfInstanceId>,MrfMediaInterface=<MrfMediaInterfaceId>

Specific Problem

MRF Next Hop Unreachable

Event Type

communicationsAlarms (2)

Probable Cause

CommunicationsProtocolError (305)

Additional Text

Next hop router <IP address> is unreachable; uuid:<uuid>(1)

Perceived Severity

major (4)
(1) <uuid> is the identity of the Virtual Machine from which the alarm is issued.

2 Cease the MRF Next Hop Router Unreachable Alarm

The following procedure describes how to cease an MRF Next Hop Router Unreachable alarm.

  1. Check from the cloud environment or from external next hop router, in case it is used, if next hop router is enabled for the instance. If the router is disabled, enable it.
  2. Check the next hop router configuration.
  3. Check the DHCP server configuration.
  4. Check firewall settings, one option is that ICMP messages are blocked by firewall.
  5. Check if the MRF Next Hop Router Unreachable alarm is still active.

    • If the alarm is active only in a few VMs, lock and restart the affected VMs.

    • If the alarm is active in all VMs, restart the next hop router in the cloud environment.

    • If the alarm has ceased, continue to Perform Concluding Routines.

  6. If the alarm remains, consult the next level of maintenance support. Further actions are outside the scope of this instruction. Continue to Perform Concluding Routines.
Results:

3 Perform Concluding Routines

Steps

  1. Make a report.
  2. The job is completed.
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