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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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SUBNET_RT_CONFLICT

SUBNET_RT_CONFLICT

Description

The SUBNET_RT_CONFLICT alarm indicates that subnets conflict on a data communication network (DCN). This alarm is reported when the subnet in which an NE resides and the subnet in which a neighboring NE resides overlap.

Attribute

Alarm Severity Alarm Type

Minor

Communication alarm

Parameters

Name Meaning

Parameter 1 to Parameter 4

Indicates the address of the conflicting subnet.

NOTE:

When the local subnet conflicts with multiple subnets, Parameter 1 to Parameter 4 indicate the subnet address with the longest mask.

Parameter 5

Indicates the mask length of the conflicting subnet.

NOTE:

When the local subnet conflicts with multiple subnets, Parameter 5 indicates the length of the longest subnet mask.

Impact on the System

When an NE reports this alarm, the NE cannot be managed through its Ethernet port, and even the PC connected to the NE fails to receive packets from the NE.

Possible Causes

The possible cause of the SUBNET_RT_CONFLICT alarm is as follows:

Cause: An NE (NE A) uses the longest prefix match rule to forward packets to a PC. If the subnet address that NE A has learned from another NE (NE B) conflicts with the address of the subnet in which NE A resides, and NE B has a longer subnet mask than NE A, NE A will forward the packets to NE B, instead of the PC.
Figure 4-32  Networking diagram

Figure 4-32 shows a DCN, where NE1 is the gateway NE and connected to the NMS through a router, and NE2 and NE4 are non-gateway NEs. The subnet addresses and masks of these NEs are as follows:

  • NE1: 10.12.0.1/24
  • NE2: 10.12.0.12/16, PC A: 10.12.0.13/16
  • NE3: 10.12.0.10/24, PC B: 10.12.0.9/24
  • NE4: 10.12.0.11/24

When attempting to send packets to PC A based on the addressing protocol (longest prefix match rule), NE2 will identify NE1 as the destination, instead of PC A. As a result, PC A fails to receive the packets from NE2.

Procedure

  1. Cause: An NE (NE A) uses the longest prefix match rule to forward packets to a PC. If the subnet address that NE A has learned from another NE (NE B) conflicts with the address of the subnet in which NE A resides, and NE B has a longer subnet mask than NE A, NE A will forward the packets to NE B, instead of the PC.
    1. View Parameter 1 to Parameter 4 to determine the conflicting subnet address.
    2. Locate the NE according to the conflicting address and Parameter 5.
    3. Re-configure the subnet mask of the NE to ensure that all NEs on the DCN have the same subnet mask. It is recommended that the subnet mask of the affected NE be set consistently with that of gateway NE.

      • Do not modify the subnet mask of the gateway NE, because the gateway NE may be unreachable to the NMS after such a modification.
      • If the subnet addresses of multiple NEs conflict, it is recommended that the subnet mask of the NE farthest away from the gateway NE be modified first. If you modify an NE nearer to the gateway NE, the NE may be unreachable to the NMS after the modification.
      • When you modify subnet masks, new SUBNET_RT_CONFLICT alarms may be reported. Handle the alarms according to the specific networking scenario.

Related Information

None.

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Updated: 2019-01-21

Document ID: EDOC1100020975

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