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S12700 V200R013C00 Log Reference

This document provides the explanations, causes, and recommended actions of logs on the product.
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
ADPIPV4

ADPIPV4

ADPIPV4/4/CPCAR_TTL1_DROP

Message

ADPIPV4/4/CPCAR_TTL1_DROP: The number of packets sent to the CPU exceed the threshold [ULONG]. (Slot=[STRING], CPCARType=[STRING], DiscardPacketCount=[STRING], Reason="[STRING]")

Description

The device receives a large number of TTL-expired packets, which are then discarded because the packet rate exceeds CPCAR settings.

Parameters

Parameter Name Parameter Meaning
Slot Indicates the slot ID.
CPCARType Indicates the CPCAR type.
  • CPCAR_TTL1: TTL-expired packets will be discarded.
DiscardPacketCount Indicates the number of discarded packets.
Reason Indicates the reasons for packet discarding.
  • A routing loop may occur: A routing loop may occur on the network. As a result, a large number of TTL-expired packets are received by the device and then discarded because the packet rate exceeds CPCAR settings.

Possible Causes

Cause 1: A routing loop occurs on the network.

Cause 2: The device is attacked by TTL-expired packets.

Procedure

  1. Run the display cpu-defend statistics command in the user view multiple times to check whether the number of discarded TTL-expired packets continuously increases.

    • If the number of discarded TTL-expired packets does not continuously increase and current services are normal, no action is required.
    • If the number of discarded TTL-expired packets continuously increases, go to step 2.

  2. Check whether a routing loop occurs on the network. If so, eliminate the loop.
  3. Check whether the device is under an TTL-expired packet attack. If so, you are advised to configure the CPU attack defense policy to reduce the number of TTL-expired packets sent to the CPU and identify the attack source based on the source address and port information of attack packets.
  4. If the alarm persists after the routing loop and attack packets are removed, collect log information and configuration information, and then contact technical support personnel.You can collect diagnostic information using the display diagnostic-information command.
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Updated: 2019-04-09

Document ID: EDOC1100065665

Views: 5421

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