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S12700 V200R010C00 Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring link aggregation, VLANs, Voice VLAN, VLAN mapping, QinQ, GVRP, MAC table, STP/RSTP/MSTP, SEP, and so on.
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Configuring MAC Address Flapping Detection to Quickly Detect Loops

Configuring MAC Address Flapping Detection to Quickly Detect Loops

When a loop occurs, MAC address flapping will occur at the failure point. You can use MAC address flapping detection to locate these loops.

When one of the following situations occurs, enable MAC address flapping detection to check whether a loop occurs:

  • A MAC address entry alternatively appears and disappears.
  • Ping operations alternatively succeed and fail.
  • A high CPU usage alarm is generated.

Table 2-4 compares loop detection technologies.

Table 2-4  Comparison of loop detection technologies

Feature

Advantages

Disadvantages

MAC address flapping detection

  • Checks all interfaces and VLANs on a switch.
  • Is easy to configure as it requires only one command. This function is enabled by default.

The switch can only report alarms after detecting a loop but cannot eliminate the loop.

Loop detection

  • Detects loops based on VLANs.
  • The switch can eliminate a loop after detecting the loop.

This function is not enabled by default and needs to be configured through commands.

Loopback detection

  • Detects loops based on interfaces and VLANs.
  • The switch can eliminate a loop after detecting the loop.

This function is not enabled by default and needs to be configured through commands.

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Updated: 2019-08-21

Document ID: EDOC1000142081

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