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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R011C10

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 must have occurred on the failure point. You can use the MAC address flapping function to locate loops on a network. 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.

Compared to other loop detection technologies, MAC address flapping detection is easy to configure. Table 2-4 compares loop detection technologies.

Table 2-4  Comparison of loop detection technologies

Feature

Advantage

Disadvantage

MAC address flapping detection

  • Checks all interfaces and VLANs on a device.
  • Requires only one command and is enabled by default.

The device only reports alarms after detecting a loop but cannot eliminate the loop.

Loop detection

  • Detects loops based on VLANs.
  • The device 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 device 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: 2019-10-18

Document ID: EDOC1000178310

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