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Configuration Guide - Ethernet Switching

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, MUX VLAN, Voice VLAN, VLAN mapping, QinQ, GVRP, VCMP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, and Layer 2 protocol transparent transmission.
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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).
M-LAG Consistency Check

M-LAG Consistency Check

The M-LAG is a dual-active system composed of two devices. It is a horizontal virtualization technology that virtualizes two devices into one device (a Layer 2 logical node). The logical topology is clear, and some configurations of two devices in the M-LAG must be consistent. If some configurations of two devices in the M-LAG are inconsistent, the M-LAG may fail to work or a loop may occur.

When the M-LAG is applied to an enterprise data center network, if the configuration of two devices in the M-LAG is manually performed or compared, the efficiency is low and there are many potential risks of incorrect configurations.

To address the preceding issues, Huawei proposes M-LAG consistency check. The M-LAG mechanism provides the configuration consistency check to request the configuration of each module. Based on the comparison result after M-LAG consistency check is enabled, you can adjust the configurations of devices in the M-LAG to prevent problems such as network loops or data loss.

The M-LAG configuration falls into two types: key configuration (Type 1) and common configuration (Type 2), as described in Table 4-2. Two M-LAG consistency check modes are available: strict and loose.
  • Key configuration (Type 1): If the configurations of two devices in the M-LAG are inconsistent, problems may occur, for example, loops may occur or packets are discarded for a long period of time though the M-LAG status is normal.

    In strict mode, if the key configuration of two devices in the M-LAG is inconsistent, member interfaces on the M-LAG backup device enter the Error-Down state and the alarm about key configuration inconsistency is generated.

    In loose mode, if the key configuration of two devices in the M-LAG is inconsistent, the alarm about key and common configuration inconsistency is generated.

  • Common configuration (Type 2): If the configurations of two devices in the M-LAG are inconsistent, the M-LAG status may be abnormal. Compared with the key configuration, the common configuration problem can be easily detected and has less impact on the live network.

    Regardless of the mode, if the following common configuration of two devices in the M-LAG is inconsistent, the alarm about key and common configuration inconsistency is generated.

Table 4-2 M-LAG consistency check list

View

Configuration

Type

System view

Whether STP is enabled

Type 1

STP working mode

Whether BPDU protection is enabled

Mapping between VLANs and MSTIs

NOTE:
The device checks the mapping between VLANs and MSTIs in STP process 0.

M-LAG member interface view

Whether STP is enabled

Whether root protection is enabled

LACP mode

System view

VLAN configuration

Type 2

Bridge Domain (BD) configuration
  • BD ID
  • VNI associated with the BD
VBDIF interface configuration
  • BD ID
  • IPv4 address
  • IPv6 address
  • VRRP4 group
  • MAC address
  • Status
NOTE:

The device only checks the virtual MAC address by default.

For the IPv6 address and VRRP4 configuration, the consistency check only take effect when the VBDIF interface is up. If the VBDIF interface is down, the preceding configurations do not take effect on the interface.

VLANIF interface configuration
  • VLAN ID
  • IPv4 address
  • IPv6 address
  • VRRP4 group
  • VRRP6 group
  • MAC address
  • Status
NOTE:

The device only checks the virtual MAC address by default.

For the IPv6 address and VRRP4 configuration, the consistency check only take effect when the VLANIF interface is up. If the VLANIF interface is down, the preceding configurations do not take effect on the interface.

M-LAG member interface view

STP priority

VLAN ID

Parameters

Translation
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Updated: 2019-05-08

Document ID: EDOC1100004351

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