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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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Application Scenarios for M-LAG

Application Scenarios for M-LAG

M-LAG mainly applies to scenarios where a server or switch is dual-homed to an Ethernet, Transparent Interconnection of Lots of Links (TRILL), Virtual eXtensible Local Area Network (VXLAN), or IP network. It provides load balancing and backup. M-LAG falls into single-level M-LAG and multi-level M-LAG.

Single-level M-LAG

  • Connecting a switch in dual-homing mode

    As shown in Figure 4-17, to ensure reliability, a switch is connected to a network to implement link redundancy. MSTP can be deployed to implement redundancy, but the link use efficiency is low and many bandwidth resources are wasted. To implement redundancy and improve the link use efficiency, deploy M-LAG between SwitchA and SwitchB so that the switch can be dual-homed to SwitchA and SwitchB. SwitchA and SwitchB load balance traffic. When one device fails, traffic can be rapidly switched to the other device to ensure nonstop service transmission.

    Figure 4-17 Connecting a switch in dual-homing mode
  • Connecting a server in dual-homing mode

    As shown in Figure 4-18, to ensure reliability, a server is often connected to a network through link aggregation. If the device connected to the server fails, services are interrupted. To prevent this problem, a server can connect to a network through M-LAG. That is, deploy M-LAG between SwitchA and SwitchB and connect the server to SwitchA and SwitchB. SwitchA and SwitchB load balance traffic. When one device fails, traffic can be rapidly switched to the other device to ensure nonstop service transmission.

    NOTE:

    The configuration of dual homing a server is the same as common link aggregation configuration. Ensure that the server and switches use the same link aggregation mode. The LACP mode at both ends is recommended.

    Figure 4-18 Connecting a server in dual-homing mode

Multi-level M-LAG

As shown in Figure 4-19, after M-LAG is deployed between SwitchA and SwitchB, M-LAG is deployed between SwitchC and SwitchD. The two M-LAGs are connected. This deployment simplifies networking and allows more servers to be connected to the network in dual-homing mode. Before deploying multi-level M-LAG, configure Virtual Spanning Tree Protocol (V-STP).

Figure 4-19 Networking of multi-level M-LAG
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Updated: 2019-05-08

Document ID: EDOC1100004351

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