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5 Using MLAG in Dell Networks

1 Introduction

MLAGs provide an active-active split aggregation deployment across two switches acting as one. MLAG

creates a more resilient network with higher bandwidth capabilities. This white paper discusses MLAGs,

how and when they are used, caveats to look out for, and instructions on how to implement MLAG into

your network.

Figure 1 below shows two very basic examples of MLAG domains. In both examples, peer switches are

linked together with a special LAG (one or more cables as denoted by the red line in the pictures below),

called a Peer-Link. Any non-management port on the switch can be used in the Peer-Link. With the

Peer-Link configured, the two switches appear as a single switch to partner switches upstream and

downstream. Each partner switch contains MLAGs that are simply LAGs (link aggregation groups) whose

cables are split between the two peers. Primary and secondary peer roles are chosen automatically by the

program when MLAG is enabled.

MLAG

Secondary MLAG peer

Peer-Link

MLAG

Secondary MLAG peer

Peer-Link

MLAG

Primary MLAG peer

Partner Switch

Partner Switch Partner Switch

MLAG domain

appears as a single

logical switch to

partner switches on

the network

Simple L2 MLAG

L3 MLAG with mulitple

partner switches

MLAG domain

Two examples of a single-tier MLAG topology Figure 1

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Dell N2000 How to Use Page 5