Cumulus Part X - VXLAN EVPN and MLAG
In this post, we take a look at the interaction of MLAG with an EVPN based VXLAN fabric on Cumulus Linux.
Introduction
MLAG or MC-LAG (multi-chassis link aggregation) is a fairly common deployment model at the access/leaf layer of both Enterprise and Data Center networks, typically offered by most leading vendors (with different terminologies - vPC, VSS, stackwise-virtual and so on).
The general idea is to offer redundancy at the access layer by pairing together two access/leaf switches into a common logical switch, from the perspective of any devices downstream. Details of Cumulus' implementation can be found here.
Topology
For this post, we're going to be using the following topology (tested with Cumulus VX 4.2):
