https://songkou.github.io/tags/mlag/Recent content in MLAG on Council of ElrondHugoenSun, 19 Jul 2026 02:00:00 +0800https://songkou.github.io/posts/vxlan-evpn-cumulus-5.4-lab-guide/Sun, 19 Jul 2026 02:00:00 +0800https://songkou.github.io/posts/vxlan-evpn-cumulus-5.4-lab-guide/<p>This lab builds a VXLAN EVPN fabric on Cumulus Linux 5.4: one BGP spine, an MLAG leaf pair (leaf1/leaf2) acting as a single logical VTEP, and a standalone leaf (leaf3). Linux1 is dual-homed to the MLAG pair over an LACP bond, while Linux21 and Linux22 share a stretched VLAN with a distributed anycast gateway.</p> <p><strong>Lab requirements</strong></p> <ul> <li>VLAN 100: Linux1 <code>192.168.100.10/24</code>, gateway <code>192.168.100.1</code></li> <li>VLAN 121: Linux21 <code>192.168.121.21/24</code>, Linux22 <code>192.168.121.22/24</code>, anycast gateway <code>192.168.121.1</code> on all leaves</li> </ul> <h2 id="lab-environment">Lab environment</h2> <p>This lab runs in EVE-NG. The four switches (<code>spine</code>, <code>leaf1</code>, <code>leaf2</code>, <code>leaf3</code>) are Cumulus VX 5.4 nodes, and the three hosts (<code>Linux1</code>, <code>Linux21</code>, <code>Linux22</code>) are lightweight Alpine-style Linux nodes configured through <code>/etc/network/interfaces</code> and OpenRC&rsquo;s <code>rc-service</code>. Any emulator that boots Cumulus VX 5.4 with the port mapping in section 2 will work; adjust the host commands if your Linux image uses a different init system or network configuration method.</p>