Summary

Layer 2 EVPN services with VXLAN dataplane are very common in multi-tenant data centers. In this tutorial we walked through every step that is needed to configure a basic Layer 2 EVPN with VXLAN dataplane service deployed on SR Linux switches:

• IP fabric config using eBGP in the underlay
• EVPN service config on leaf switches with the control and data plane verification

The highly detailed configuration & verification steps helped us achieve the goal of creating an overlay Layer 2 broadcast domain for the two servers in our topology. So that the high level service diagram transformed into a detailed map of configuration constructs and instances.

During the verification phases we collected the following packet captures to prove the control/data plane behavior:

• Exchange of the IMET/RT3 EVPN routes. IMET/RT3 routes are the starting point in the L2 EVPN-VXLAN services, as they are used to dynamically discover the VXLAN VTEPs participating in the same EVI.
• Exchange of MAC-IP/RT2 EVPN routes which convey the MAC information of the attached servers. These routes are used to create unicast tunnel destinations that the dataplane frames will use.

Comments