Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

EVPN LAG Configuration Best Practices

 

Junos OS on QFX Series switches support Enterprise style configuration and Service Provider style configuration.

Both configuration styles can be used to configure EVPN LAGs. We recommend using the Enterprise configuration style because it supports more data center features like storm control profiles and BPDU blocking without having to enable RSTP on the leaf devices.

This section covers EVPN LAG configuration using both configuration styles.

EVPN LAG Configuration of a CRB Architecture Using the Enterprise Configuration Style

The Enterprise configuration style is the recommended way to enable EVPN LAG functionality in most data center architectures. Enterprise style provisioning is generally simpler than Service Provider style provisioning and generally is more compatible with other Layer 2 features.

The following configuration provides a sample EVPN LAG configuration done using the Enterprise configuration style on the leaf devices in a Centrally Routed Bridging architecture.

EVPN LAG Configuration of a CRB Architecture Using the Service Provider Configuration Style

The QFX5110 switches also support the Service Provider style of configuration. When configuring EVPN LAGs in the Service Provider configuration style, multiple units per given EVPN LAG are assigned. These multiple units provide an opportunity to enable more selective filter and rate limiting per unit interface, but these assignments must be done on a per unit basis and are therefore burdensome to configure and maintain. This granularity is generally not needed in data center architectures using spine and leaf topologies, so we do not recommend using Service Provider style configuration when enabling EVPN LAGs in most data center environments.

The following configuration provides a sample EVPN LAG configuration done using the Service Provider configuration style. This configuration is supported when QFX5110 or QFX5120 switches are operating in the leaf device role in an architecture where the IRBs are not on the leaf devices, which are the Centrally Routed Bridging (CRB) and Bridged Overlay (BO) architectures. The Enterprise configuration style must be used to enable EVPN LAGs when a QFX5110 or QFX5120 switch is used as the leaf device in an Edge Routed Bridging (ERB) architecture.