Distributed and Centralized Routing

You can configure L3 routers in centralized mode or distributed mode.

In centralized mode, routing is configured only on the border leaf pairs. In contrast, for distributed mode, routing is configured on the corresponding leaf nodes where the endpoints reside.

You can provide centralized mode or distributed mode as input when you configure a router.

openstack router create R1  --distributed
openstack router create R2  --centralized

The default option is centralized

The L3 service plugin passes the routing information to XCO. Based on the configuration mode, the XCO tenant service configures VRF or routing on border leafs or on leaf nodes.

Note

• The OpenStack integration works with only one pair of border leaf devices. The centralized routing instance is created on this pair. Ensure that you add only one border leaf pair during fabric creation.
• Only centralized router is supported. The creation of a distributed router is disabled.