Direct routing is Arista’s name for deploying “virtual gateways” in an EVPN fabric. It lets multiple devices all act as the default router for a network. It’s sort of like you get with VRRP, but it’s active/active(/active/active…) instead of active/standby like with VRRP. You configure your devices to share a virtual router MAC address and then add a bit of coordination magic so that ARP and friends don’t go wild, and then you can make every L3 switch that’s part of a specific VLANFine, it’s EVPN, so you could argue that it’s a VNI, not a VLAN.
able to route traffic into and out of the network. Client systems just know that their gateway address is 192.168.0.254 (or whatever) and that that address ARPs to 00:00:00:11:11:11 (or whatever); the fabric takes care of making sure that inbound and outbound traffic is handled in a reasonable fashion.

scottstuff.net

Direct routing enables multiple switches in an EVPN fabric to act as active gateways for the same network, similar to VRRP but with active/active operation instead of active/standby. The configuration requires setting up virtual router MAC addresses, virtual IP addresses, and crucially, allocating separate VTEP IPs for different switch clusters. Each MLAG pair needs a shared VTEP IP, standalone switches need their own VTEP IP, and the entire cluster requires an additional shared VTEP IP configured as secondary on all switches' loopback interfaces.

EVPN-VXLAN Direct Routing with Arista