Graceful Restart in EVPN
Starting in Junos OS 18.4R1 graceful restart is supported on devices in an EVPN-VXLAN network. Graceful restart allows a routing engine undergoing a switchover without NSR to inform its adjacent neighbors and peers of its condition. When you enable graceful-restart, the routing protocol process learns of newly acquired MAC addresses by listening to the BGP ingress and egress routing table messages. It then verifies MAC addresses learned from the l2ald, with MAC addresses derived from the BGP routing table egress messages. Graceful restart enables the device to reduce the overall network traffic loss while the device is passing through the intermediate convergence states that occurs during a restart.
To enable graceful restart, include the graceful-restart statement at the [edit routing-options] hierarchy level.