BGP Graceful Restart

This feature introduces graceful protocol restart for BGP. Graceful restart enables a routing device undergoing a restart to inform its adjacent neighbors and peers of its condition. This allows the BGP protocol to recalculate adjacencies with neighboring routers, restore routing table entries, and update other protocol-specific information seamlessly after a service interruption. Graceful protocol restart allows a restarting router and its neighbors to continue forwarding packets after a service interruption without disrupting network performance. Graceful restart is disabled by default. However, helper mode, which is the ability to assist a neighboring router attempting a graceful restart, is enabled by default when the routing platform is started, even if graceful restart is not enabled. You can disable graceful restart helper mode on a per-protocol basis.