Enabling Neighbor Graceful Restart - Dell S4048T Configuration Manual

• Bring the secondary RPM online as the primary and re-open sessions with all peers operating in No
Shutdown mode.
• Defer best path selection for a certain amount of time. This helps optimize path selection and results in
fewer updates being sent out.
To enable graceful restart, use the configure router bgp graceful-restart command.
• Enable graceful restart for the BGP node.
CONFIG-ROUTER-BGP mode
bgp graceful-restart
• Set maximum restart time for all peers.
CONFIG-ROUTER-BGP mode
bgp graceful-restart [restart-time time-in-seconds]
The default is 120 seconds.
• Set maximum time to retain the restarting peer's stale paths.
CONFIG-ROUTER-BGP mode
bgp graceful-restart [stale-path-time time-in-seconds]
The default is 360 seconds.
• Local router supports graceful restart as a receiver only.
CONFIG-ROUTER-BGP mode
bgp graceful-restart [role receiver-only]

Enabling Neighbor Graceful Restart

BGP graceful restart is active only when the neighbor becomes established. Otherwise, it is disabled.
Graceful-restart applies to all neighbors with established adjacency.
With the graceful restart feature, Dell Networking OS enables the receiving/restarting mode by default. In
Receiver-Only mode, graceful restart saves the advertised routes of peers that support this capability when
they restart. This option provides support for remote peers for their graceful restart without supporting the
feature itself.
You can implement BGP graceful restart either by neighbor or by BGP peer-group. For more information,
refer to the Dell Networking OS Command Line Interface Reference Guide.
• Add graceful restart to a BGP neighbor or peer-group.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | peer-group-name} graceful-restart
• Set the maximum restart time for the neighbor or peer-group.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | peer-group-name} graceful-restart [restart-time time-in-
seconds]
The default is 120 seconds.
Border Gateway Protocol IPv4 (BGPv4) 240