Dell Force10 S4810P Configuration Manual page 213

• Save all FIB and CAM entries on the line card and continue forwarding traffic while the secondary
RPM is coming online.
• Advertise to all BGP neighbors and peer-groups that the forwarding state of all routes has been saved.
This prompts all peers to continue saving the routes they receive from your E-Series and to continue
forwarding traffic.
• 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.
Enable graceful restart using the
the command and its available options:
Command Syntax
bgp graceful-restart
bgp graceful-restart [ restart-time
time-in-seconds]
bgp graceful-restart [ stale-path-time
time-in-seconds]
bgp graceful-restart [ role
receiver-only ]
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, FTOS 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.
However, the E-Series does not advertise that it saves these forwarding states when it restarts. 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,
please see the following table or the FTOS Command Line Interface Reference.
Command Syntax
neighbor {ip-address |
peer-group-name} graceful-restart
neighbor {ip-address |
peer-group-name} graceful-restart
[ restart-time time-in-seconds]
neighbor {ip-address |
peer-group-name} graceful-restart
[ role receiver-only ]
configure router bgp graceful-restart
Command Mode
CONFIG-ROUTER-BGP
CONFIG-ROUTER-BGP
CONFIG-ROUTER-BGP
CONFIG-ROUTER-BGP
Command Mode
CONFIG-ROUTER-BGP
CONFIG-ROUTER-BGP
CONFIG-ROUTER-BGP
command. The table below shows
Usage
Enable graceful restart for the BGP node.
Set maximum restart time for all peers. Default
is 120 seconds.
Set maximum time to retain the restarting peer's
stale paths. Default is 360 seconds.
Local router supports graceful restart as a
receiver only.
Purpose
Add graceful restart to a BGP neighbor or
peer-group.
Set maximum restart time for the neighbor or
peer-group. Default is 120 seconds.
Local router supports graceful restart for this
neighbor or peer-group as a receiver only.
Border Gateway Protocol | 213