Reference Guide

● Save all forwarding information base (FIB) and content addressable memory (CAM) entries on the line card and continue
forwarding traffic while the secondary route processor module (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 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.
To enable graceful restart, use the following command.
bgp graceful-restart [restart-time seconds] [stale-path-time seconds] [role receiver-only]
To return to the default, use the no bgp graceful-restart command.
● Enable graceful restart for the BGP node.
CONFIG-ROUTER-BGP mode
bgp graceful-restart
● Set maximum restart time, in seconds, to restart and bring-up all the peers.
CONFIG-ROUTER-BGP mode
bgp graceful-restart [restart-time time-in-seconds]
The default is 120 seconds.
● Set maximum time, in seconds, 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.
● Enable the local router to support graceful restart as a receiver only.
CONFIG-ROUTER-BGP mode
bgp graceful-restart [role receiver-only]
The below example configuration shows how to enable the BGP graceful restart.
DellEMC# configure terminal
DellEMC(conf)# router bgp 400
DellEMC(conf-router_bgp)# bgp graceful-restart
DellEMC(conf-router_bgp)# exit
Redistributing Routes
In addition to filtering routes, you can add routes from other routing instances or protocols to the BGP process. You
can configure the device to redistribute ISIS, OSPF, static, or directly connected routes into BGP process using the
redistribute command.
To add routes from other routing instances or protocols, use any of the following commands in ROUTER BGP mode.
● Include directly connected or user-configured (static) routes into BGP.
ROUTER BGP or CONF-ROUTER_BGPv6_ AF mode
redistribute {connected | static} [route-map map-name]
Configure the following parameters:
○ connected: Indicate that you are redistributing routes to directly connected routes into BGP.
○ static: Indicate that you are redistributing static routes into BGP.
○ route-map map-name: Specify the name of a configured route map to be consulted before adding the connected or
static route.
● Include specific ISIS routes into BGP.
ROUTER BGP or CONF-ROUTER_BGPv6_ AF mode
redistribute isis [level-1 | level-1-2 | level-2] [metric value] [route-map map-name]
Configure the following parameters:
○ isis: Indicate that you are redistributing ISIS routes into BGP.
○ level-1, level-1-2, or level-2: Assign all redistributed routes to a level. The default is level-2.
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Border Gateway Protocol (BGP)