Reference Guide

Border Gateway Protocol IPv4 (BGPv4) | 211
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.
You can implement BGP graceful restart either by neighbor or by BGP peer-group. For more information,
please refer to the following table or the Dell Command Line Interface Reference.
Filter on an AS-Path attribute
The BGP attribute, AS_PATH, can be used to manipulate routing policies. The AS_PATH attribute
contains a sequence of AS numbers representing the route’s path. As the route traverses an Autonomous
System, the AS number is prepended to the route. You can manipulate routes based on their AS_PATH to
affect interdomain routing. By identifying certain AS numbers in the AS_PATH, you can permit or deny
routes based on the number in its AS_PATH.
To view all BGP path attributes in the BGP database, use the
show ip bgp paths command in EXEC
Privilege mode (Figure 9-26).
Command Syntax Command Mode Purpose
neighbor {ip-address |
peer-group-name} graceful-restart
CONFIG-ROUTER-
BGP
Add graceful restart to a BGP neighbor or
peer-group.
neighbor {ip-address |
peer-group-name}
graceful-restart
[restart-time time-in-seconds]
CONFIG-ROUTER-
BGP
Set maximum restart time for the neighbor or
peer-group. Default is 120 seconds.
neighbor {ip-address |
peer-group-name} graceful-restart
[role receiver-only]
CONFIG-ROUTER-
BGP
Local router supports graceful restart for this
neighbor or peer-group as a receiver only.
neighbor {ip-address |
peer-group-name} graceful-restart
[stale-path-time time-in-seconds]
CONFIG-ROUTER-
BGP
Set maximum time to retain the restarting
neighbor’s or peer-group’s stale paths. Default is
360 seconds.