Enabling Neighbor Graceful Restart; Filtering On An As-Path Attribute - Dell S6000–ON Configuration Manual

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.
• Local router supports graceful restart for this neighbor or peer-group as a receiver only.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | peer-group-name} graceful-restart [role receiver-only]
• Set the maximum time to retain the restarting neighbor's or peer-group's stale paths.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | peer-group-name} graceful-restart [stale-path-time
time-in-seconds]
The default is 360 seconds.

Filtering on an AS-Path Attribute

You can use the BGP attribute, AS_PATH, to manipulate routing policies.
The AS_PATH attribute contains a sequence of AS numbers representing the route's path. As the route
traverses an AS, the ASN is prepended to the route. You can manipulate routes based on their AS_PATH
to affect interdomain routing. By identifying certain ASN in the AS_PATH, you can permit or deny routes
based on the number in its AS_PATH.
Border Gateway Protocol IPv4 (BGPv4)
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