EXEC Privilege
clear ip bgp dampening [ip-address mask]
• View all flap statistics or for specific routes meeting the following criteria.
EXEC or EXEC Privilege mode
show ip bgp flap-statistics [ip-address [mask]] [filter-list as-path-name]
[regexp regular-expression]
– ip-address [mask]: enter the IP address and mask.
– filter-list as-path-name: enter the name of an AS-PATH ACL.
– regexp regular-expression: enter a regular express to match on.
By default, the path selection in Dell is deterministic, that is, paths are compared irrespective of the
order of their arrival. You can change the path selection method to non-deterministic, that is, paths
are compared in the order in which they arrived (starting with the most recent). Furthermore, in non-
deterministic mode, the software may not compare MED attributes though the paths are from the
same AS.
• Change the best path selection method to non-deterministic.
CONFIG-ROUTER-BGP mode
bgp non-deterministic-med
NOTE: When you change the best path selection method, path selection for existing paths
remains unchanged until you reset it by entering the clear ip bgp command in EXEC
Privilege mode.
Example of Configuring a Route for Reuse or Restart
Example of Viewing the Number of Dampened Routes
To view the BGP configuration, use the show config command in CONFIGURATION ROUTER BGP
mode or the
show running-config bgp command in EXEC Privilege mode.
The following example shows how to configure values to reuse or restart a route. In the following
example, default = 15 is the set time before the value decrements, bgp dampening 2 ? is the set
re-advertise value, bgp dampening 2 2000 ? is the suppress value, and bgp dampening 2 2000
3000 ?
is the time to suppress a route. Default values are also shown.
Dell(conf-router_bgp)#bgp dampening ?
<1-45> Half-life time for the penalty (default = 15)
route-map Route-map to specify criteria for dampening
<cr>
Dell(conf-router_bgp)#
bgp dampening 2 ?
<1-20000> Value to start reusing a route (default = 750)
Dell(conf-router_bgp)#bgp dampening 2 2000 ?
<1-20000> Value to start suppressing a route (default = 2000)
Dell(conf-router_bgp)#bgp dampening 2 2000 3000 ?
<1-255> Maximum duration to suppress a stable route (default = 60)
Dell(conf-router_bgp)#bgp dampening 2 2000 3000 10 ?
route-map Route-map to specify criteria for dampening
<cr>
224
Border Gateway Protocol IPv4 (BGPv4)
