Dell Z9000 Configuration Manual page 216

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 Networking OS 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.
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>
To view a count of dampened routes, history routes, and penalized routes when you enable route
dampening, look at the seventh line of the show ip bgp summary command output, as shown in the
following example (bold).
Dell>show ip bgp summary
BGP router identifier 10.114.8.131, local AS number 65515
216
Border Gateway Protocol IPv4 (BGPv4)