Brocade TurboIron 24X Series Configuration Guide - Manual (Page 758)

724 Brocade TurboIron 24X Series Configuration Guide
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Configuring route flap dampening
The <max-suppress-time> parameter specifies the maximum number of minutes that a route can
be suppressed regardless of how unstable it is. You can set the maximum suppression time to a
value from 1 – 20000 minutes. The default is four times the half-life setting. Thus, if you use the
default half-life of 15 minutes, the maximum suppression time is 60 minutes.
The following example shows how to change the dampening parameters.
TurboIron(config-bgp-router)#dampening 20 200 2500 40
This command changes the half-life to 20 minutes, the reuse threshold to 200, the suppression
threshold to 2500, and the maximum number of minutes a route can be dampened to 40.
NOTE
To change any of the parameters, you must specify all the parameters with the command. If you want
to leave some parameters unchanged, enter their default values.
Using a route map to configure route flap dampening
for specific routes
Route maps enable you to fine tune route flap dampening parameters for individual routes. To
configure route flap dampening parameters using route maps, configure BGP4 address filters for
each route you want to set the dampening parameters for, then configure route map entries that
set the dampening parameters for those routes. The following sections show examples.
To configure address filters and a route map for dampening specific routes, enter commands such
as the following.
The address-filter commands in this example configure two BGP4 address filters, for networks
10.157.22.0 and 10.157.23.0. The first route-map command creates an entry in a route map called
“DAMPENING_MAP”. Within this entry of the route map, the match command matches based on
address filter 9, and the set command sets the dampening parameters for the route that matches.
Thus, for BGP4 routes to 10.157.22.0, the Layer 3 Switch uses the route map to set the dampening
parameters. These parameters override the globally configured dampening parameters.
The commands for the second entry in the route map (instance 10 in this example) perform the
same functions for route 10.157.23.0. Notice that the dampening parameters are different for
each route.
TurboIron(config)#router bgp
TurboIron(config-bgp-router)#address-filter 9 permit 10.157.22.0 255.255.255.0
255.255.255.0 255.255.255.0
TurboIron(config-bgp-router)#address-filter 10 permit 10.157.23.0 255.255.255.0
255.255.255.0 255.255.255.0
TurboIron(config-bgp-router)#exit
TurboIron(config)#route-map DAMPENING_MAP permit 9
TurboIron(config-routemap DAMPENING_MAP)#match address-filters 9
TurboIron(config-routemap DAMPENING_MAP)#set dampening 10 200 2500 40
TurboIron(config-routemap DAMPENING_MAP)#exit
TurboIron(config)#route-map DAMPENING_MAP permit 10
TurboIron(config-routemap DAMPENING_MAP)#match address-filters 10
TurboIron(config-routemap DAMPENING_MAP)#set dampening 20 200 2500 60
TurboIron(config-routemap DAMPENING_MAP)#router bgp
TurboIron(config-bgp-router)#dampening route-map DAMPENING_MAP