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37.14 bgp dampening
Command:
bgp dampening [<1-45>] [<1-20000> <1-20000> <1-255>] [<1-45>]
no bgp dampening
Function:
Configure the route dampening.The “no bgp dampening” command cancels the route dampening
function.
Parameter:
<1-45>: Respectively the penalty half-lives of accessible and inaccessible route, namely the penalty
value is reduced to half of the previous value, in minutes.
<1-20000>: Respectively the penalty reuse border and restrain border.
<1-255>: Maximum restrain route time, in minutes.
Default:
Half-life of accessible route is 15 minutes, 15 minutes for inaccessible. The restrain border is 2000,
reuse border is 750, and maximum restrain time is 60 minutes.
Command Mode:
BGP Route Mode.
Usage Guide:
Abundant route update due to unstable route could be reduced with route dampening technology, of
which the algorithm is lay penalty on the route when the route fluctuates, and when penalty exceeds
the restrain border this route will no longer be advertised. The penalty value will be reduced by time
by the half-life index regulation if the route keeps stable and finally be advertised again when the
penalty falls below the border or the restrain time exceeds the maximum restrain time. This
command is for enabling/disabling the route dampening and configuring its parameters.
Example:
Create a confederation, ID is 600, add 100, 200, 100.300 members.
Switch(config-router)# bgp dampening
37.15 bgp default
Command:
bgp default {ipv4-unicast|local-preference <0-4294967295>}
no bgp default {ipv4-unicast|local-preference [<0-4294967295>]}
Function:
Set the BGP defaults, the “no bgp default {ipv4-unicast|local-preference [<0-4294967295>]}”
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