D-Link DXS-3600 Series Reference Manual page 157

DXS-3600 Series Layer 3 Managed 10Gigabit Ethernet Switch CLI Reference Guide
Supposed that half-life is configured as 15 min, reuse is 800, and suppress is 1500.
When a route flaps (from up to down), 1000 is added to the penalty of the route. Since the penalty is
smaller than the suppress value, the route works normally. A withdraw message (an update message) is
sent to the neighbors.
As the half-life timer expired, the penalty of the route becomes 500. If another flaps occur, the penalty of
the route keep being increased. If it is larger than the suppress value, then the route will be dampened.
BGP will not advertise message for the dampened route.
As the time passed, the penalty of the route decreased. If the penalty of the route falls below the reuse
threshold, the route will be restored as a normal route and update message will be sent for the route.
If a route map is configured but the route map doesn't exist, it acts as all routes are enabled for
dampening.
Example
This example shows how to configure the BGP process 10000. The BGP dampening values are set to 20
minutes for the half-life, 2500 for the reuse value, 8000 for the suppress value, and 80 minutes for the
maximum suppress time.
Switch# configure terminal
Switch(config)# router bgp 10000
Switch(config-router)# bgp dampening 20 2500 8000 80 20
10-16 bgp default ipv4-unicast
This command is used to enable the exchange of IPv4 unicast routing information. Use the no command
to disable the exchange of IPv4 unicast prefixes.
bgp default ipv4-unicast
no bgp default ipv4-unicast
Parameters
None.
Default
IPv4 unicast routing information exchange is enabled.
Command Mode
Router Configuration Mode.
Command Default Level
Level: 12.
Usage Guideline
Use this command in the router configuration mode to enable the exchange of IPv4 unicast routing
information for all the subsequently created neighbor sessions. Use the no bgp default ipv4-unicast
command to disable the automatic exchange of IPv4 unicast routing information.
Use the neighbor activate in address family configuration to activate the exchange of routing information
of specific address family with a BGP neighbor.
Example
This example shows how to disable the exchange of IPv4 unicast address prefixes.
Switch# configure terminal
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