Bgp Route Preference Settings; Bgp Dampening Settings - D-Link DXS-3600 Series Reference Manual

DXS-3600 Series Layer 3 Managed 10Gigabit Ethernet Switch Web UI Reference Guide
Parameter
Metric
Route Map Name
Click the Apply button to accept the changes made.

BGP Route Preference Settings

This window is used to view and configure the BGP route's preference settings.
To view the following window, click L3 Features > BGP > BGP Route Preference Settings, as shown
below:
The fields that can be configured in BGP Route Preference Settings are described below:
Parameter
Address Family
Distance EBGP
Distance IBGP
Click the Apply button to accept the changes made.

BGP Dampening Settings

This window is used to view and configure the BGP dampening settings. The purpose of this feature is to
eliminate the advertising of the unstable routes and thus to avoid unstable of the network caused by
flapping routes.
When a prefix is removed or is added, BGP increases the penalty of the route by 1000. When the
attribute of a received route has changes, BGP increases the penalty of the route by 500.
Supposed that half-life is configured as 15 min, re-use 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.
Description
Enter the BGP metric value for the redistributed routes here. The
range is from 0 to 4294967295.
Enter the route map's name here used to filter the networks to be
redistributed. If not specified, all networks are redistributed.
Figure 6-152 BGP Route Preference Settings Window
Description
Select the address family used here. Options to choose from are IPv4
Unicast and IPv4 VRF.
After selecting the IPv4 VRF option, enter the VRF instance's name
that will be used here. This name can be up to 12 characters long.
Alternatively, click the Please Select button to open a new window to
select and use a configured VRF instance from the list.
Enter the distance value for routes learned from external peers here.
The range is from 1 to 255. By default, this value is 70.
Enter the distance value for routes learned from internal peers here.
The range is from 1 to 255. By default, this value is 130.
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