386 CHAPTER 30: BGP CONFIGURATION
Enabling BGP and IGP
Route Synchronization
By default, when a BGP router receives an IBGP route, it only checks the
reachability of the route’s next hop before advertisement. With BGP and IGP
synchronization configured, the BGP router cannot advertise the route to EBGP
peers unless the route is also available in the IGP routing table.
Follow these steps to configure BGP and IGP synchronization:
Configuring BGP Route
Dampening
By configuring BGP route dampening, you can suppress unstable routes from
neither adding them to the local routing table nor advertising them to BGP peers.
Follow these steps to configure BGP route dampening:
Configuring BGP
Route Attributes
Prerequisites Before configuring this task, you have configured BGP basic functions.
Configuration Procedure You can configure BGP route attributes to influence BGP route selection.
Follow these steps to configure BGP route attributes:
To do… Use the command… Remarks
Enter system view system-view -
Enter BGP view bgp as-number -
Enable synchronization
between BGP and IGP
synchronization Required
Not enabled by default
To do… Use the command… Remarks
Enter system view system-view -
Enter BGP view bgp as-number -
Configure BGP route
dampening
dampening [ half-life-reachable
half-life-unreachable reuse suppress
ceiling | route-policy
route-policy-name ] *
Optional
Not configured by default
To do… Use the command… Remarks
Enter system view system-view -
Enter BGP view bgp as-number -
Configure preferences for external,
internal, local routes
preference
{ external-preference
internal-preference
local-preference |
route-policy
route-policy-name }
Optional
The default
preferences of
external, internal,
and local routes are
255, 255, and 130
respectively.
Configure the default local preference default local-preference
value
Optional
100 by default
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