Configuring Bgp Route Attributes; Configuration Prerequisites - H3C S5600 SERIES Operation Manual

Assessing the stability of a route is based on the behavior of the route in the previous time. Once a route
flaps, it receives a certain penalty value. When the penalty value reaches the suppression threshold,
this route is suppressed. The penalty value decreases with time. When the penalty value of a
suppressed route decreases to the reuse threshold, the route gets valid and is thus advertised again.
BGP dampening suppresses unstable routing information. Suppressed routes are neither added to the
routing table nor advertised to other BGP peers.
Follow these steps to configure BGP route dampening:
To do...
Enter system view
Enter BGP view
Configure BGP route
dampening-related
parameters

Configuring BGP Route Attributes

Configuration Prerequisites

Before configuring BGP routing policy, enable basic BGP functions.
Before configuring BGP routing policy, make sure the following information is available.
BGP priority value
LOCAL_PREF value
MED value
Configuring BGP Route Attributes
BGP possesses many route attributes for you to control BGP routing policies.
Follow these steps to configure BGP route attributes:
To do...
Enter system view
Enter BGP view
Configure the management
preference of the exterior,
interior and local routes
Set the default local preference
Use the command...
system-view
bgp as-number
dampening
[ half-life-reachable
half-life-unreachable reuse
suppress ceiling ]
[ route-policy
route-policy-name ]
Use the command...
system-view
bgp as-number
preference ebgp-value
ibgp-value local-value
default local-preference
value
5-21
Remarks
—
—
Optional
Not configured by default.
The defaults are as follows:
half-life-reachable: 15 (in minutes)
half-life-unreachable: 15 (in minutes)
reuse: 750
suppress: 2000
ceiling: 16000
Remarks
—
—
Optional
By default, the management
preference of the exterior, interior
and local routes is 256, 256, and
130.
Optional
By default, the local preference
defaults to 100.