Configuring Flap Damping To Reduce The Number Of Bgp Update Messages(Nsm Procedure) - Juniper NETWORK AND SECURITY MANAGER - NSM CONFIGURATION GUIDE FOR EX SERIES DEVICES REV 3 Configuration Manual

Table 33: Condition Configuration Details
Option
Name
Comment
Route Active On
Configuring Flap Damping to Reduce the Number of BGP Update Messages(NSM
Procedure)
Copyright © 2010, Juniper Networks, Inc.
NOTE: After you make changes to a device configuration, you must push that
updated device configuration to the physical security device for those changes
to take effect. You can update multiple devices at one time. See the Updating
Devices section in the Network and Security Manager Administration Guide for
more information.
Function
Specifies the name of the condition.
Specifies the comment for the condition.
Enables you to specify the policy
condition based on the existing routes
and the corresponding route tables.
To advertise network reachability information, BGP systems send an excessive number
of update messages. You can use flap damping to reduce the number of update messages
sent between BGP peers, thereby reducing the load on these peers without adversely
affecting the route convergence time. Damping reduces the number of update messages
by marking these routes as ineligible, so that they cannot be selected as active or
preferable routes. Applying damping leads to some delay, or suppression, in the
propagation of route information, but the result is increased network stability. You can
define actions by creating a named set of damping parameters and including the set in
a routing policy.
To configure damping for a BGP routing policy in NSM:
In the navigation tree, select Device Manager > Devices.
1.
In the Devices list, double-click the device to select it.
2.
Click the Configuration tab.
3.
In the configuration tree, expand Policy Options.
4.
Select Damping.
5.
Chapter 6: Configuring Policy Options
Your Action
Enter a name.
Enter a comment.
1. Select Route Active On.
2. Select one:
None—No policy condition based
on routes need to be specified.
if-route-exists—Specify the policy
condition based on the routes.
Enter the comment, route and the
corresponding routing table.
3. Click OK.
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