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show policy damping
Syntax
- show policy damping
- <logical-system (all | logical-system-name)>
Release Information
Command introduced before JUNOS Release
7.4.
Description
Display information about Border Gateway Protocol
(BGP) route flap damping parameters.
Options
none — (Same as logical-system
all) Display information about BGP route flap damping parameters
for all logical systems.
logical-system (all | logical-system-name) — (Optional) Perform this operation on
all logical systems or on a particular logical system.
Additional Information
In the output from this command, figure-of-merit
values correlate to the probability of future instability of a router.
Routes with higher figure-of-merit values are suppressed for longer
periods of time. The figure-of-merit value decays exponentially over
time. A figure-of-merit value of zero is assigned to each new route.
The value is increased each time the route is withdrawn or readvertised,
or when one of its path attributes changes.
Required Privilege Level
view
Related Topics
clear bgp damping
show route damping
List of Sample Output
show policy damping
Output Fields
Table 18 describes the output fields
for the show policy damping command. Output fields are listed
in the approximate order in which they appear.
Table 18: show policy damping Output Fields
|
Field Name
|
Field Description
|
|
Halflife
|
Decay half-life, in minutes. The
value represents the period during which the accumulated figure-of-merit
value is reduced by half if the route remains stable. If a route has
flapped, but then becomes stable, the figure-of-merit value for the
route decays exponentially. For example, for a route with a figure-of-merit
value of 1500, if no incidents occur, its figure-of-merit value is
reduced to 750 after 15 minutes and to 375 after another 15 minutes.
|
|
Reuse merit
|
Figure-of-merit value below which
a suppressed route can be used again. A suppressed route becomes reusable
when its figure-of-merit value decays to a value below a reuse threshold,
and the route once again is considered usable and can be installed
in the forwarding table and exported from the routing table.
|
|
Suppress/cutoff metric
|
Figure-of-merit value above which
a route is suppressed for use or inclusion in advertisements. When
a route's figure-of-merit value reaches a particular level, called
the cutoff or suppression threshold, the route is suppressed. When
a route is suppressed, the routing table no longer installs the route
into the forwarding table and no longer exports this route to any
of the routing protocols.
|
|
Maximum suppress time
|
Maximum hold-down time, in minutes.
The value represents the maximum time that a route can be suppressed
no matter how unstable it has been before this period of stability.
|
|
Computed values
|
-
Merit ceiling—Maximum merit that a flapping
route can collect.
-
Maximum decay—Maximum decay half-life,
in minutes.
|
Sample Output
show policy damping
user@host> show policy damping
Default damping information:
Halflife: 15 minutes
Reuse merit: 750 Suppress/cutoff merit: 3000
Maximum suppress time: 60 minutes
Computed values:
Merit ceiling: 12110
Maximum decay: 6193
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