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show route damping

date_range 19-Nov-23

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Syntax

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show route damping (decayed | history | suppressed)
<brief | detail | extensive | terse>
<logical-system (all | logical-system-name)>

Syntax (EX Series Switch and QFX Series)

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show route damping (decayed | history | suppressed)
<brief | detail | extensive | terse>

Description

Display the BGP routes for which updates might have been reduced because of route flap damping.

Options

brief \| detail \| extensive \| terse	(Optional) Display the specified level of output. If you do not specify a level of output, the system defaults to brief.
decayed	Display route damping entries that might no longer be valid, but are not suppressed.
history	Display entries that have already been withdrawn, but have been logged.
logical-system (all \| `logical-system-name`)	(Optional) Perform this operation on all logical systems or on a particular logical system.
suppressed	Display entries that have been suppressed and are no longer being installed into the forwarding table or exported by routing protocols.

Required Privilege Level

view

Output Fields

Table 1 lists the output fields for the show route damping command. Output fields are listed in the approximate order in which they appear.

Table 1: show route damping Output Fields
Field Name	Field Description	Level of Output
`routing-table-name`	Name of the routing table—for example, `inet.0`.	All levels
`destinations`	Number of destinations for which there are routes in the routing table.	All levels
`number routes`	Number of routes in the routing table and total number of routes in the following states: `active` `holddown` (routes that are in a pending state before being declared inactive) `hidden` (the routes are not used because of a routing policy)	All levels
`destination-prefix (entry, announced)`	Destination prefix. The `entry` value is the number of routes for this destination, and the `announced` value is the number of routes being announced for this destination.	`detail extensive`
`[protocol, preference]`	Protocol from which the route was learned and the preference value for the route. `+`—A plus sign indicates the active route, which is the route installed from the routing table into the forwarding table. `-` —A hyphen indicates the last active route. `*`—An asterisk indicates that the route is both the active and the last active route. An asterisk before a `to` line indicates the best subpath to the route. In every routing metric except for the BGP `LocalPref` attribute, a lesser value is preferred. In order to use common comparison routines, Junos OS stores the 1's complement of the `LocalPref` value in the `Preference2` field. For example, if the LocalPref value for Route 1 is 100, the Preference2 value is -101. If the `LocalPref` value for Route 2 is 155, the `Preference2` value is -156. Route 2 is preferred because it has a higher `LocalPref` value and a lower `Preference2` value.	All levels
`Next-hop reference count`	Number of references made to the next hop.	`detail extensive`
`Source`	IP address of the route source.	`detail extensive`
`Next hop`	Network layer address of the directly reachable neighboring system.	`detail extensive`
`via`	Interface used to reach the next hop. If there is more than one interface available to the next hop, the interface that is actually used is followed by the word `Selected`.	`detail extensive`
`Protocol next hop`	Network layer address of the remote routing device that advertised the prefix. This address is used to derive a forwarding next hop.	`detail extensive`
`Indirect next hop`	Index designation used to specify the mapping between protocol next hops, tags, kernel export policy, and the forwarding next hops.	`detail extensive`
`State`	Flags for this route. For a description of possible values for this field, see the output field table for the show route detail command.	`detail extensive`
`Local AS`	AS number of the local routing device.	`detail extensive`
`Peer AS`	AS number of the peer routing device.	`detail extensive`
`Age`	How long the route has been known.	`detail extensive`
`Metric`	Metric for the route.	`detail extensive`
`Task`	Name of the protocol that has added the route.	`detail extensive`
`Announcement bits`	List of protocols that announce this route. `n-Resolve inet` indicates that the route is used for route resolution for next hops found in the routing table. `n` is an index used by Juniper Networks customer support only.	`detail extensive`
`AS path`	AS path through which the route was learned. The letters at the end of the AS path indicate the path origin, providing an indication of the state of the route at the point at which the AS path originated: `I`—IGP. `E`—EGP. `?`—Incomplete; typically, the AS path was aggregated. When AS path numbers are included in the route, the format is as follows: `[ ]`—Brackets enclose the local AS number associated with the AS path if more than one AS number is configured on the routing device or if AS path prepending is configured. `{ }`—Braces enclose AS sets, which are groups of AS numbers in which the order does not matter. A set commonly results from route aggregation. The numbers in each AS set are displayed in ascending order. `( )`—Parentheses enclose a confederation. `( [ ] )`—Parentheses and brackets enclose a confederation set. Note: In Junos OS Release 10.3 and later, the AS path field displays an unrecognized attribute and associated hexadecimal value if BGP receives attribute 128 (attribute set) and you have not configured an independent domain in any routing instance.	All levels
`to`	Next hop to the destination. An angle bracket (>) indicates that the route is the selected route.	`brief` none
`via`	Interface used to reach the next hop. If there is more than one interface available to the next hop, the interface that is actually used is followed by the word `Selected`.	`brief` none
`Communities`	Community path attribute for the route. See the output field table for the show route detail command.	`detail extensive`
`Localpref`	Local preference value included in the route.	All levels
`Router ID`	BGP router ID as advertised by the neighbor in the open message.	`detail extensive`
`Merit (last update/now)`	Last updated and current figure-of-merit value.	`detail extensive`
`damping-parameters`	Name that identifies the damping parameters used, which is defined in the damping statement at the `[edit policy-options]` hierarchy level.	`detail extensive`
`Last update`	Time of most recent change in path attributes.	`detail extensive`
`First update`	Time of first change in path attributes, which started the route damping process.	`detail extensive`
`Flaps`	Number of times the route has gone up or down or its path attributes have changed.	`detail extensive`
`Suppressed`	(`suppressed` keyword only) This route is currently suppressed. A suppressed route does not appear in the forwarding table and routing protocols do not export it.	All levels
`Reusable in`	(`suppressed` keyword only) Time when a suppressed route will again be available.	All levels
`Preference will be`	(`suppressed` keyword only) Preference value that will be applied to the route when it is again active.	All levels

show route damping decayed detail

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user@host> show route damping decayed detail
inet.0: 173319 destinations, 1533668 routes (172625 active, 4 holddown, 108083 hidden)
10.0.111.0/24 (7 entries, 1 announced)
        *BGP    Preference: 170/-101
                Next-hop reference count: 151973
                Source: 172.23.2.129
                Next hop: via so-1/2/0.0
                Next hop: via so-5/1/0.0, selected
                Next hop: via so-6/0/0.0
                Protocol next hop: 172.23.2.129
                Indirect next hop: 89a1a00 264185
                State: <Active Ext>
                Local AS: 64500 Peer AS:   64490
                Age: 3:28       Metric2: 0
                Task: BGP_64490.172.23.2.129+179
                Announcement bits (6): 0-KRT 1-RT 4-KRT 5-BGP.0.0.0.0+179                 
         6-Resolve tree 2 7-Resolve tree 3
                AS path: 64499 64510 645511 645511 645511 645511 I ()
                Communities: 65551:390 65551:2000 65551:3000 65550:701
                Localpref: 100
                Router ID: 172.23.2.129
                Merit (last update/now): 1934/1790
                damping-parameters: damping-high
                Last update:       00:03:28 First update:       00:06:40
                Flaps: 2

show route damping history

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user@host> show route damping history    
inet.0: 173320 destinations, 1533529 routes (172624 active, 6 holddown, 108122 hidden)
+ = Active Route, - = Last Active, * = Both

10.108.0.0/15       [BGP ] 2d 22:47:58, localpref 100
                      AS path: 64220 65541 65542 I
                    > to 192.168.60.85 via so-3/1/0.0

show route damping history detail

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user@host> show route damping history detail   
inet.0: 173319 destinations, 1533435 routes (172627 active, 2 holddown, 108105 hidden)
10.108.0.0/15 (3 entries, 1 announced)
         BGP                 /-101
                Next-hop reference count: 69058
                Source: 192.168.60.85
                Next hop: 192.168.60.85 via so-3/1/0.0, selected
                State: <Hidden Ext>
                Inactive reason: Unusable path 
                Local AS: 64500 Peer AS:  64220
                Age: 2d 22:48:10
                Task: BGP_64220.192.168.60.85+179
                AS path: 64220 65541 65542 I ()
                Communities: 65541:390 65541:2000 65541:3000 65504:3561
                Localpref: 100
                Router ID: 192.168.80.25
                Merit (last update/now): 1000/932
                damping-parameters: set-normal
                Last update:       00:01:05 First update:       00:01:05
                Flaps: 1

Release Information

Command introduced before Junos OS Release 7.4.

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Junos CLI Reference

ON THIS PAGE

show route damping

Syntax

Syntax (EX Series Switch and QFX Series)

Description

Options

Required Privilege Level

Output Fields

Sample Output

show route damping decayed detail

show route damping history

show route damping history detail

Release Information

Junos CLI Reference

ON THIS PAGE

show route damping

Syntax

Syntax (EX Series Switch and QFX Series)

Description

Options

Required Privilege Level

Output Fields

Sample Output

show route damping decayed detail

show route damping history

show route damping history detail

Release Information

Related Documentation