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Supported Platforms
Related Documentation
- ACX, EX, J, M, MX, PTX, QFX, SRX, T Series
- clear bgp damping
- ACX, EX, J, M, MX, PTX, QFX, T Series
- show policy damping
show route damping
Syntax
Syntax (EX Series Switch and QFX Series)
Release Information
Command introduced before Junos OS Release 7.4.
Command introduced in Junos OS Release 9.0 for EX Series switches.
Command introduced in Junos OS Release 11.3 for the QFX Series.
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history | — | Display entries that have already been withdrawn, but have been logged.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
Related Documentation
- ACX, EX, J, M, MX, PTX, QFX, SRX, T Series
- clear bgp damping
- ACX, EX, J, M, MX, PTX, QFX, T Series
- show policy damping
List of Sample Output
show route damping decayed detailshow route damping history
show route damping history detail
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:
| 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.
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:
When AS path numbers are included in the route, the format is as follows:
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 |
Sample Output
show route damping decayed detail
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: 65000 Peer AS: 65490 Age: 3:28 Metric2: 0 Task: BGP_65490.172.23.2.129+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: 65490 65520 65525 65525 65525 65525 I () Communities: 65501:390 65501:2000 65501:3000 65504:701 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
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: 65220 65501 65502 I > to 192.168.60.85 via so-3/1/0.0
show route damping history detail
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: 65000 Peer AS: 65220 Age: 2d 22:48:10 Task: BGP_65220.192.168.60.85+179 AS path: 65220 65501 65502 I () Communities: 65501:390 65501:2000 65501:3000 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
Published: 2013-08-15
Download This Guide
Supported Platforms
Related Documentation
- ACX, EX, J, M, MX, PTX, QFX, SRX, T Series
- clear bgp damping
- ACX, EX, J, M, MX, PTX, QFX, T Series
- show policy damping