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Home Documentation Junos OS Junos CLI Reference CLI Reference S

Junos CLI Reference

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Junos CLI Reference
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show isis overview

date_range 19-Nov-23
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Syntax

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show isis overview
<instance instance-name>
<logical-system (all | logical-system-name)>

Syntax (EX Series Switches and QFX Series)

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show isis overview 
<instance instance-name>

Description

Display IS-IS overview information.

Options

none

Display standard overview information about IS-IS for all routing instances.

instance instance-name

(Optional) Display overview information for the specified routing instance.

logical-system (all | logical-system-name)

(Optional) Perform this operation on all logical systems or on a particular logical system.

Required Privilege Level

view

Output Fields

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

Table 1: show isis overview Output Fields

Field Name

Field Description

Hostname

Name of the router.

Sysid

Part of the ISO address of the routing device.

Areaid

The area number of the routing device.

Instance

IS-IS routing instance.

Router ID

Router ID of the routing device.

Adjacency holddown

Adjacency holddown capability: enabled or disabled.

Maximum Areas

Maximum number of IS-IS areas advertised by the routing device.

LSP life time

Lifetime of the link-state PDU, in seconds.

Filter low life time LSPs up to

LSPs with a lifetime lower than this value are filtered out.

Attached bit evaluation

Attached bit capability: enabled or disabled.

SPF delay

Delay before performing consecutive shortest-path-first (SPF) calculations.

SPF holddown

Delay before performing additional SPF calculations after the maximum number of consecutive SPF calculations is reached.

SPF rapid runs

Maximum number of SPF calculations that can be performed in succession before the holddown timer begins.

Overload bit at startup is set

Overload bit capability is enabled.

Overload high metrics

Overload high metrics capability: enabled or disabled.

Allow internal prefix overloading

Allow internal prefixes to be advertised with high metric: enabled or disabled

Allow external prefix overloading

Allow external prefixes to be advertised with high metric: enabled or disabled

Overload timeout

Time period after which overload is reset and the time that remains before the timer is set to expire.

Traffic engineering

Traffic engineering capability: enabled or disabled.

Restart

Graceful restart capability: enabled or disabled.

Restart duration

Time period for complete reacquisition of IS-IS neighbors.

Helper mode

Graceful restart helper capability: enabled or disabled.

Level

IS-IS level:

  • 1—Level 1 information

  • 2—Level 2 information

IPv4 is enabled

IP Protocol version 4 capability is enabled.

IPv6 is enabled

IP Protocol version 6 capability is enabled.

Micro-loop avoidance

Micro-loop avoidance is enabled. Generally adjacent nodes converge faster than neighboring nodes causing traffic to loop. A route convergence delay is configured to avoid such micro loops.

Internal route preference

Preference value of internal routes.

External route preference

Preference value of external routes.

Prefix export limit

Number of prefixes allowed to be exported, as configured by the prefix-export-limit statement.

Prefix export count

Number of prefixes exported.

Wide area metrics are enabled

Wide area metrics capability is enabled.

Narrow metrics are enabled

Narrow metrics capability is enabled.

Adjacency holddown is active

IS-IS adjacencies come up one after another when adjacency holddown is enabled.

SRv6

Indicates the SRv6 capability of the device.

Locator

END-SID is attached to this locator address.

END-SID

Function for the prefix segments.

Flavor

Behavior of the END-SID function. This field can have the following values:

  • PSP—Penultimate segment pop of the segment routing header (SRH).

  • USP—Ultimate segment pop of the SRH.

  • USD—Ultimate segment decapsulation of the SRH.

Sample Output

show isis overview

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user@host> show isis overview
Instance: master
  Router ID: 10.255.107.183
  Hostname: pro-bng3-a
  Sysid: 0192.0168.0001
  Areaid: 49.0002
  Adjacency holddown: enabled
  Maximum Areas: 3
  LSP life time: 1200
  Filter low life time LSPs up to: 300
  Attached bit evaluation: enabled
  SPF delay: 200 msec, SPF holddown: 5000 msec, SPF rapid runs: 3
  Overload bit at startup is set
    Overload high metrics: disabled
    Allow route leaking: disabled
    Allow internal prefix overloading: enabled
    Allow external prefix overloading: enabled
    Overload timeout: 60 sec
  IPv4 is enabled, IPv6 is enabled
Micro-loop avoidance: Enabled
    Method: Route Convergence Delay, Route convergence delay: 5000 msec
  Traffic engineering: enabled
  Restart: Disabled
    Helper mode: Enabled
  Level 1
    Internal route preference: 15
    External route preference: 160
    Wide metrics are enabled, Narrow metrics are enabled
    Adjacency holddown is active
  Level 2
    Internal route preference: 18
    External route preference: 165
    Prefix export limit: 5, Prefix export count: 5
    Wide metrics are enabled
    Adjacency holddown is active

command-name

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user@host> show isis overview (Segment Routing)
Source Packet Routing (SPRING): Enabled
    SRGB Config Range :
      SRGB Start-Label : 40000, SRGB Index-Range : 4000
    SRGB Block Allocation: Success
      SRGB Start Index : 40000, SRGB Size : 4000, Label-Range: [ 40000, 43999 ]
    Node Segments: Enabled
      Ipv4 Index : 11, Ipv6 Index : 12
  SRv6: Enabled
     Locator: 7000::/64, Algorithm: 128
       END-SID: 7000::1, Flavor: PSP, USP, USD
       END-SID: 7000::2, Flavor: None
       END-SID: 7000::3, Flavor: PSP
  Post Convergence Backup: Disabled
  Level 1
    Internal route preference: 15
    External route preference: 160

command-name

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user@host> show isis overview logical-system R2
Instance: master
  Router ID: 192.168.0.2
  Hostname: pro-bng3-a-R2
  Sysid: 0192.0168.0002
  Areaid: 49.0002
  Adjacency holddown: enabled
  Maximum Areas: 3
  LSP life time: 1200
  Attached bit evaluation: enabled
  SPF delay: 200 msec, SPF holddown: 5000 msec, SPF rapid runs: 3
  IPv4 is enabled, IPv6 is enabled
  Traffic engineering: enabled
  Restart: Disabled
    Helper mode: Enabled
  Level 1
    Internal route preference: 15
    External route preference: 160
    Prefix export count: 0
    Wide metrics are enabled, Narrow metrics are enabled
  Level 2
    Internal route preference: 18
    External route preference: 165
    Prefix export count: 0
    Wide metrics are enabled, Narrow metrics are enabled

user@host> show isis overview logical-system R3
Instance: master
  Router ID: 192.168.0.3
  Hostname: pro-bng3-a-R3
  Sysid: 0192.0168.0003
  Areaid: 49.0002
  Adjacency holddown: enabled
  Maximum Areas: 3
  LSP life time: 1200
  Attached bit evaluation: enabled
  SPF delay: 200 msec, SPF holddown: 5000 msec, SPF rapid runs: 3
  IPv4 is enabled, IPv6 is enabled
  Traffic engineering: enabled
  Restart: Disabled
    Helper mode: Enabled
  Level 1
    Internal route preference: 15
    External route preference: 160
    Prefix export count: 0
    Wide metrics are enabled, Narrow metrics are enabled
  Level 2
    Internal route preference: 18
    External route preference: 165
    Prefix export count: 0
    Wide metrics are enabled, Narrow metrics are enabled

Release Information

Command introduced in Junos OS Release 8.5.

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