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show isis purge log



Displays the purge log history received from adjacent devices. The purge log can include the type, length and value (TLV) details and the Intermediate System (IS) identification. Use this command to identify the purge originator and view other details of recent purges. You can display the last 50 entries in the IS-IS purge log and filter the log history based on the IS-IS level or by routing instance.



Display purge log of all routing instances.

instance instance-name

(Optional) Display purge log of the specified routing instance.

level level

(Optional) Display purge log of IS-IS routers that belong to the specified level.

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

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

Required Privilege Level


Output Fields

Table 1 describes the output fields for the show isis purge log command. Output fields are listed in the approximate order in which they appear.

Table 1: show isis purge log Output Fields

Field Name

Field Description

IS-IS Level


  • 1—Level 1 only

  • 2—Level 2 only

  • 3—Level 1 and Level 2

An exclamation point (!) preceding the level number indicates that the adjacency is missing an IP address.


Date and time in hours, minutes, and seconds when the purge occurred.

LSP Name

Name of the LSP where the purge occurred


Source of the purge


Router that received the purge instruction

Sample Output

show isis purge log

Release Information

Command introduced in Junos OS Release 16.2R1.