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show isis route download priority



Display the routes in the IS-IS routing table in the sequence of set priority. IS-IS routes set with a high priority are displayed first followed by medium and low priority prefixes. Internet Service Providers (ISP) can configure route priority to ensure faster convergence for important customers.

Configure a routing policy to assign a priority to IS-IS routes. These routes are updated in the routing table in the order of their priority. In the event of an IS-IS topology change, high priority prefixes are updated in the routing table first followed by medium and then low priority prefixes.



Display all routes in the IS-IS routing table in order of their priority for all supported address families for all routing instances.


(Optional) Destination address for the route for which you want to display the priority.

floodgroup floodgroup

(Optional) Display the priority of routes that belong to a specific floodgroup.

inet | inet6

(Optional) Display IS-IS route priority for inet (IPv4) or inet6 (IPv6) routes, respectively.

instance instance-name

(Optional) Display route priority for the specified routing instance only.


(Optional) Display the priority of Connectionless Network Service (CLNS) routes.

nexthop interface | neighbor

Display the priority of routes reachable through a specific next hop.

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

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

topology (ipv4-multicast | ipv6-multicast | ipv6-unicast | unicast)

(Optional) Display routes in order of the set priority for the specified topology only, or use unicast to display information, if available, for both IPv4 and IPv6 unicast topologies.

Required Privilege Level


Output Fields

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

Table 1: show isis route Output Fields

Field Name

Field Description

Current version

Number of the current version of the IS-IS routing table.


Version of Level 1 SPF that was run.


Version of Level 2 SPF that was run.

Prefix or Label

Destination of the route.


IS-IS level:

  • 1—Level 1 only

  • 2—Level 2 only

  • 3—Level 1 and Level 2


Version of SPF that generated the route.


Metric value associated with the route.


Metric type: int (internal) or ext (external).


Interface to the next hop.


System identifier of the next hop, displayed as a name if possible.


Next hop address type: IPv4, IPv6, or MPLS.

Backup Score

Count of available backup paths.

Sample Output

show isis route download-priority

Release Information

Command introduced in Junos OS Release 17.1.