Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?


show isis adjacency


Syntax (EX Series Switches and QFX Series)


Display information about IS-IS neighbors.



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

system id

(Optional) Display information about IS-IS neighbors for the specified intermediate system.

brief | detail | extensive

(Optional) Display standard information about IS-IS neighbors with the specified level of output.

instance instance-name

(Optional) Display information about IS-IS neighbors for the specified routing instance.

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

(Optional) Display information about IS-IS neighbors for all logical systems or for a particular logical system.

Required Privilege Level


Output Fields

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

Table 1: show isis adjacency Output Fields

Field Name

Field Description

Level of Output


Interface through which the neighbor is reachable.

All levels


System identifier (sysid), displayed as a name, if possible.


L or 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.

All levels


State of the adjacency: Up, Down, New, One-way, Initializing, or Rejected.

All levels

Hold (secs)

Remaining hold time of the adjacency.



Subnetwork point of attachment (MAC address of the next hop).


Expires in

How long until the adjacency expires, in seconds.



Priority to become the designated intermediate system.

detail extensive

Up/Down transitions

Count of adjacency status changes from Up to Down or from Down to Up.


Last transition

Time of the last Up/Down transition.


Circuit type

Bit mask of levels on this interface: 1=Level 1 router; 2=Level 2 router; 3=both Level 1 and Level 2 router.



Protocols supported by this neighbor.

detail extensive

MAC address

MAC address of the interface.

detail extensive


Supported topologies.

detail extensive

Restart capable

Whether a neighbor is capable of graceful restart: Yes or No.

detail extensive

Adjacency advertisement: Advertise

This routing device has signaled to advertise this interface to its neighbors in their link-state PDUs.

detail extensive

Adjacency advertisement: Suppress

This neighbor has signaled not to advertise the interface in the routing device's outbound link-state PDUs.

detail extensive

IP addresses

IP address of this neighbor.

detail extensive

IPV6 Address

IPv6 address of the neighbor.

detail extensive

Level 1 IPv4 Adj-SID

Level 1 IPv4 node-SID of the adjacent neighbor.

detail extensive

Level 1 IPv6 Adj-SID

Level 1 IPv6 node-SID of the adjacent neighbor.

Level 2 IPv4 Adj-SID

Level 2 IPv4 node-SID of the adjacent neighbor.

detail extensive

Level 2 IPv6 Adj-SID

Level 2 IPv6 node-SID of the adjacent neighbor.

detail extensive


Segment routing capability is enabled on the device.



Function for SRv6 adjacency.



End-X-SID function can have the following flavors:

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

  • USD— Ultimate segment pop of the SRH.

  • USP— Ultimate segment decapsulation of the SRH.


Transition log

List of recent transitions, including:

  • When—Time at which an IS-IS adjacency transition occurred.

  • State—Current state of the IS-IS adjacency (up, down, or rejected).

    • Up—Adjacency is up and operational.

    • Down—Adjacency is down and not available.

    • Rejected—Adjacency has been rejected.

  • Event—Type of transition that occurred.

    • Seenself—Possible routing loop has been detected.

    • Interface down—IS-IS interface has gone down and is no longer available.

    • Error—Adjacency error.

  • Down reason—Reason that an IS-IS adjacency is down:

    • 3-Way Handshake Failed—Connection establishment failed.

    • Address Mismatch—Address mismatch caused link failure.

    • Aged Out—Link expired.

    • ISO Area Mismatch—IS-IS area mismatch caused link failure.

    • Bad Hello—Unacceptable hello message caused link failure.

    • BFD Session Down—Bidirectional failure detection caused link failure.

    • Interface Disabled—IS-IS interface is disabled.

    • Interface Down—IS-IS interface is unavailable.

    • Interface Level Disabled—IS-IS level is disabled.

    • Level Changed—IS-IS level has changed on the adjacency.

    • Level Mismatch—Levels on adjacency are not compatible.

    • MPLS LSP Down—Label-switched path (LSP) is unavailable.

    • MT Topology Changed—IS-IS topology has changed.

    • MT Topology Mismatch—IS-IS topology is mismatched.

    • Remote System ID Changed—Adjacency peer system ID changed.

    • Protocol Shutdown—IS-IS protocol is disabled.

    • CLI Command—Adjacency brought down by user.

    • Unknown—Unknown.


Sample Output

show isis adjacency

show isis adjacency brief

The output for the show isis adjacency brief command is identical to that for the show isis adjacency command. For sample output, see show isis adjacency.

show isis adjacency detail

show isis adjacency extensive


Release Information

Command introduced before Junos OS Release 7.4.