IS-IS Operational Commands

IS-IS Show Commands

The IS-IS show commands provide detailed information about the IS-IS protocol operation and IS-IS routes.

IS-IS Overview

Syntax:

show isis overview

Option Description

-

Without any option, this command displays a summary of all the IS-IS instances

Example: Summary view of all the IS-IS instances

supervisor@rtbrick>spine1: op> show isis overview
Instance: default
  System ID: 1921.6800.1001
  System hostname: isr1
  Areas: 49.0001/24
  Neighbor hold time: 30 sec
  LSP life time: 65535 sec
  Overload bit set: False
  SRGB base: 1000
  SRGB range: 1000
  SRGB label values: 1000 - 1999
  SRLB base: 2000
  SRLB range: 1000
  SRLB label values: 2000 - 2999
  Authentication: Level 1: md5, Level 2: md5

IS-IS Interface

Syntax:

show isis interface <option>

Option Description

-

Without any option, this command displays a summary of all the IS-IS interfaces

instance

Displays IS-IS interface information for an instance

statistics

Displays IS-IS interface statistics information

detail

Displays detailed output for all interfaces.

Example 1: Summary view of the IS-IS interfaces

supervisor@rtbrick>spine1: op> show isis interface
Instance: default
  Interface      Level   Adjacencies    Metric     Type            Passive  LDP-sync
  lo-0/0/0/0         1             0    1000000    loopback              1  -
  lo-0/0/0/0         2             0    1000000    loopback              1  -
  ifl-0/0/2/0        2             1    1000000    point-to-point        0  -
  ifl-0/0/2/1        1             2    1000000    broadcast             0  -
  ifl-0/0/2/1        2             2    1000000    broadcast             0  -
cli

Example 2: Summary view of the IS-IS interfaces for a specific instance

supervisor@rtbrick>spine1: op> show isis interface instance default
Instance: default
  Interface      Level   Adjacencies  Metric     Type            Passive  LDP-sync
  lo-0/0/0/0         1             0  1000000    loopback              1  -
  lo-0/0/0/0         2             0  1000000    loopback              1  -
  ifl-0/0/2/0        2             1  1000000    point-to-point        0  -
  ifl-0/0/2/1        1             2  1000000    broadcast             0  -
  ifl-0/0/2/1        2             2  1000000    broadcast             0  -
cli

Example 3: Summary view of the IS-IS interfaces for a specific interface

supervisor@rtbrick>spine1: op> show isis interface ifl-0/0/2/0
Instance: default
  Interface: ifl-0/0/2/0, Level: 1
    Type: point-to-point, Passive: False
    Metric: 1000000
    Hello interval: 10 seconds, Hello multiplier: 3, Hold time: 30 seconds
    Adjacencies: 1
    CNSP in: 0, CNSP out: 2446, CNSP success: 1222, CNSP fail: 0
    PSNP in: 0, PSNP out: 0, PSNP success: 0, PSNP fail: 0
    LSP in: 0, LSP out: 0, LSP success: 0, LSP fail: 0, LSP in purge: 0 LSP in auth fail: 0
    IIH in: 1134, IIH out: 1138
  Interface: ifl-0/0/2/0, Level: 2
    Type: point-to-point, Passive: False
    Metric: 1000000
    Hello interval: 10 seconds, Hello multiplier: 3, Hold time: 30 seconds
    Adjacencies: 1
    CNSP in: 0, CNSP out: 2446, CNSP success: 1222, CNSP fail: 0
    PSNP in: 0, PSNP out: 0, PSNP success: 0, PSNP fail: 0
    LSP in: 0, LSP out: 0, LSP success: 0, LSP fail: 0, LSP in purge: 0 LSP in auth fail: 0
    IIH in: 1134, IIH out: 1138
cli

Example 4: Summary view of the IS-IS interface statistics

supervisor@rtbrick>spine1: op> show isis interface statistics
Instance: default
  Interface        Level  CSNP In  CSNP Out  CSNP Fail  PSNP In  PSNP Out  PSNP Fail  LSP In  LSP Out  LSP Fail  IIH In
 IIH Out
  lo-0/0/0/0           1        0         0          0        0         0          0       0        0         0       0
       0
  lo-0/0/0/0           2        0         0          0        0         0          0       0        0         0       0        0
  ifl-0/0/2/0      	   1        0      2454          0        0         0          0       0        0         0    1138
    1142
  ifl-0/0/2/0          2        0      2454          0        0         0          0       0        0         0    1138
    1142
  ifl-0/0/2/1       1        0         0          0        0         0          0       3        1         0    2288
    2285
  ifl-0/0/2/1          2        0         0          0        0         0          0       4        1         0    2288     2285
cli

Example 5: Detailed output of the IS-IS interface

supervisor@rtbrick>spine1: op> show isis interface detail
Instance: default
  Interface: lo-0/0/0/0, Level: 1
    Type: loopback, Passive: True
    Metric: 1000000
    Hello interval: 10 seconds, Hello multiplier: 3, Hold time: 30 seconds
    Adjacencies: 0
    CNSP in: 0, CNSP out: 0, CNSP success: 0, CNSP fail: 0
    PSNP in: 0, PSNP out: 0, PSNP success: 0, PSNP fail: 0
    LSP in: 0, LSP out: 0, LSP success: 0, LSP fail: 0, LSP in purge: 0 LSP in auth fail: 0
    IIH in: 0, IIH out: 0
  Interface: lo-0/0/0/0, Level: 2
    Type: loopback, Passive: True
    Metric: 1000000
    Hello interval: 10 seconds, Hello multiplier: 3, Hold time: 30 seconds
    Adjacencies: 0
    CNSP in: 0, CNSP out: 0, CNSP success: 0, CNSP fail: 0
    PSNP in: 0, PSNP out: 0, PSNP success: 0, PSNP fail: 0
    LSP in: 0, LSP out: 0, LSP success: 0, LSP fail: 0, LSP in purge: 0 LSP in auth fail: 0
    IIH in: 0, IIH out: 0
Instance: default
  Interface: ifl-0/0/2/0, Level: 1
    Type: point-to-point, Passive: False
    Metric: 1000000
    Hello interval: 10 seconds, Hello multiplier: 3, Hold time: 30 seconds
    Adjacencies: 1
    CNSP in: 0, CNSP out: 2460, CNSP success: 1229, CNSP fail: 0
    PSNP in: 0, PSNP out: 0, PSNP success: 0, PSNP fail: 0
    LSP in: 0, LSP out: 0, LSP success: 0, LSP fail: 0, LSP in purge: 0 LSP in auth fail: 0
    IIH in: 1141, IIH out: 1145
  Interface: ifl-0/0/2/0, Level: 2
    Type: point-to-point, Passive: False
    Metric: 1000000
    Hello interval: 10 seconds, Hello multiplier: 3, Hold time: 30 seconds
    Adjacencies: 1
    CNSP in: 0, CNSP out: 2460, CNSP success: 1229, CNSP fail: 0
    PSNP in: 0, PSNP out: 0, PSNP success: 0, PSNP fail: 0
    LSP in: 0, LSP out: 0, LSP success: 0, LSP fail: 0, LSP in purge: 0 LSP in auth fail: 0
    IIH in: 1141, IIH out: 1145
 <...>
cli

Example 5: Detailed output of an IS-IS interface that supports broadcast

supervisor@rtbrick>spine1: op> show isis interface ifl-0/0/2/1
Instance: default
  Interface: ifl-0/0/2/1, Level: 1
    Type: broadcast, Passive: False, Circuit ID: 0x1
    Metric: 1000000, Priority: 64
    Hello interval: 10 seconds, Hello multiplier: 3, Hold time: 30 seconds
    Designated IS: isr6.01(1921.6800.1006.01)
    Adjacencies: 2
    CNSP in: 0, CNSP out: 0, CNSP success: 1238, CNSP fail: 0
    PSNP in: 0, PSNP out: 0, PSNP success: 0, PSNP fail: 0
    LSP in: 3, LSP out: 1, LSP success: 3, LSP fail: 0, LSP in purge: 0 LSP in auth fail: 0
    IIH in: 2304, IIH out: 2301
  Interface: ifl-0/0/2/1, Level: 2
    Type: broadcast, Passive: False, Circuit ID: 0x1
    Metric: 1000000, Priority: 64
    Hello interval: 10 seconds, Hello multiplier: 3, Hold time: 30 seconds
    Designated IS: isr6.01(1921.6800.1006.01)
    Adjacencies: 2
    CNSP in: 0, CNSP out: 0, CNSP success: 1238, CNSP fail: 0
    PSNP in: 0, PSNP out: 0, PSNP success: 0, PSNP fail: 0
    LSP in: 4, LSP out: 1, LSP success: 4, LSP fail: 0, LSP in purge: 0 LSP in auth fail: 0
    IIH in: 2304, IIH out: 2301
supervisor@rtbrick>spine1: op>
cli

IS-IS Neighbor

Syntax:

show isis neighbor <option>

Option Description

-

Without any option, this command displays a summary of all the IS-IS neighbors

detail

Displays detailed information for IS-IS neighbor

instance

Displays IS-IS neighbor information for an instance

Example 1: Summary view of the IS-IS neighbor

supervisor@rtbrick>spine1: op> show isis neighbor
Instance: default
  Interface        System       Level   State   Type       Up since                Expires
  ifl-0/0/2/0   	 isr6         L1L2    Up      P2P        Thu Jul 25 05:40:05     in 18s 750197us
  ifl-0/0/2/1    	 isr6         L1      Up      Broadcast  Thu Jul 25 05:39:58     in 26s 728457us
  ifl-0/0/2/1    	 isr6         L2      Up      Broadcast  Thu Jul 25 05:39:58     in 29s 729531us
cli

Example 2: Detailed view of the IS-IS neighbor

supervisor@S1-STD-17-1703: cfg> show isis neighbor detail
Instance: default
  System: isr6, Interface: ifl-0/0/2/0
    State: Up, Level: L1L2, Adjacency type: P2P
    Hold time: 30.0s, Expiry time: in 29s 780091us
    Local IPv4 address: 16.0.1.1, Remote IPv4 address: 16.0.1.6
    Local IPv6 address: fe80::7807:2dff:fec0:2, Remote IPv6 address: fe80::7847:eff:fec0:0
    Up since: Thu Jul 25 05:40:05 GMT +0000 2024, Last down reason: NA
    Last transition: 2024-07-25T05:40:05.778348+0000, Number of transitions: 2
    Error counters:
      Level mismatch: 0, Area mismatch: 0, System ID: 0, Subnet mismatch: 0
      Hold timeout: 0, Neighbor down: 0, Interface down: 0, Admin reset: 0
      Interface configuration: 0, Area configuration: 0, Other: 0
  System: isr6, Interface: ifl-0/0/2/1
    State: Up, Level: L1L2, Adjacency type: Broadcast
    Hold time: 30.0s, Expiry time: in 24s 779280us
    Priority: 64, Designated IS: 1921.6800.1006.01, SNPA: 7a:47:0e:c0:00:00
    Local IPv4 address: 16.0.2.1, Remote IPv4 address: 16.0.2.6
    Local IPv6 address: fe80::7807:2d00:1c0:2, Remote IPv6 address: fe80::7847:e00:1c0:0
    Up since: Thu Jul 25 05:39:58 GMT +0000 2024, Last down reason: NA
    Last transition: 2024-07-25T05:39:58.725007+0000, Number of transitions: 3
    Error counters:
      Level mismatch: 0, Area mismatch: 0, System ID: 0, Subnet mismatch: 0
      Hold timeout: 0, Neighbor down: 0, Interface down: 0, Admin reset: 0
      Interface configuration: 0, Area configuration: 0, Other: 0
<...>
cli

Example 3: Summary view of the IS-IS neighbor for the specified instance

supervisor@rtbrick>spine1: op> show isis neighbor instance default
Instance: default
  Interface      System      Level   State   Type       Up since               Expires
  ifl-0/0/2/0    isr6        L1L2    Up      P2P        Thu Jul 25 05:40:05    in 21s 893028us
  ifl-0/0/2/1    isr6        L1      Up      Broadcast  Thu Jul 25 05:39:58    in 26s 848320us
  ifl-0/0/2/1    isr6        L2      Up      Broadcast  Thu Jul 25 05:39:58    in 24s 845934us
supervisor@rtbrick>spine1: op>
cli

Example 4: Detailed view of the IS-IS neighbor for the specified instance

supervisor@rtbrick>spine1: op> show isis neighbor instance default detail
Instance: default
  System: isr6, Interface: ifl-0/0/2/0
    State: Up, Level: L1L2, Adjacency type: P2P
    Hold time: 30.0s, Expiry time: in 21s 155501us
    Local IPv4 address: 16.0.1.1, Remote IPv4 address: 16.0.1.6
    Local IPv6 address: fe80::7807:2dff:fec0:2, Remote IPv6 address: fe80::7847:eff:fec0:0
    Up since: Thu Jul 25 05:40:05 GMT +0000 2024, Last down reason: NA
    Last transition: 2024-07-25T05:40:05.778348+0000, Number of transitions: 2
    Error counters:
      Level mismatch: 0, Area mismatch: 0, System ID: 0, Subnet mismatch: 0
      Hold timeout: 0, Neighbor down: 0, Interface down: 0, Admin reset: 0
      Interface configuration: 0, Area configuration: 0, Other: 0
  System: isr6, Interface: ifl-0/0/2/1
    State: Up, Level: L1L2, Adjacency type: Broadcast
    Hold time: 30.0s, Expiry time: in 23s 150249us
    Priority: 64, Designated IS: 1921.6800.1006.01, SNPA: 7a:47:0e:c0:00:00
    Local IPv4 address: 16.0.2.1, Remote IPv4 address: 16.0.2.6
    Local IPv6 address: fe80::7807:2d00:1c0:2, Remote IPv6 address: fe80::7847:e00:1c0:0
    Up since: Thu Jul 25 05:39:58 GMT +0000 2024, Last down reason: NA
    Last transition: 2024-07-25T05:39:58.725007+0000, Number of transitions: 3
    Error counters:
      Level mismatch: 0, Area mismatch: 0, System ID: 0, Subnet mismatch: 0
      Hold timeout: 0, Neighbor down: 0, Interface down: 0, Admin reset: 0
      Interface configuration: 0, Area configuration: 0, Other: 0
 <...>
cli

Designated IS (DIS) Election History

In IS-IS broadcast networks, the Designated Intermediate System (DIS) is elected to optimize the distribution of routing information, reducing network overhead by coordinating the flooding of Link State Packets (LSPs) among multiple routers. This ensures efficient and stable network operation. The following command displays the DIS election history in RBFS.

Syntax:

show isis dis-election history <attribute> <value>

Option Description

-

Without any option, this command displays a summary of all the IS-IS.

instance

Displays DIS history information for the specified instance.

interface <interface-name>

Displays IS-IS DIS history information for the specified interface.

level [level-1/level-2]

Displays IS-IS DIS history information for the specified level.

Example: Summary view of IS-IS DIS Election History

supervisor@rtbrick>spine1: op> show isis dis-election history
Instance: default, Interface: ifl-0/0/2/1, Level: 1
Timestamp                             DIS                      Event
Thu Jul 25 05:39:58 GMT +0000 2024     -                       Neighbour 1921.6800.1006 adjacency state changed from Init to Up
Thu Jul 25 05:39:58 GMT +0000 2024    1921.6800.1006.01        Neighbour 1921.6800.1006 DIS changed from 0000.0000.0000.00 to 1921.6800.1006.01
Instance: default, Interface: ifl-0/0/2/1, Level: 2
Timestamp                             DIS                      Event
Thu Jul 25 05:39:58 GMT +0000 2024     -                       Neighbour 1921.6800.1006 adjacency state changed from Init to Up
Thu Jul 25 05:39:58 GMT +0000 2024    1921.6800.1006.01        Neighbour 1921.6800.1006 DIS changed from 0000.0000.0000.00 to 1921.6800.1006.01
cli

IS-IS Hostname

Syntax:

show isis hostname

Option Description

-

Without any option, this command displays a summary of all the IS-IS dynamic hostnames

Example: Summary view of IS-IS hostnames

supervisor@rtbrick>spine1: op> show isis hostname
Instance       System-ID           Hostname
default        1921.6800.1001      isr1
default        1921.6800.1006      isr6
default        1921.6800.1006      isr6
supervisor@rtbrick>spine1: op>
cli

IS-IS Database

Syntax:

show isis database <option>

Option Description

-

Without any option, this command displays all the IS-IS databases

detail

Displays detailed information for IS-IS database

instance

Displays IS-IS database information for an instance

lsp <lsp-id>

Displays a summary of IS-IS database for the specified LSP ID. This command includes an option for entering the system ID part either by hostname or by ID.

[level-1/level-2] lsp

Displays a summary of IS-IS database LSP information for specified level

system <system-id>

Displays a summary of IS-IS database for all LSPs from a system

[level-1/level-2] system

Displays a summary of IS-IS database for all LSPs from a system on the specified level.

[level-1/level-2] detail

Displays detailed information for the specified level

Example 1: Summary view of the IS-IS Database

supervisor@S1-STD-7-7001>bm01-tst.fsn.rtbrick.net: op> show isis database
Instance: default, Level: 1
  LSP ID                    Sequence     Checksum     Lifetime     Overload     Attached
  isr1.00-00                     0x4       0xe035        52785            0            0
  isr6.00-00                     0x3       0xe281        52785            0            0
  isr6.01-00                     0x1       0x4b1a        52778            0            0
Instance: default, Level: 2
  LSP ID                    Sequence     Checksum     Lifetime     Overload     Attached
  isr1.00-00                     0x6       0x75af        52785            0            0
  isr6.00-00                     0x5       0x117e        52785            0            0
  isr6.01-00                     0x1       0x4b1a        52778            0            0
cli

Example 2: Summary view of the IS-IS database for the specified LSP

supervisor@rtbrick>spine1: op> show isis database lsp 1921.6800.1001.00-00
Instance: default, Level: 1
  LSP ID: isr1.00-00
    Interface:
    LSP Header:
      Sequence: 0x4
      Checksum: 0xe035
      Remaining lifetime: 65535 seconds
      Flags: Attached: 0, Overload: 0
    Packet:
      Length: 182 bytes
      Last received time: 2024-07-25T05:40:05.989755+0000
      Expiry: expires in 14h 39m 11s 284549us
    System ID: 1921.6800.1001
    Dynamic Hostname TLV (137): isr1
    Protocols Supported TLVs (129):
      Network layer protocol ID: IPv6
      Network layer protocol ID: IPv4
    Area Address TLVs (1):
      Area address: 49.0001
    IS Reachability TLVs (22):
      IS neighbor: 1921.6800.1006.00              Metric:  1000000
      IS neighbor: 1921.6800.1006.01              Metric:  1000000
    IPv4 Reachability TLVs (135):
      IPv4 prefix: 16.0.1.0/24                    Metric:  1000000   Internal   Up
      IPv4 prefix: 16.0.2.0/24                    Metric:  1000000   Internal   Up
      IPv4 prefix: 192.168.1.1/32                 Metric:  1000000   Internal   Up     SID:  100   Flags: Node
    IPv6 Reachability TLVs (236):
      IPv6 prefix: 16:0:1::/64                    Metric:  1000000   Internal   Up
      IPv6 prefix: 16:0:2::/64                    Metric:  1000000   Internal   Up
      IPv6 prefix: 192:168:1::1/128               Metric:  1000000   Internal   Up     SID:  102   Flags: Node
    Segment Routing TLVs (242/sub 2):
      SRGB: Base: 1000, Range: 1000, Router ID: 192.168.1.1
 <...>
cli

Example 3: Detailed view of the IS-IS database for level-1

supervisor@rtbrick>spine1: op> show isis database level-1 detail
Instance: default, Level: 1
  LSP ID: isr1.00-00
    Interface:
    LSP Header:
      Sequence: 0x4
      Checksum: 0xe035
      Remaining lifetime: 52682 seconds
      Flags: Attached: 0, Overload: 0
    Packet:
      Length: 182 bytes
      Last received time: 2024-07-25T05:40:05.989755+0000
      Expiry: expires in 14h 38m 2s 951316us
    System ID: 1921.6800.1001
    Dynamic Hostname TLV (137): isr1
    Protocols Supported TLVs (129):
      Network layer protocol ID: IPv6
      Network layer protocol ID: IPv4
    Area Address TLVs (1):
      Area address: 49.0001
    IS Reachability TLVs (22):
      IS neighbor: 1921.6800.1006.00              Metric:  1000000,
      IS neighbor: 1921.6800.1006.01              Metric:  1000000,
    IPv4 Reachability TLVs (135):
      IPv4 prefix: 16.0.1.0/24                    Metric:  1000000   Internal   Up
      IPv4 prefix: 16.0.2.0/24                    Metric:  1000000   Internal   Up
      IPv4 prefix: 192.168.1.1/32                 Metric:  1000000   Internal   Up     SID:  100   Flags: Node
    IPv6 Reachability TLVs (236):
      IPv6 prefix: 16:0:1::/64                    Metric:  1000000   Internal   Up
      IPv6 prefix: 16:0:2::/64                    Metric:  1000000   Internal   Up
      IPv6 prefix: 192:168:1::1/128               Metric:  1000000   Internal   Up     SID:  102   Flags: Node
    Segment Routing TLVs (242/sub 2):
      SRGB: Base: 1000, Range: 1000, Router ID: 192.168.1.1
  LSP ID: isr6.00-00
    Interface: ifl-0/0/2/1
    LSP Header:
      Sequence: 0x3
      Checksum: 0xe281
      Remaining lifetime: 52682 seconds
      Flags: Attached: 0, Overload: 0
    Packet:
      Length: 182 bytes
      Last received time: 2024-07-25T05:40:05.786957+0000
      Expiry: expires in 14h 38m 2s 748444us
    System ID: 1921.6800.1006
    Dynamic Hostname TLV (137): isr6
    Protocols Supported TLVs (129):
      Network layer protocol ID: IPv6
      Network layer protocol ID: IPv4
    Area Address TLVs (1):
      Area address: 49.0001
    IS Reachability TLVs (22):
      IS neighbor: 1921.6800.1001.00              Metric:  1000000,
      IS neighbor: 1921.6800.1006.01              Metric:  1000000,
    IPv4 Reachability TLVs (135):
      IPv4 prefix: 16.0.1.0/24                    Metric:  1000000   Internal   Up
      IPv4 prefix: 16.0.2.0/24                    Metric:  1000000   Internal   Up
      IPv4 prefix: 192.168.1.6/32                 Metric:  1000000   Internal   Up     SID:  600   Flags: Node
    IPv6 Reachability TLVs (236):
      IPv6 prefix: 16:0:1::/64                    Metric:  1000000   Internal   Up
      IPv6 prefix: 16:0:2::/64                    Metric:  1000000   Internal   Up
      IPv6 prefix: 192:168:1::6/128               Metric:  1000000   Internal   Up     SID:  601   Flags: Node
    Segment Routing TLVs (242/sub 2):
      SRGB: Base: 6000, Range: 1000, Router ID: 192.168.1.6
 <...>
cli

Example 4: Summary view of the IS-IS database for the specified instance

supervisor@rtbrick>spine1: op> show isis database instance default
Instance: default, Level: 1
  LSP ID                    Sequence     Checksum     Lifetime     Overload     Attached
  isr1.00-00                     0x4       0xe035        52625            0            0
  isr6.00-00                     0x3       0xe281        52625            0            0
  isr6.01-00                     0x1       0x4b1a        52618            0            0
Instance: default, Level: 2
  LSP ID                    Sequence     Checksum     Lifetime     Overload     Attached
  isr1.00-00                     0x6       0x75af        52625            0            0
  isr6.00-00                     0x5       0x117e        52625            0            0
  isr6.01-00                     0x1       0x4b1a        52618            0            0
cli

Example 5: Summary view of the IS-IS database for the specified instance and LSP

supervisor@rtbrick>spine1: op> show isis database instance default lsp  1921.6800.1001.00-00
Instance: default, Level: 1
  LSP ID: isr1.00-00
    Interface:
    LSP Header:
      Sequence: 0x4
      Checksum: 0xe035
      Remaining lifetime: 65535 seconds
      Flags: Attached: 0, Overload: 0
    Packet:
      Length: 182 bytes
      Last received time: 2024-07-25T05:40:05.989755+0000
      Expiry: expires in 14h 36m 35s 357028us
    System ID: 1921.6800.1001
    Dynamic Hostname TLV (137): isr1
    Protocols Supported TLVs (129):
      Network layer protocol ID: IPv6
      Network layer protocol ID: IPv4
    Area Address TLVs (1):
      Area address: 49.0001
    IS Reachability TLVs (22):
      IS neighbor: 1921.6800.1006.00              Metric:  1000000
      IS neighbor: 1921.6800.1006.01              Metric:  1000000
    IPv4 Reachability TLVs (135):
      IPv4 prefix: 16.0.1.0/24                    Metric:  1000000   Internal   Up
      IPv4 prefix: 16.0.2.0/24                    Metric:  1000000   Internal   Up
      IPv4 prefix: 192.168.1.1/32                 Metric:  1000000   Internal   Up     SID:  100   Flags: Node
    IPv6 Reachability TLVs (236):
      IPv6 prefix: 16:0:1::/64                    Metric:  1000000   Internal   Up
      IPv6 prefix: 16:0:2::/64                    Metric:  1000000   Internal   Up
      IPv6 prefix: 192:168:1::1/128               Metric:  1000000   Internal   Up     SID:  102   Flags: Node
    Segment Routing TLVs (242/sub 2):
      SRGB: Base: 1000, Range: 1000, Router ID: 192.168.1.1
 <...>
cli

IS-IS Route

Syntax:

show isis route <option>

Option Description

-

Without any option, this command displays a summary of the IS-IS route information

instance

Displays IS-IS route information for an instance

<afi> <safi>

Routing information for the specified AFI/SAFI. Supported SAFI values are 'unicast' and 'labeled-unicast'.

Example 1: Summary view of the IS-IS routes

supervisor@rtbrick>spine1: op> show isis route
Instance: default, AFI: ipv4, SAFI: unicast
  Prefix                    Level   Metric     Type         Next Hop       Interface
  16.0.1.0/24                   1   1000000    Internal     n/a            local
  16.0.2.0/24                   1   1000000    Internal     n/a            local
  192.168.1.1/32                1   1000000    Internal     n/a            local
  192.168.1.6/32                1   2000000    Internal     16.0.2.6       ifl-0/0/2/1
                                                            16.0.1.6       ifl-0/0/2/0
Instance: default, AFI: ipv4, SAFI: labeled-unicast
  Prefix                    Level   Metric     SID Index    Next Hop       Interface   Label
  192.168.1.6/32                1   2000000    600          16.0.2.6       ifl-0/0/2/1
                                                            16.0.1.6       ifl-0/0/2/0
Instance: default, AFI: ipv6, SAFI: unicast
  Prefix                    Level   Metric     Type         Next Hop       Interface
  16:0:1::/64                   1   1000000    Internal     n/a            local
  16:0:2::/64                   1   1000000    Internal     n/a            local
  192:168:1::1/128              1   1000000    Internal     n/a            local
  192:168:1::6/128              1   2000000    Internal     fe80::7847:eff:fec0:0     ifl-0/0/2/0

<...>
cli

Example 2: Summary view of the IS-IS routes for the specified instance

supervisor@rtbrick>spine1: op> show isis route instance default
Instance: default, AFI: ipv4, SAFI: unicast
  Prefix                    Level   Metric     Type         Next Hop             Interface
  16.0.1.0/24                   1   1000000    Internal     n/a                  local
  16.0.2.0/24                   1   1000000    Internal     n/a                  local
  192.168.1.1/32                1   1000000    Internal     n/a                  local
  192.168.1.6/32                1   2000000    Internal     16.0.2.6             ifl-0/0/2/1
                                                            16.0.1.6             ifl-0/0/2/0
Instance: default, AFI: ipv4, SAFI: labeled-unicast
  Prefix                    Level   Metric     SID Index    Next Hop             Interface   Label
  192.168.1.6/32                1   2000000    600          16.0.2.6             ifl-0/0/2/1
                                                            16.0.1.6             ifl-0/0/2/0
Instance: default, AFI: ipv6, SAFI: unicast
  Prefix                    Level   Metric     Type         Next Hop     	      Interface
  16:0:1::/64                   1   1000000    Internal     n/a                   local
  16:0:2::/64                   1   1000000    Internal     n/a                   local
  192:168:1::1/128              1   1000000    Internal     n/a                   local
  192:168:1::6/128              1   2000000    Internal     fe80::7847:eff:fec0:0 ifl-0/0/2/0
                                                            fe80::7847:e00:1c0:0  ifl-0/0/2/1
<...>
cli

Example 3: Summary view of the IS-IS routes for the specified instance and address family (IPv4 unicast).

supervisor@rtbrick>spine1: op> show isis route instance default ipv4 unicast
Instance: default, AFI: ipv4, SAFI: unicast
  Prefix             Level   Metric     Type         Next Hop   Interface
  16.0.1.0/24            1   1000000    Internal     n/a        local
  16.0.2.0/24            1   1000000    Internal     n/a        local
  192.168.1.1/32         1   1000000    Internal     n/a        local
  192.168.1.6/32             2000000    Internal     16.0.2.6   ifl-0/0/2/1
  													 16.0.1.6   ifl-0/0/2/0
cli

Example 4: Summary view of the IS-IS routes for the specified instance and address family (IPv4 labeled-unicast).

supervisor@rtbrick>spine1: op> show isis route instance default ipv4 labeled-unicast
Instance: default, AFI: ipv4, SAFI: labeled-unicast
  Prefix        Level   Metric     SID Index    Next Hop        Interface   Label
  192.168.1.6/32    1   2000000    600          16.0.2.6        ifl-0/0/2/1
												16.0.1.6        ifl-0/0/2/0
cli

Example 5: Summary view of the IS-IS routes for the specified instance and address family (IPv6 unicast).

supervisor@rtbrick>spine1: op> show isis route instance default ipv6 unicast
Instance: default, AFI: ipv6, SAFI: unicast
  Prefix             Level   Metric     Type         Next Hop                Interface
  16:0:1::/64            1   1000000    Internal     n/a                     local
  16:0:2::/64            1   1000000    Internal     n/a                     local
  192:168:1::1/128       1   1000000    Internal     n/a                     local
  192:168:1::6/128       1   2000000    Internal     fe80::7847:eff:fec0:0   ifl-0/0/2/0
                                                     fe80::7847:e00:1c0:0    ifl-0/0/2/1
cli

IS-IS Segment Routing

Syntax:

show isis segment-routing <option>

Option Description

global-block

Displays Segment routing global block (SRGB) information

global-block instance <instance>

Displays Segment routing global block (SRGB) information for the specified instance

label-binding

Displays the IS-IS segment routing label bindings information

label-binding instance <instance>

Displays the IS-IS segment routing label bindings for the specified instance

prefix-segment

Displays the IS-IS prefix segments information

prefix-segment <instance>

Displays the IS-IS prefix segments for the specified instance

adjacency-segment

Displays the IS-IS segment routing adjacency SIDs

Example 1: Summary view of the IS-IS segment routing global block

supervisor@rtbrick>spine1: op> show isis segment-routing global-block
Instance: default, Level: 1
  System                    SRGB Base   SRGB Range
  isr1                           1000         1000
  isr6                           6000         1000
Instance: default, Level: 2
  System                    SRGB Base   SRGB Range
  isr1                           1000         1000
  isr6                           6000         1000
cli

Example 2: Summary view of the IS-IS segment routing label binding

supervisor@rtbrick>spine1: op> show isis segment-routing label-binding
Instance: default, Level: 1
  System        Prefix                  Range   SID     Flags
Instance: default, Level: 2
  System        refix                   Range   SID     Flags
cli

Example 3: Summary view of the IS-IS segment routing prefix segment

supervisor@rtbrick>spine1: op> show isis segment-routing prefix-segment
Instance: default, Level: 1
  System                    Prefix                    SID     Flags
  isr1                      192.168.1.1/32              100   Node
  isr1                      192:168:1::1/128            102   Node
  isr6                      192.168.1.6/32              600   Node
  isr6                      192:168:1::6/128            601   Node
Instance: default, Level: 2
  System                    Prefix                     SID     Flags
  isr1                      192.168.1.1/32               100   Node
  isr1                      192.168.1.6/32               600   Re-advertisement, Node
  isr1                      192:168:1::1/128             102   Node
  isr1                      192:168:1::6/128             601   Re-advertisement, Node
  isr6                      192.168.1.1/32               100   Re-advertisement, Node
  isr6                      192.168.1.6/32               600   Node
  isr6                      192:168:1::1/128             102   Re-advertisement, Node
  isr6                      192:168:1::6/128             601   Node
cli

Example 4: Summary view of the IS-IS segment routing adjacency-segment

supervisor@S1-STD-17-1703: cfg> show isis segment-routing adjacency-segment
Instance: default, Level: 1, No adjacency-segments
Instance: default, Level: 2, No adjacency-segments
cli

IS-IS SPF

Syntax:

show isis spf <option>

Option Description

result

Displays a summary of the IS-IS SPF results

result <instance>

Displays a summary of the IS-IS SPF results for the specified instance

result [level-1/level2]

Displays a summary of the IS-IS SPF results for the specified level.

Example 1: Summary view of the IS-IS SPF result

supervisor@rtbrick>spine1: op> show isis spf result
Instance: default, Level: 1
  Destination Node          Metric     Neighbor Node         Interface       Nexthop   Address
  1921.6800.1001.00                0                         local
  1921.6800.1006.00          1000000   1921.6800.1006.00     ifl-0/0/2/0     IPv6      fe80::7847:eff:fec0:0
                                       1921.6800.1006.00     ifl-0/0/2/1     IPv6      fe80::7847:e00:1c0:0
                                       1921.6800.1006.00     ifl-0/0/2/0     IPv4      16.0.1.6
                                       1921.6800.1006.00     ifl-0/0/2/1     IPv4      16.0.2.6
  1921.6800.1006.01          1000000                           local
Instance: default, Level: 2
  Destination Node          Metric     Neighbor Node         Interface         Nexthop   Address
  1921.6800.1001.00                0                           local
  1921.6800.1006.00          1000000   1921.6800.1006.00     ifl-0/0/2/0      IPv6      fe80::7847:eff:fec0:0
                                       1921.6800.1006.00     ifl-0/0/2/1      IPv6      fe80::7847:e00:1c0:0
                                       1921.6800.1006.00     ifl-0/0/2/0      IPv4      16.0.1.6
                                       1921.6800.1006.00     ifl-0/0/2/1      IPv4      16.0.2.6
  1921.6800.1006.01          1000000                           local
cli

Example 2: Summary view of the IS-IS SPF result for level-1

supervisor@rtbrick>spine1: op> show isis spf result level-1
Instance: default, Level: 1
  Destination Node          Metric       Neighbor Node         Interface         Nexthop   Address
  1921.6800.1001.00                0                           local
  1921.6800.1006.00          1000000     1921.6800.1006.00     ifl-0/0/2/0    IPv6      fe80::7847:eff:fec0:0
                                         1921.6800.1006.00     ifl-0/0/2/1    IPv6      fe80::7847:e00:1c0:0
                                         1921.6800.1006.00     ifl-0/0/2/0    IPv4      16.0.1.6
                                         1921.6800.1006.00     ifl-0/0/2/1    IPv4      16.0.2.6
  1921.6800.1006.01          1000000                           local
cli

Example 3: Summary view of the IS-IS SPF result for level-2

supervisor@rtbrick>spine1: op> show isis spf result level-2
Instance: default, Level: 2
  Destination Node          Metric       Neighbor Node         Interface         Nexthop   Address
  1921.6800.1001.00                0                           local
  1921.6800.1006.00          1000000     1921.6800.1006.00     ifl-0/0/2/0       IPv6      fe80::7847:eff:fec0:0
                                         1921.6800.1006.00     ifl-0/0/2/1       IPv6      fe80::7847:e00:1c0:0
                                         1921.6800.1006.00     ifl-0/0/2/0       IPv4      16.0.1.6
                                         1921.6800.1006.00     ifl-0/0/2/1    IPv4      16.0.2.6
  1921.6800.1006.01          1000000                           local
cli

Example 4: Summary view of the IS-IS SPF result of a specific instance for level-1

supervisor@rtbrick>spine1: op> show isis spf result instance default level-1
Instance: default, Level: 1
  Destination Node          Metric       Neighbor Node         Interface         Nexthop   Address
  1921.6800.1001.00                0                           local
  1921.6800.1006.00          1000000     1921.6800.1006.00     ifl-0/0/2/0       IPv6      fe80::7847:eff:fec0:0
                                         1921.6800.1006.00     ifl-0/0/2/1       IPv6      fe80::7847:e00:1c0:0
                                         1921.6800.1006.00     ifl-0/0/2/0       IPv4      16.0.1.6
                                         1921.6800.1006.00     ifl-0/0/2/1       IPv4      16.0.2.6
  1921.6800.1006.01          1000000                           local
cli

Example 5: Summary view of the IS-IS SPF result of a specific instance for level-2

supervisor@rtbrick>spine1: op> show isis spf result instance default level-2
Instance: default, Level: 2
  Destination Node          Metric       Neighbor Node         Interface         Nexthop   Address
  1921.6800.1001.00                0                           local
  1921.6800.1006.00          1000000     1921.6800.1006.00     ifl-0/0/2/0       IPv6      fe80::7847:eff:fec0:0
                                         1921.6800.1006.00     ifl-0/0/2/1       IPv6      fe80::7847:e00:1c0:0
                                         1921.6800.1006.00     ifl-0/0/2/0       IPv4      16.0.1.6
                                         1921.6800.1006.00     ifl-0/0/2/1       IPv4      16.0.2.6
  1921.6800.1006.01          1000000                           local
cli

IS-IS Clear Commands

Clear commands allow to reset operational states.

IS-IS Interface

Syntax:

clear isis interface <option> …​

Option Description

statistics

Clears the statistics of all IS-IS interfaces.

Example: The example below shows how to clear IS-IS interface statistics.

supervisor@rtbrick>spine1: op> clear isis interface statistics
cli

IS-IS Neighbor

Syntax:

clear isis neighbor <option> …​

Option Description

neighbor

Clears neighbors of the default instance

neighbor instance <instance_name>

Clears neighbors of the specified instance

neighbor instance <instance_name> interface <interface-name>

Clears the specified interface of a specified neighbor instance

Example: The example below shows how to clear neighbors of the specified instance

supervisor@rtbrick>spine1: op> clear isis neighbor instance default
cli

IS-IS Database

Syntax:

clear isis database <option> …​

Option Description

Instance

Clears neighbors of the default instance

level-1

Clears area level-1

level-2

Clears area level-2

lsp

Clears IS-IS database for the specific LSP ID

System

Clears the LSDB system ID

Example: The example below shows how to clear the database instance

supervisor@rtbrick>spine1: op> clear isis database instance default
cli

The LSDB data is cleared for instance default