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: 1921.6800.1002
  System hostname: No hostname configured
  Areas: 49.0001/24
  Neighbor hold time: 30 sec
  LSP life time: 65535 se
  Overload bit set: False
  SRGB base: not defined
  SRGB range: not defined
  SRGB label values: not defined
  SRLB base: not defined
  SRLB range: not defined
  SRLB label values: not defined
  Authentication: Level 1: none, Level 2: none

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.

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
  lo-0/0/4/1          1         	0	1000000     loopback         	    True
  ifl-0/1/2/12        1         	0	1000000     point-to-point   	    False
  ifl-0/1/6/16        1          	0	1000000     point-to-point      	False

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
  lo-0/0/4/1           	1         	0	  1000000   loopback         	True
  ifl-0/1/2/12       	1         	0	  1000000   point-to-point   	False
  ifl-0/1/6/16       	1         	0	  1000000   point-to-point   	False

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

supervisor@rtbrick>spine1: op> show isis interface ifl-0/1/6/16
Instance: default
  Interface: ifl-0/1/6/16, Level: 1
	Type: point-to-point, Passive: False
	Metric: 1000000
	Adjacencies: 1
	CNSP: In: 24 Out: 34 Success: 24 Fail: 0
	PSNP: In: 8 Out: 10 Success: 5 Fail: 1
	LSP:  In: 14 Out: 11 Success: 11 Fail: 2 In Purge: 0 In Auth Fail: 2
	IIH:  In: 121 Out: 163

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-0/0/4/1       	1    	0     	0      	0    	0     	0      	0   	0    	0     	0   	0    	0
  ifl-0/1/2/12   	1   	32    	32      	0    	9     	6      	1   	9   	10     	0 	117  	138
  ifl-0/1/6/16   	1   	22    	32      	0    	6     	6      	1   	9    	8     	0 	115  	138

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
    Adjacencies: 0
    CNSP: In: 0 Out: 0 Success: 0 Fail: 0
    PSNP: In: 0 Out: 0 Success: 0 Fail: 0
    LSP:  In: 0 Out: 0 Success: 0 Fail: 0 In Purge: 0 In Auth Fail: 0
    IIH:  In: 0 Out: 0
Instance: default
  Interface: ifl-0/0/0/0, Level: 1
    Type: point-to-point, Passive: False
    Metric: 1000000
    Adjacencies: 1
    CNSP: In: 3020 Out: 3020 Success: 3020 Fail: 0
    PSNP: In: 2 Out: 2 Success: 2 Fail: 0
    LSP:  In: 2 Out: 2 Success: 2 Fail: 0 In Purge: 0 In Auth Fail: 0
    IIH:  In: 5589 Out: 5600

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

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-0/1/2/12 	1920.0100.4002.00  L1  	Up  	P2P 	Mon Nov 02 06:18:36 	in 28s 228094us
  ifl-0/1/6/16 	1920.0000.0006.00  L1  	Up  	P2P 	Mon Nov 02 06:18:30 	in 24s 420225us

Example 2: Detailed view of the IS-IS neighbor

supervisor@S1-STD-17-1703: cfg> show isis neighbor detail
Instance: ip2vrf
  System: isr6, Interface: ifl-0/0/2/0
    State: Up, Level: L1, Adjacency type: P2P
    Holding time: 30.0s, Expiry time: in 25s 332949us
    Local IPv4 address: 198.51.100.27, Remote IPv4 address: 198.51.100.28
    Local IPv6 address: 2001:db8:0:76::, Remote IPv6 address: 2001:db8:0:34::
    IPv4 Adjacency SID: 11116, IPv6 Adjacency SID: 11117
    Up since: Wed Feb 16 04:46:25 GMT +0000 2022, Last down reason: Admin reset
    Last transition: 2022-02-16T04:46:25.300144+0000, Number of transitions: 14
    Error counters:
      Level mismatch: 0, Area mismatch: 0, System ID: 0, Subnet mismatch: 0
      Hold timeout: 3, Neighbor down: 0, Interface down: 0, Admin reset: 1
      Interface configuration: 0, Area configuration: 0, Other: 0

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-0/1/2/12 	1920.0100.4002.00  L1  	Up  	P2P 	Mon Nov 02 06:18:36 	in 28s 678329us
  ifl-0/1/6/16 	1920.0000.0006.00  L1  	Up  	P2P 	Mon Nov 02 06:18:30 	in 28s 88085us
supervisor@rtbrick>spine1: op>

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: 1920.0100.4002.00, Interface: ifl-0/1/2/12
	State: Up, Level: L1, Adjacency type: P2P
	Holding time: 30.0s, Expiry time: in 21s 706586us
	Local IPv4 address: 198.51.100.22, Remote IPv4 address: 198.51.100.21
	Local IPv6 address: 2001:db8:0:110::, Remote IPv6 address: 2001:db8:0:3433::
	Up since: Mon Nov 02 06:18:36 GMT +0000 2020, Last down reason: NA
	Last transition: 2020-11-02T06:18:36.947601+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: 1920.0000.0006.00, Interface: ifl-0/1/6/16
	State: Up, Level: L1, Adjacency type: P2P
	Holding time: 30.0s, Expiry time: in 22s 832756us
	Local IPv4 address: 198.51.100.100, Remote IPv4 address: 198.51.100.101
	Local IPv6 address: 2001:db8:0:10::, Remote IPv6 address: 2001:db8:0:6843::
	Up since: Mon Nov 02 06:18:30 GMT +0000 2020, Last down reason: NA
	Last transition: 2020-11-02T06:18:30.356111+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

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     	1920.0100.4001  	spine1
supervisor@rtbrick>spine1: op>

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

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
  1921.6800.1002.00-00           0x3          0x9561         65535            0            0
  1921.6800.1005.00-00           0x2          0x499b         65535            0            0
Instance: default, Level: 2
  LSP ID                             Sequence     Checksum     Lifetime     Overload     Attached
  1921.6800.1002.00-00           0x4           0x531a        65535             0           0

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

supervisor@rtbrick>spine1: op> show isis database lsp 1920.0100.4001.00-00
Instance: default, Level: 1
  LSP ID: 1920.0100.4001.00-00
	Interface:
	LSP Header:
  	Sequence: 0xc
  	Checksum: 0x9c74
  	Remaining lifetime: 65535 seconds
  	Flags: Attached: 0, Overload: 0
	Packet:
  	Length: 168 bytes
  	Last received time: 2020-11-02T06:46:46.473726+0000
  	Expiry: expires in 17h 52m 34s 950743us
	Dynamic Hostname TLV: spine1
	Protocols Supported TLVs:
  	Network layer protocol ID: IPv6
  	Network layer protocol ID: IPv4
	Area Address TLVs:
  	Area address: 49.0001
	Authentication TLV:
  	Value: 77b259cb36930819b0abb6120ceee2fd
	IS Reachability TLVs:
  	IS neighbor: 1920.0000.0006.00
  	IS neighbor: 1920.0100.4002.00
	IPv4 Reachability TLVs:
  	IPv4 prefix: 198.51.100.100/24               	Metric:  1000000   Internal   Up
  	IPv4 prefix: 198.51.100.22/24               	Metric:  1000000   Internal   Up
  	IPv4 prefix: 198.51.100.41/24               	Metric:  1000000   Internal   Up 	SID:	1   Flags: Node
	IPv6 Reachability TLVs:
  	IPv6 prefix: 2001:db8:0:41::/32             	Metric:  1000000   Internal   Up
   Segment Routing TLVs:
  	SRGB: Base: 10000, Range: 2000
Instance: default, Level: 2
  LSP ID: 1920.0100.4001.00-00
	Interface:
	LSP Header:
  	Sequence: 0x12
  	Checksum: 0x6407
  	Remaining lifetime: 65535 seconds
  	Flags: Attached: 0, Overload: 0
	Packet:
  	Length: 247 bytes
  	Last received time: 2020-11-02T06:47:06.466723+0000
  	Expiry: expires in 17h 52m 54s 889789us
	Dynamic Hostname TLV: spine1
	Protocols Supported TLVs:
  	Network layer protocol ID: IPv6
  	Network layer protocol ID: IPv4
	Area Address TLVs:
  	Area address: 49.0001
	Authentication TLV:
  	none
	IS Reachability TLVs:
	IPv4 Reachability TLVs:
  	IPv4 prefix: 198.51.100.100/24               	Metric:  1000000   Internal   Up
  	IPv4 prefix: 198.51.100.30/24               	Metric:  2000000   Internal   Up
  	IPv4 prefix: 198.51.100.20/24               	Metric:  2000000   Internal   Up
  	IPv4 prefix: 198.51.100.21/24               	Metric:  2000000   Internal   Up
  	IPv4 prefix: 198.51.100.22/24               	Metric:  1000000   Internal   Up
  	IPv4 prefix: 198.51.100.26/24                   Metric:  2000000   Internal   Up 	SID:	6   Flags: Re-advertisement, Node
  	IPv4 prefix: 198.51.100.41/24                   Metric:  1000000   Internal   Up 	SID:	1   Flags: Re-advertisement, Node
  	IPv4 prefix: 198.51.100.42/24                   Metric:  2000000   Internal   Up 	SID:	2   Flags: Re-advertisement, Node
	IPv6 Reachability TLVs:
  	IPv6 prefix: 2001:db8:0:41::/32             	Metric:  1000000   Internal   Up
  	IPv6 prefix: 2001:db8:0:42::/32             	Metric:  2000000   Internal   Up
   Segment Routing TLVs:
  	SRGB: Base: 10000, Range: 2000

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: 1920.0100.4001.00-00
	Interface:
	LSP Header:
  	Sequence: 0xc
  	Checksum: 0x9c74
  	Remaining lifetime: 65535 seconds
  	Flags: Attached: 0, Overload: 0
	Packet:
  	Length: 168 bytes
  	Last received time: 2020-11-02T06:46:46.473726+0000
  	Expiry: expires in 17h 50m 31s 759013us
	Dynamic Hostname TLV: spine1
	Protocols Supported TLVs:
  	Network layer protocol ID: IPv6
  	Network layer protocol ID: IPv4
	Area Address TLVs:
  	Area address: 49.0001
	Authentication TLV:
  	Value: 77b259cb36930819b0abb6120ceee2fd
	IS Reachability TLVs:
  	IS neighbor: 1920.0000.0006.00
  	IS neighbor: 1920.0100.4002.00
	IPv4 Reachability TLVs:
  	IPv4 prefix: 198.51.100.100/24               	Metric:  1000000   Internal   Up
  	IPv4 prefix: 198.51.100.22/24               	Metric:  1000000   Internal   Up
  	IPv4 prefix: 198.51.100.41/24                   Metric:  1000000   Internal   Up 	SID:	1   Flags: Node
	IPv6 Reachability TLVs:
  	IPv6 prefix: 2001:db8:0:41::/32             	Metric:  1000000   Internal   Up
   Segment Routing TLVs:
  	SRGB: Base: 10000, Range: 2000
  LSP ID: 1920.0100.4002.00-00
	Interface: ifl-0/1/2/12
	LSP Header:
  	Sequence: 0x9
  	Checksum: 0x89a6
  	Remaining lifetime: 65534 seconds
  	Flags: Attached: 0, Overload: 0
	Packet:
  	Length: 149 bytes
  	Last received time: 2020-11-02T06:45:59.814186+0000
  	Expiry: expires in 17h 49m 44s 99010us
	Dynamic Hostname TLV: none
	Protocols Supported TLVs:
  	Network layer protocol ID: IPv6
  	Network layer protocol ID: IPv4
	Area Address TLVs:
  	Area address: 49.0001
	Authentication TLV:
  	Value: 5892f2d37d7f23abcfcb48466276659c
	IS Reachability TLVs:
  	IS neighbor: 1920.0100.4001.00
	IPv4 Reachability TLVs:
  	IPv4 prefix: 198.51.100.30/24               Metric:  1000000   Internal   Up
  	IPv4 prefix: 198.51.100.22/24               Metric:  1000000   Internal   Up
  	IPv4 prefix: 198.51.100.42/24              	Metric:  1000000   Internal   Up 	SID:	2   Flags: Node
	IPv6 Reachability TLVs:
  	IPv6 prefix: 2001:db8:0:42::/32             Metric:  1000000   Internal   Up
   Segment Routing TLVs:
  	SRGB: Base: 70000, Range: 2000

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 	Expiry                	Overload 	Attached
  1920.0000.0006.00-00       	0xa   	0x8beb    	65534 	in 17h 44m 13s 390502us      	0        	0
  1920.0000.0007.00-00       	0x5   	0xdfbb    	65533 	in 17h 15m 49s 869683us      	0        	0
  1920.0000.0008.00-00       	0x6   	0x76f3    	65533 	in 17h 15m 51s 959359us      	0        	0
  1920.0000.0009.00-00       	0x6   	0x5b18    	65533 	in 17h 15m 51s 667570us      	0        	0
  spine1.00-00               	0xc   	0x9c74    	65535 	in 17h 43m 55s 63659us       	0        	0
  1920.0100.4002.00-00       	0x9   	0x89a6    	65534 	in 17h 43m 7s 403686us       	0        	0
Instance: default, Level: 2
  LSP ID                	Sequence 	Checksum 	Lifetime 	Expiry                	Overload 	Attached
  spine1.00-00              	0x12   	0x6407    	65535 	in 17h 44m 15s 21189us       	0        	0

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 1920.0100.4001.00-00
Instance: default, Level: 1
  LSP ID: 1920.0100.4001.00-00
	Interface:
	LSP Header:
  	Sequence: 0xc
  	Checksum: 0x9c74
  	Remaining lifetime: 65535 seconds
  	Flags: Attached: 0, Overload: 0
	Packet:
  	Length: 168 bytes
  	Last received time: 2020-11-02T06:46:46.473726+0000
  	Expiry: expires in 17h 52m 34s 950743us
	Dynamic Hostname TLV: spine1
	Protocols Supported TLVs:
  	Network layer protocol ID: IPv6
  	Network layer protocol ID: IPv4
	Area Address TLVs:
  	Area address: 49.0001
	Authentication TLV:
  	Value: 77b259cb36930819b0abb6120ceee2fd
	IS Reachability TLVs:
  	IS neighbor: 1920.0000.0006.00
  	IS neighbor: 1920.0100.4002.00
	IPv4 Reachability TLVs:
  	IPv4 prefix: 198.51.100.100/24              Metric:  1000000   Internal   Up
  	IPv4 prefix: 198.51.100.22/24               Metric:  1000000   Internal   Up
  	IPv4 prefix: 198.51.100.41/24               Metric:  1000000   Internal   Up 	SID:	1   Flags: Node
	IPv6 Reachability TLVs:
  	IPv6 prefix: 2001:db8:0:41::/32             Metric:  1000000   Internal   Up
   Segment Routing TLVs:
  	SRGB: Base: 10000, Range: 2000
Instance: default, Level: 2
  LSP ID: 1920.0100.4001.00-00
	Interface:
	LSP Header:
  	Sequence: 0x12
  	Checksum: 0x6407
  	Remaining lifetime: 65535 seconds
  	Flags: Attached: 0, Overload: 0
	Packet:
  	Length: 247 bytes
  	Last received time: 2020-11-02T06:47:06.466723+0000
  	Expiry: expires in 17h 52m 54s 889789us
	Dynamic Hostname TLV: spine1
	Protocols Supported TLVs:
  	Network layer protocol ID: IPv6
  	Network layer protocol ID: IPv4
	Area Address TLVs:
  	Area address: 49.0001
	Authentication TLV:
  	none
	IS Reachability TLVs:
	IPv4 Reachability TLVs:
  	IPv4 prefix: 198.51.100.100/24              Metric:  1000000   Internal   Up
  	IPv4 prefix: 198.51.100.30/24               Metric:  2000000   Internal   Up
  	IPv4 prefix: 198.51.100.20/24               Metric:  2000000   Internal   Up
  	IPv4 prefix: 198.51.100.21/24               Metric:  2000000   Internal   Up
  	IPv4 prefix: 198.51.100.22/24               Metric:  1000000   Internal   Up
  	IPv4 prefix: 198.51.100.26/24               Metric:  2000000   Internal   Up 	SID:	6   Flags: Re-advertisement, Node
  	IPv4 prefix: 198.51.100.41/24               Metric:  1000000   Internal   Up 	SID:	1   Flags: Re-advertisement, Node
  	IPv4 prefix: 198.51.100.42/24               Metric:  2000000   Internal   Up 	SID:	2   Flags: Re-advertisement, Node
	IPv6 Reachability TLVs:
  	IPv6 prefix: 2001:db8:0:41::/32             Metric:  1000000   Internal   Up
  	IPv6 prefix: 2001:db8:0:42::/32             Metric:  2000000   Internal   Up
   Segment Routing TLVs:
  	SRGB: Base: 10000, Range: 2000

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'.

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

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
  198.51.100.100/24             1	1000000   Internal 	n/a                   	local
  198.51.100.30/24              1	2000000   Internal 	198.51.100.21          	ifl-0/1/2/12
  198.51.100.20/24              1	2000000   Internal 	198.51.100.101         	ifl-0/1/6/16
  198.51.100.21/24              1	2000000   Internal 	198.51.100.101         	ifl-0/1/6/16
  198.51.100.22/24              1	1000000   Internal 	n/a                   	local
  198.51.100.26/24              1	2000000   Internal 	198.51.100.101         	ifl-0/1/6/16
  198.51.100.41/24              1	1000000   Internal 	n/a                   	local
  198.51.100.42/24             	1	2000000   Internal 	198.51.100.21          	ifl-0/1/2/12
Instance: default, AFI: ipv4, SAFI: labeled-unicast
  Prefix                	Level   Metric 	SID Index	Next Hop              	Interface        	Label
  198.51.100.26/24              1	2000000       	6	198.51.100.101         	ifl-0/1/6/16   	10006
  198.51.100.42/24              1	2000000       	2	198.51.100.21          	ifl-0/1/2/12   	10002
Instance: default, AFI: ipv6, SAFI: unicast
  Prefix                	Level   Metric 	Type     	Next Hop              	Interface
  2001:db8:0:41::/32            	1	1000000   Internal 	n/a                   	local
  2001:db8:0:42::/32            	1	2000000   Internal 	2001:db8:0:3433::  ifl-0/1/2/12

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
  198.51.100.100/24             1	1000000   Internal 	n/a                   	local
  198.51.100.30/24              1	2000000   Internal 	198.51.100.21        	ifl-0/1/2/12
  198.51.100.20/24              1	2000000   Internal 	198.51.100.101         	ifl-0/1/6/16
  198.51.100.21/24              1	2000000   Internal 	198.51.100.101         	ifl-0/1/6/16
  198.51.100.22/24              1	1000000   Internal 	n/a                   	local
  198.51.100.26/24              1	2000000   Internal 	198.51.100.101         	ifl-0/1/6/16
  198.51.100.41/24             	1	1000000   Internal 	n/a                   	local
  198.51.100.42/24              1	2000000   Internal 	198.51.100.21          	ifl-0/1/2/12
Instance: default, AFI: ipv4, SAFI: labeled-unicast
  Prefix                	Level   Metric 	SID Index	Next Hop              	Interface        	Label
  198.51.100.26/24              1	2000000       	6	198.51.100.101         	ifl-0/1/6/16   	10006
  198.51.100.42/24              1	2000000       	2	198.51.100.21          	ifl-0/1/2/12   	10002
Instance: default, AFI: ipv6, SAFI: unicast
  Prefix                	Level   Metric 	Type     	Next Hop              	Interface
  2001:db8:0:41::/32            	1	1000000   Internal 	n/a                 local
  2001:db8:0:42::/32            	1	2000000   Internal 	2001:db8:0:3433::  ifl-0/1/2/12

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
  198.51.100.100/24             1	1000000   Internal 	n/a                   	local
  198.51.100.30/24              1	2000000   Internal 	198.51.100.21          	ifl-0/1/2/12
  198.51.100.20/24              1	2000000   Internal 	198.51.100.101         	ifl-0/1/6/16
  198.51.100.21/24              1	2000000   Internal 	198.51.100.101         	ifl-0/1/6/16
  198.51.100.22/24              1	1000000   Internal 	n/a                   	local
  198.51.100.26/24              1	2000000   Internal 	198.51.100.101         	ifl-0/1/6/16
  198.51.100.41/24              1	1000000   Internal 	n/a                   	local
  198.51.100.42/24              1	2000000   Internal 	198.51.100.21          	ifl-0/1/2/12

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
  198.51.100.26/24   1	2000000       	6	198.51.100.101         	ifl-0/1/6/16   	10006
  198.51.100.42/24   1	2000000       	2	198.51.100.21          	ifl-0/1/2/12   	10002

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
  2001:db8:0:41::/32     1  	1000000   Internal 	n/a                  local
  2001:db8:0:42::/32     1	    2000000   Internal 	2001:db8:0:3433::  ifl-0/1/2/12

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

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
  isr2                           2000         1000
  isr5                           5000         1000
  isr6                           6000         1000
Instance: default, Level: 2
  System                    SRGB Base   SRGB Range
  isr2                           2000         1000
  isr3                           3000         1000
  isr4                           4000         1000
  isr5                           5000         1000

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
  isr1                      198.51.100.81/24                       3      10   None
  isr2                      198.51.100.71/24                       3      20   None
Instance: default, Level: 2
  System                    Prefix                               Range   SID     Flags
  isr2                      198.51.100.81/24                        3      10   Re-advertisement
  isr5                      198.51.100.81/24                        3      10   Re-advertisement
  isr5                      198.51.100.71/24                        3      20   Re-advertisement

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                      198.51.100.90/24                             100   Node
  isr1                      2001:db8:0:10::/32                           102   Node
  isr2                      198.51.100.91/24                             200   Node
  isr2                      2001:db8:0:11::/32                           202   Node
Instance: default, Level: 2
  System                    Prefix                                       SID     Flags
  isr2                      198.51.100.90/24                             100   Re-advertisement, Node
  isr2                      198.51.100.91/24                             200   Node
  isr2                      198.51.100.92/24                             500   Re-advertisement, Node
  isr2                      198.51.100.93/24                             600   Re-advertisement, Node
  isr2                      2001:db8:0:10::/32                           102   Re-advertisement, Node

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: ip2vrf, Level: 1
  System                       Label   Flags
  isr1                         11116   Value, Local, Persistent
  isr1                         11117   Ipv6 Encapsulation, Value, Local, Persistent
  isr2                         11112   Value, Local, Persistent
Instance: ip2vrf, Level: 2
  System                       Label   Flags

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.

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
  1920.0000.0006.00    1000000      1920.0000.0006.00     ifl-0/1/6/16   IPv4      198.51.100.101
  1920.0000.0006.00                                       ifl-0/1/6/16   IPv6      2001:db8:0:6843::
  1920.0100.4001.00     0                                 local
  1920.0100.4002.00    1000000      1920.0100.4002.00     ifl-0/1/2/12   IPv6      2001:db8:0:3433::
                                    1920.0100.4002.00     ifl-0/1/2/12   IPv4      198.51.100.21
Instance: default, Level: 2
  Destination Node          Metric       Neighbor Node         Interface         Nexthop   Address
  1920.0100.4001.00           0                                local

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
  1920.0000.0006.00      	1000000 	1920.0000.0006.00 	ifl-0/1/6/16	IPv4  	198.51.100.101
                                     	1920.0000.0006.00 	ifl-0/1/6/16	IPv6  	2001:db8:0:6843::
  1920.0100.4001.00            	0                       	local
  1920.0100.4002.00      	1000000 	1920.0100.4002.00 	ifl-0/1/2/12	IPv6  	2001:db8:0:3433::
                                     	1920.0100.4002.00 	ifl-0/1/2/12	IPv4  	198.51.100.21

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
  1920.0100.4001.00            	0                       	local

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
  1920.0000.0006.00      	1000000 	1920.0000.0006.00 	ifl-0/1/6/16	IPv4  	198.51.100.101
                                     	1920.0000.0006.00 	ifl-0/1/6/16	IPv6    2001:db8:0:6843::
  1920.0100.4001.00            	0                       	local
  1920.0100.4002.00      	1000000 	1920.0100.4002.00 	ifl-0/1/2/12	IPv6    2001:db8:0:3433::
                                     	1920.0100.4002.00 	ifl-0/1/2/12	IPv4  	198.51.100.21

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
  1920.0100.4001.00            	0                       	local

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.

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

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

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

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

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

The LSDB data is cleared for instance default