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: op> show isis overview
Instance: default
System ID: 1980.5110.0111
System hostname: isr1
Areas: 49.0001/24
Neighbor hold time: 30 sec
LSP life time: 65535 sec
Overload bit set: False
SRGB base: 10000
SRGB range: 1000
SRGB label values: 10000 - 10999
SRLB base: 20000
SRLB range: 1000
SRLB label values: 20000 - 20999
Authentication:
Level 1: md5, Level 2: md5
To access the Operational State API that corresponds to this CLI, click
include::common:partial$operational_api_links.adoc[tag=show_isis_overview].
IS-IS Interface
Syntax:
| Option | Description |
|---|---|
|
Without any option, this command displays a summary of all the IS-IS interfaces |
|
Displays IS-IS interface information for an instance |
|
Displays IS-IS interface statistics information |
|
Displays detailed output for all interfaces. |
Example 1: Summary view of the IS-IS interfaces
supervisor@rtbrick: op> show isis interface Instance: default Interface Level Adjacencies Metric Type Passive Unnumbered LDP-sync lo-0/0/0/0 1 0 1000000 loopback 1 0 - lo-0/0/0/0 2 0 1000000 loopback 1 0 - lo-0/0/0/1 1 0 1000000 loopback 1 0 - lo-0/0/0/1 2 0 1000000 loopback 1 0 - ifl-0/0/2/0 1 1 1000000 point-to-point 0 0 - ifl-0/0/2/0 2 1 1000000 point-to-point 0 0 - ifl-0/0/2/100 1 1 1000000 broadcast 0 0 - ifl-0/0/2/100 2 1 1000000 broadcast 0 0 -
Example 2: Summary view of the IS-IS interfaces for a specific instance
supervisor@rtbrick: op> show isis interface instance default Instance: default Interface Level Adjacencies Metric Type Passive Unnumbered LDP-sync lo-0/0/0/0 1 0 1000000 loopback 1 0 - lo-0/0/0/0 2 0 1000000 loopback 1 0 - lo-0/0/0/1 1 0 1000000 loopback 1 0 - lo-0/0/0/1 2 0 1000000 loopback 1 0 - ifl-0/0/2/0 1 1 1000000 point-to-point 0 0 - ifl-0/0/2/0 2 1 1000000 point-to-point 0 0 - ifl-0/0/2/100 1 1 1000000 broadcast 0 0 - ifl-0/0/2/100 2 1 1000000 broadcast 0 0 -
Example 3: Summary view of the IS-IS interfaces for a specific interface
supervisor@rtbrick: 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, Unnumbered: False
Metric: 1000000
Hello interval: 10 seconds, Hello multiplier: 3, Hold time: 30 seconds
Adjacencies: 1
CNSP in: 2, CNSP out: 3, CNSP success: 2, CNSP fail: 0
PSNP in: 1, PSNP out: 1, PSNP success: 1, PSNP fail: 0
LSP in: 2, LSP out: 0, LSP success: 2, LSP fail: 0, LSP in purge: 0 LSP in auth fail: 0
IIH in: 4, IIH out: 5
Interface: ifl-0/0/2/0, Level: 2
Type: point-to-point, Passive: False, Unnumbered: False
Metric: 1000000
Hello interval: 10 seconds, Hello multiplier: 3, Hold time: 30 seconds
Adjacencies: 1
CNSP in: 2, CNSP out: 3, CNSP success: 2, CNSP fail: 0
PSNP in: 3, PSNP out: 3, PSNP success: 3, PSNP fail: 0
LSP in: 4, LSP out: 0, LSP success: 4, LSP fail: 0, LSP in purge: 0 LSP in auth fail: 0
IIH in: 4, IIH out: 5
Example 4: Summary view of the IS-IS interface statistics
supervisor@rtbrick: 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 ifl-0/0/2/0 1 2 3 0 1 1 0 2 0 0 5 5 ifl-0/0/2/0 2 2 3 0 3 3 0 4 0 0 5 5 ifl-0/0/2/100 1 2 0 0 0 0 0 0 0 0 12 12 ifl-0/0/2/100 2 2 0 0 0 0 0 0 0 0 12 12
Example 5: Detailed output of the IS-IS interface
supervisor@rtbrick: op> show isis interface detail
Instance: default
Interface: lo-0/0/0/0, Level: 1
Type: loopback, Passive: True, Unnumbered: False
Metric: 1000000
Interface: lo-0/0/0/0, Level: 2
Type: loopback, Passive: True, Unnumbered: False
Metric: 1000000
Instance: default
Interface: lo-0/0/0/1, Level: 1
Type: loopback, Passive: True, Unnumbered: False
Metric: 1000000
Interface: lo-0/0/0/1, Level: 2
Type: loopback, Passive: True, Unnumbered: False
Metric: 1000000
Instance: default
Interface: ifl-0/0/2/0, Level: 1
Type: point-to-point, Passive: False, Unnumbered: False
Metric: 1000000
Hello interval: 10 seconds, Hello multiplier: 3, Hold time: 30 seconds
Adjacencies: 1
CNSP in: 2, CNSP out: 3, CNSP success: 2, CNSP fail: 0
PSNP in: 1, PSNP out: 1, PSNP success: 1, PSNP fail: 0
LSP in: 2, LSP out: 0, LSP success: 2, LSP fail: 0, LSP in purge: 0 LSP in auth fail: 0
IIH in: 5, IIH out: 5
Interface: ifl-0/0/2/0, Level: 2
Type: point-to-point, Passive: False, Unnumbered: False
Metric: 1000000
Hello interval: 10 seconds, Hello multiplier: 3, Hold time: 30 seconds
Adjacencies: 1
CNSP in: 2, CNSP out: 3, CNSP success: 2, CNSP fail: 0
PSNP in: 3, PSNP out: 3, PSNP success: 3, PSNP fail: 0
LSP in: 4, LSP out: 0, LSP success: 4, LSP fail: 0, LSP in purge: 0 LSP in auth fail: 0
IIH in: 5, IIH out: 5
Instance: default
Interface: ifl-0/0/2/100, Level: 1
Type: broadcast, Passive: False, Unnumbered: False, Circuit ID: 0x1
Metric: 1000000, Priority: 64
Hello interval: 10 seconds, Hello multiplier: 3, Hold time: 30 seconds
Designated IS: isr2.01(1980.5110.0121.01)
Adjacencies: 1
CNSP in: 2, CNSP out: 0, CNSP success: 2, 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: 12, IIH out: 12
Interface: ifl-0/0/2/100, Level: 2
Type: broadcast, Passive: False, Unnumbered: False, Circuit ID: 0x1
Metric: 1000000, Priority: 64
Hello interval: 10 seconds, Hello multiplier: 3, Hold time: 30 seconds
Designated IS: isr2.01(1980.5110.0121.01)
Adjacencies: 1
CNSP in: 2, CNSP out: 0, CNSP success: 2, 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: 12, IIH out: 12
Example 6: Detailed output of an IS-IS interface that supports broadcast
supervisor@rtbrick: 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, Unnumbered: False
Metric: 1000000
Hello interval: 10 seconds, Hello multiplier: 3, Hold time: 30 seconds
Adjacencies: 1
CNSP in: 2, CNSP out: 3, CNSP success: 2, CNSP fail: 0
PSNP in: 1, PSNP out: 1, PSNP success: 1, PSNP fail: 0
LSP in: 2, LSP out: 0, LSP success: 2, LSP fail: 0, LSP in purge: 0 LSP in auth fail: 0
IIH in: 4, IIH out: 5
Interface: ifl-0/0/2/0, Level: 2
Type: point-to-point, Passive: False, Unnumbered: False
Metric: 1000000
Hello interval: 10 seconds, Hello multiplier: 3, Hold time: 30 seconds
Adjacencies: 1
CNSP in: 2, CNSP out: 3, CNSP success: 2, CNSP fail: 0
PSNP in: 3, PSNP out: 3, PSNP success: 3, PSNP fail: 0
LSP in: 4, LSP out: 0, LSP success: 4, LSP fail: 0, LSP in purge: 0 LSP in auth fail: 0
IIH in: 4, IIH out: 5
To access the Operational State API that corresponds to this CLI, click
include::common:partial$operational_api_links.adoc[tag=show_isis_interface].
IS-IS Neighbor
Syntax:
| Option | Description |
|---|---|
|
Without any option, this command displays a summary of all the IS-IS neighbors |
|
Displays detailed information for IS-IS neighbor |
|
Displays IS-IS neighbor information for an instance |
Example 1: Summary view of the IS-IS neighbor
supervisor@rtbrick: op> show isis neighbor Instance: default Interface System Level State Type Up since Expires ifl-0/0/2/0 isr2 L1L2 Up P2P Fri Jun 05 14:46:38 in 26s 282325us ifl-0/0/2/100 isr2 L1 Up Broadcast Fri Jun 05 14:46:38 in 26s 81964us ifl-0/0/2/100 isr2 L2 Up Broadcast Fri Jun 05 14:46:40 in 26s 81794us
Example 2: Detailed view of the IS-IS neighbor
supervisor@rtbrick: op> show isis neighbor detail
Instance: default
System: isr2, Interface: ifl-0/0/2/0
State: Up, Level: L1L2, Adjacency type: P2P
Circuit type: L1L2, Hold time: 30.0s, Expiry time: in 25s 207558us
Local IPv4 address: 192.0.2.1, Remote IPv4 address: 192.0.2.2, Unnumbered: False
Local IPv6 address: fe80::9819:2cff:fe06:b503, Remote IPv6 address: fe80::9819:2cff:fe99:472d
IPv4 Adjacency SID: 20112, IPv6 Adjacency SID: 20312
Up since: Fri Jun 05 14:46:38 GMT +0000 2026, Last down reason: NA
Last transition: 2026-06-05T14:46:38.990940+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, BFD down: 0
Interface configuration: 0, Area configuration: 0, Other: 0
System: isr2, Interface: ifl-0/0/2/100
State: Up, Level: L1, Adjacency type: Broadcast
Circuit type: L1L2, Hold time: 30.0s, Expiry time: in 25s 7151us
Priority: 64, Designated IS: isr2.01(1980.5110.0121.01), SNPA: 98:19:2c:99:47:2d
Local IPv4 address: 192.0.2.5, Remote IPv4 address: 192.0.2.6, Unnumbered: False
Local IPv6 address: fe80::9819:2c00:6406:b503, Remote IPv6 address: fe80::9819:2c00:6499:472d
Up since: Fri Jun 05 14:46:38 GMT +0000 2026, Last down reason: NA
Last transition: 2026-06-05T14:46:39.518114+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, BFD down: 0
Interface configuration: 0, Area configuration: 0, Other: 0
System: isr2, Interface: ifl-0/0/2/100
State: Up, Level: L2, Adjacency type: Broadcast
Circuit type: L1L2, Hold time: 30.0s, Expiry time: in 25s 6941us
Priority: 64, Designated IS: isr2.01(1980.5110.0121.01), SNPA: 98:19:2c:99:47:2d
Local IPv4 address: 192.0.2.5, Remote IPv4 address: 192.0.2.6, Unnumbered: False
Local IPv6 address: fe80::9819:2c00:6406:b503, Remote IPv6 address: fe80::9819:2c00:6499:472d
Up since: Fri Jun 05 14:46:40 GMT +0000 2026, Last down reason: NA
Last transition: 2026-06-05T14:46:40.764532+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, BFD down: 0
Interface configuration: 0, Area configuration: 0, Other: 0
Example 3: Summary view of the IS-IS neighbor for the specified instance
supervisor@rtbrick: op> show isis neighbor instance default Instance: default Interface System Level State Type Up since Expires ifl-0/0/2/0 isr2 L1L2 Up P2P Fri Jun 05 14:46:38 in 24s 182062us ifl-0/0/2/100 isr2 L1 Up Broadcast Fri Jun 05 14:46:38 in 23s 981695us ifl-0/0/2/100 isr2 L2 Up Broadcast Fri Jun 05 14:46:40 in 23s 981520us
Example 4: Detailed view of the IS-IS neighbor for the specified instance
supervisor@rtbrick: op> show isis neighbor instance default detail
Instance: default
System: isr2, Interface: ifl-0/0/2/0
State: Up, Level: L1L2, Adjacency type: P2P
Circuit type: L1L2, Hold time: 30.0s, Expiry time: in 23s 173876us
Local IPv4 address: 192.0.2.1, Remote IPv4 address: 192.0.2.2, Unnumbered: False
Local IPv6 address: fe80::9819:2cff:fe06:b503, Remote IPv6 address: fe80::9819:2cff:fe99:472d
IPv4 Adjacency SID: 20112, IPv6 Adjacency SID: 20312
Up since: Fri Jun 05 14:46:38 GMT +0000 2026, Last down reason: NA
Last transition: 2026-06-05T14:46:38.990940+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, BFD down: 0
Interface configuration: 0, Area configuration: 0, Other: 0
System: isr2, Interface: ifl-0/0/2/100
State: Up, Level: L1, Adjacency type: Broadcast
Circuit type: L1L2, Hold time: 30.0s, Expiry time: in 22s 973463us
Priority: 64, Designated IS: isr2.01(1980.5110.0121.01), SNPA: 98:19:2c:99:47:2d
Local IPv4 address: 192.0.2.5, Remote IPv4 address: 192.0.2.6, Unnumbered: False
Local IPv6 address: fe80::9819:2c00:6406:b503, Remote IPv6 address: fe80::9819:2c00:6499:472d
Up since: Fri Jun 05 14:46:38 GMT +0000 2026, Last down reason: NA
Last transition: 2026-06-05T14:46:39.518114+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, BFD down: 0
Interface configuration: 0, Area configuration: 0, Other: 0
System: isr2, Interface: ifl-0/0/2/100
State: Up, Level: L2, Adjacency type: Broadcast
Circuit type: L1L2, Hold time: 30.0s, Expiry time: in 22s 973251us
Priority: 64, Designated IS: isr2.01(1980.5110.0121.01), SNPA: 98:19:2c:99:47:2d
Local IPv4 address: 192.0.2.5, Remote IPv4 address: 192.0.2.6, Unnumbered: False
Local IPv6 address: fe80::9819:2c00:6406:b503, Remote IPv6 address: fe80::9819:2c00:6499:472d
Up since: Fri Jun 05 14:46:40 GMT +0000 2026, Last down reason: NA
Last transition: 2026-06-05T14:46:40.764532+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, BFD down: 0
Interface configuration: 0, Area configuration: 0, Other: 0
To access the Operational State API that corresponds to this CLI, click
include::common:partial$operational_api_links.adoc[tag=show_isis_neighbor].
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:
| Option | Description |
|---|---|
|
Without any option, this command displays a summary of all the IS-IS. |
|
Displays DIS history information for the specified instance. |
|
Displays IS-IS DIS history information for the specified interface. |
|
Displays IS-IS DIS history information for the specified level. |
Example: Summary view of IS-IS DIS Election History
supervisor@rtbrick: op> show isis dis-election history Instance: default, Interface: ifl-0/0/2/100, Level: 1 Timestamp DIS Event Fri Jun 05 14:46:38 GMT +0000 2026 - Neighbour 1980.5110.0121 adjacency state changed from Init to Up Fri Jun 05 14:46:39 GMT +0000 2026 1980.5110.0121.01 Neighbour 1980.5110.0121 DIS changed from 0000.0000.0000.00 to 1980.5110.0121.01 Instance: default, Interface: ifl-0/0/2/100, Level: 2 Timestamp DIS Event Fri Jun 05 14:46:40 GMT +0000 2026 - Neighbour 1980.5110.0121 adjacency state changed from Init to Up Fri Jun 05 14:46:40 GMT +0000 2026 1980.5110.0121.01 Neighbour 1980.5110.0121 DIS changed from 0000.0000.0000.00 to 1980.5110.0121.01
IS-IS Hostname
Syntax:
| 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: op> show isis hostname Instance System-ID Hostname default 1980.5110.0111 isr1 default 1980.5110.0121 isr2
IS-IS Database
Syntax:
| Option | Description |
|---|---|
|
Without any option, this command displays all the IS-IS databases |
|
Displays detailed information for IS-IS database |
|
Displays IS-IS database information for an instance |
|
Displays a summary of IS-IS database for the specified LSP name. |
|
Displays a summary of IS-IS database for the specified LSP ID. |
|
Displays a summary of IS-IS database LSP information for specified level |
|
Displays a summary of IS-IS database for all LSPs from a system |
|
Displays a summary of IS-IS database for all LSPs from a system on the specified level. |
|
Displays detailed information for the specified level |
Example 1: Summary view of the IS-IS Database
supervisor@rtbrick: op> show isis database Instance: default, Level: 1 LSP ID Sequence Checksum Lifetime Overload Attached isr1.00-00 0x4 0x8517 65514 0 0 isr2.00-00 0x3 0x1c4 65514 0 0 isr2.01-00 0x1 0x2cff 65514 0 0 Instance: default, Level: 2 LSP ID Sequence Checksum Lifetime Overload Attached isr1.00-00 0x6 0x7696 65514 0 0 isr2.00-00 0x6 0x44fc 65514 0 0 isr2.01-00 0x1 0x8e6f 65514 0 0
Example 2: Summary view of the IS-IS database for the specified LSP
supervisor@rtbrick: op> show isis database lsp id 1980.5110.0111.00-00
Instance: default, Level: 1
LSP ID: isr1.00-00
Interface:
LSP Header:
Sequence: 0x4
Checksum: 0x8517
Remaining lifetime: 65535 seconds
Flags: Attached: 0, Overload: 0
Packet:
Length: 248 bytes
Last received time: 2026-06-05T14:46:39.731129+0000
Expiry: expires in 18h 11m 52s 625218us
System ID: 1980.5110.0111
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
Authentication TLV (10):
Type: md5
Value: 65dfacffdbdbfa061d402f51d41b358d
IS Reachability TLVs (22):
IS neighbor: 1980.5110.0121.00 Metric: 1000000
Adjacency SID:
Value: 20112, Flags: Value, Local, Persistent
Value: 20312, Flags: Ipv6 Encapsulation, Value, Local, Persistent
IS neighbor: 1980.5110.0121.01 Metric: 1000000
IPv4 Reachability TLVs (135):
IPv4 prefix: 192.0.2.0/30 Metric: 1000000 Internal Up
IPv4 prefix: 192.0.2.4/30 Metric: 1000000 Internal Up
IPv4 prefix: 198.51.100.11/32 Metric: 1000000 Internal Up SID: 100 Flags: Node
IPv4 prefix: 198.51.100.12/32 Metric: 1000000 Internal Up
IPv6 Reachability TLVs (236):
IPv6 prefix: 2001:db8:1:1::/64 Metric: 1000000 Internal Up
IPv6 prefix: 2001:db8:2:1::/64 Metric: 1000000 Internal Up
IPv6 prefix: 2001:db8:0:1::11/128 Metric: 1000000 Internal Up SID: 101 Flags: Node
IPv6 prefix: 2001:db8:0:1::12/128 Metric: 1000000 Internal Up
Segment Routing TLVs (242/sub 2):
SRGB: Base: 10000, Range: 1000, Router ID: 198.51.100.11
Instance: default, Level: 2
LSP ID: isr1.00-00
Interface:
LSP Header:
Sequence: 0x6
Checksum: 0x7696
Remaining lifetime: 65535 seconds
Flags: Attached: 0, Overload: 0
Packet:
Length: 342 bytes
Last received time: 2026-06-05T14:46:40.976088+0000
Expiry: expires in 18h 11m 53s 824945us
System ID: 1980.5110.0111
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
Authentication TLV (10):
Type: md5
Value: 5a9b30d2500f2c55f71c8b3636e3c631
IS Reachability TLVs (22):
IS neighbor: 1980.5110.0121.00 Metric: 1000000
Adjacency SID:
Value: 20112, Flags: Value, Local, Persistent
Value: 20312, Flags: Ipv6 Encapsulation, Value, Local, Persistent
IS neighbor: 1980.5110.0121.01 Metric: 1000000
IPv4 Reachability TLVs (135):
IPv4 prefix: 192.0.2.0/30 Metric: 1000000 Internal Up
IPv4 prefix: 192.0.2.4/30 Metric: 1000000 Internal Up
IPv4 prefix: 198.51.100.11/32 Metric: 1000000 Internal Up SID: 100 Flags: Node
IPv4 prefix: 198.51.100.12/32 Metric: 1000000 Internal Up
IPv4 prefix: 198.51.100.21/32 Metric: 2000000 Internal Up SID: 200 Flags: Re-advertisement, Node
IPv4 prefix: 198.51.100.22/32 Metric: 2000000 Internal Up
IPv6 Reachability TLVs (236):
IPv6 prefix: 2001:db8:1:1::/64 Metric: 1000000 Internal Up
IPv6 prefix: 2001:db8:2:1::/64 Metric: 1000000 Internal Up
IPv6 prefix: 2001:db8:0:1::11/128 Metric: 1000000 Internal Up SID: 101 Flags: Node
IPv6 prefix: 2001:db8:0:1::12/128 Metric: 1000000 Internal Up
IPv6 prefix: 2001:db8:0:1::21/128 Metric: 2000000 Internal Up SID: 201 Flags: Re-advertisement, Node
IPv6 prefix: 2001:db8:0:1::22/128 Metric: 2000000 Internal Up
Segment Routing TLVs (242/sub 2):
SRGB: Base: 10000, Range: 1000, Router ID: 198.51.100.11
Example 3: Detailed view of the IS-IS database for level-1
supervisor@rtbrick: op> show isis database level-1 detail
Instance: default, Level: 1
LSP ID: isr1.00-00
Interface:
LSP Header:
Sequence: 0x4
Checksum: 0x8517
Remaining lifetime: 65511 seconds
Flags: Attached: 0, Overload: 0
Packet:
Length: 248 bytes
Last received time: 2026-06-05T14:46:39.731129+0000
Expiry: expires in 18h 11m 51s 541232us
System ID: 1980.5110.0111
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
Authentication TLV (10):
Type: md5
Value: 65dfacffdbdbfa061d402f51d41b358d
IS Reachability TLVs (22):
IS neighbor: 1980.5110.0121.00 Metric: 1000000
Adjacency SID:
Value: 20112, Flags: Value, Local, Persistent
Value: 20312, Flags: Ipv6 Encapsulation, Value, Local, Persistent
IS neighbor: 1980.5110.0121.01 Metric: 1000000
IPv4 Reachability TLVs (135):
IPv4 prefix: 192.0.2.0/30 Metric: 1000000 Internal Up
IPv4 prefix: 192.0.2.4/30 Metric: 1000000 Internal Up
IPv4 prefix: 198.51.100.11/32 Metric: 1000000 Internal Up SID: 100 Flags: Node
IPv4 prefix: 198.51.100.12/32 Metric: 1000000 Internal Up
IPv6 Reachability TLVs (236):
IPv6 prefix: 2001:db8:1:1::/64 Metric: 1000000 Internal Up
IPv6 prefix: 2001:db8:2:1::/64 Metric: 1000000 Internal Up
IPv6 prefix: 2001:db8:0:1::11/128 Metric: 1000000 Internal Up SID: 101 Flags: Node
IPv6 prefix: 2001:db8:0:1::12/128 Metric: 1000000 Internal Up
Segment Routing TLVs (242/sub 2):
SRGB: Base: 10000, Range: 1000, Router ID: 198.51.100.11
LSP ID: isr2.00-00
Interface: ifl-0/0/2/0
LSP Header:
Sequence: 0x3
Checksum: 0x1c4
Remaining lifetime: 65511 seconds
Flags: Attached: 0, Overload: 0
Packet:
Length: 248 bytes
Last received time: 2026-06-05T14:46:39.411068+0000
Expiry: expires in 18h 11m 51s 220843us
System ID: 1980.5110.0121
Dynamic Hostname TLV (137): isr2
Protocols Supported TLVs (129):
Network layer protocol ID: IPv6
Network layer protocol ID: IPv4
Area Address TLVs (1):
Area address: 49.0001
Authentication TLV (10):
Type: md5
Value: 1f82cbc53859f87066a51805990662d7
IS Reachability TLVs (22):
IS neighbor: 1980.5110.0111.00 Metric: 1000000
Adjacency SID:
Value: 21121, Flags: Value, Local, Persistent
Value: 21321, Flags: Ipv6 Encapsulation, Value, Local, Persistent
IS neighbor: 1980.5110.0121.01 Metric: 1000000
IPv4 Reachability TLVs (135):
IPv4 prefix: 192.0.2.0/30 Metric: 1000000 Internal Up
IPv4 prefix: 192.0.2.4/30 Metric: 1000000 Internal Up
IPv4 prefix: 198.51.100.21/32 Metric: 1000000 Internal Up SID: 200 Flags: Node
IPv4 prefix: 198.51.100.22/32 Metric: 1000000 Internal Up
IPv6 Reachability TLVs (236):
IPv6 prefix: 2001:db8:1:1::/64 Metric: 1000000 Internal Up
IPv6 prefix: 2001:db8:2:1::/64 Metric: 1000000 Internal Up
IPv6 prefix: 2001:db8:0:1::21/128 Metric: 1000000 Internal Up SID: 201 Flags: Node
IPv6 prefix: 2001:db8:0:1::22/128 Metric: 1000000 Internal Up
Segment Routing TLVs (242/sub 2):
SRGB: Base: 11000, Range: 1000, Router ID: 198.51.100.21
LSP ID: isr2.01-00
Interface: ifl-0/0/2/0
LSP Header:
Sequence: 0x1
Checksum: 0x2cff
Remaining lifetime: 65511 seconds
Flags: Attached: 0, Overload: 0
Packet:
Length: 80 bytes
Last received time: 2026-06-05T14:46:39.411333+0000
Expiry: expires in 18h 11m 51s 220905us
System ID: 1980.5110.0121
Protocols Supported TLVs (129):
Network layer protocol ID: IPv6
Network layer protocol ID: IPv4
Area Address TLVs (1):
Area address: 49.0001
Authentication TLV (10):
Type: md5
Value: d6d4ece4874d0946847e3e9a81621364
IS Reachability TLVs (22):
IS neighbor: 1980.5110.0111.00 Metric: 0
IS neighbor: 1980.5110.0121.00 Metric: 0
Example 4: Summary view of the IS-IS database for the specified instance
supervisor@rtbrick: op> show isis database instance default Instance: default, Level: 1 LSP ID Sequence Checksum Lifetime Overload Attached isr1.00-00 0x4 0x8517 65510 0 0 isr2.00-00 0x3 0x1c4 65510 0 0 isr2.01-00 0x1 0x2cff 65510 0 0 Instance: default, Level: 2 LSP ID Sequence Checksum Lifetime Overload Attached isr1.00-00 0x6 0x7696 65511 0 0 isr2.00-00 0x6 0x44fc 65511 0 0 isr2.01-00 0x1 0x8e6f 65511 0 0
Example 5: Summary view of the IS-IS database for the specified instance and LSP
supervisor@rtbrick: op> show isis database instance default lsp id 1980.5110.0111.00-00
Instance: default, Level: 1
LSP ID: isr1.00-00
Interface:
LSP Header:
Sequence: 0x4
Checksum: 0x8517
Remaining lifetime: 65535 seconds
Flags: Attached: 0, Overload: 0
Packet:
Length: 248 bytes
Last received time: 2026-06-05T14:46:39.731129+0000
Expiry: expires in 18h 11m 49s 461377us
System ID: 1980.5110.0111
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
Authentication TLV (10):
Type: md5
Value: 65dfacffdbdbfa061d402f51d41b358d
IS Reachability TLVs (22):
IS neighbor: 1980.5110.0121.00 Metric: 1000000
Adjacency SID:
Value: 20112, Flags: Value, Local, Persistent
Value: 20312, Flags: Ipv6 Encapsulation, Value, Local, Persistent
IS neighbor: 1980.5110.0121.01 Metric: 1000000
IPv4 Reachability TLVs (135):
IPv4 prefix: 192.0.2.0/30 Metric: 1000000 Internal Up
IPv4 prefix: 192.0.2.4/30 Metric: 1000000 Internal Up
IPv4 prefix: 198.51.100.11/32 Metric: 1000000 Internal Up SID: 100 Flags: Node
IPv4 prefix: 198.51.100.12/32 Metric: 1000000 Internal Up
IPv6 Reachability TLVs (236):
IPv6 prefix: 2001:db8:1:1::/64 Metric: 1000000 Internal Up
IPv6 prefix: 2001:db8:2:1::/64 Metric: 1000000 Internal Up
IPv6 prefix: 2001:db8:0:1::11/128 Metric: 1000000 Internal Up SID: 101 Flags: Node
IPv6 prefix: 2001:db8:0:1::12/128 Metric: 1000000 Internal Up
Segment Routing TLVs (242/sub 2):
SRGB: Base: 10000, Range: 1000, Router ID: 198.51.100.11
Instance: default, Level: 2
LSP ID: isr1.00-00
Interface:
LSP Header:
Sequence: 0x6
Checksum: 0x7696
Remaining lifetime: 65535 seconds
Flags: Attached: 0, Overload: 0
Packet:
Length: 342 bytes
Last received time: 2026-06-05T14:46:40.976088+0000
Expiry: expires in 18h 11m 50s 661866us
System ID: 1980.5110.0111
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
Authentication TLV (10):
Type: md5
Value: 5a9b30d2500f2c55f71c8b3636e3c631
IS Reachability TLVs (22):
IS neighbor: 1980.5110.0121.00 Metric: 1000000
Adjacency SID:
Value: 20112, Flags: Value, Local, Persistent
Value: 20312, Flags: Ipv6 Encapsulation, Value, Local, Persistent
IS neighbor: 1980.5110.0121.01 Metric: 1000000
IPv4 Reachability TLVs (135):
IPv4 prefix: 192.0.2.0/30 Metric: 1000000 Internal Up
IPv4 prefix: 192.0.2.4/30 Metric: 1000000 Internal Up
IPv4 prefix: 198.51.100.11/32 Metric: 1000000 Internal Up SID: 100 Flags: Node
IPv4 prefix: 198.51.100.12/32 Metric: 1000000 Internal Up
IPv4 prefix: 198.51.100.21/32 Metric: 2000000 Internal Up SID: 200 Flags: Re-advertisement, Node
IPv4 prefix: 198.51.100.22/32 Metric: 2000000 Internal Up
IPv6 Reachability TLVs (236):
IPv6 prefix: 2001:db8:1:1::/64 Metric: 1000000 Internal Up
IPv6 prefix: 2001:db8:2:1::/64 Metric: 1000000 Internal Up
IPv6 prefix: 2001:db8:0:1::11/128 Metric: 1000000 Internal Up SID: 101 Flags: Node
IPv6 prefix: 2001:db8:0:1::12/128 Metric: 1000000 Internal Up
IPv6 prefix: 2001:db8:0:1::21/128 Metric: 2000000 Internal Up SID: 201 Flags: Re-advertisement, Node
IPv6 prefix: 2001:db8:0:1::22/128 Metric: 2000000 Internal Up
Segment Routing TLVs (242/sub 2):
SRGB: Base: 10000, Range: 1000, Router ID: 198.51.100.11
IS-IS Route
Syntax:
| Option | Description |
|---|---|
|
Without any option, this command displays a summary of the IS-IS route information |
|
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: op> show isis route
Instance: default, AFI: ipv4, SAFI: unicast
Prefix Level Metric Type Next Hop Interface
192.0.2.0/30 1 1000000 Internal n/a local
192.0.2.4/30 1 1000000 Internal n/a local
198.51.100.11/32 1 1000000 Internal n/a local
198.51.100.12/32 1 1000000 Internal n/a local
198.51.100.21/32 1 2000000 Internal 192.0.2.2 ifl-0/0/2/0
192.0.2.6 ifl-0/0/2/100
198.51.100.22/32 1 2000000 Internal 192.0.2.2 ifl-0/0/2/0
192.0.2.6 ifl-0/0/2/100
Instance: default, AFI: ipv4, SAFI: labeled-unicast
Prefix Level Metric SID Index Next Hop Interface Label
198.51.100.11/32 1 1000000 100 n/a local 10100
198.51.100.21/32 1 2000000 200 192.0.2.2 ifl-0/0/2/0 10200
192.0.2.6 ifl-0/0/2/100 10200
Instance: default, AFI: ipv6, SAFI: unicast
Prefix Level Metric Type Next Hop Interface
2001:db8:0:1::11/128 1 1000000 Internal n/a local
2001:db8:0:1::12/128 1 1000000 Internal n/a local
2001:db8:0:1::21/128 1 2000000 Internal fe80::9819:2cff:fe99:472d ifl-0/0/2/0
fe80::9819:2c00:6499:472d ifl-0/0/2/100
2001:db8:0:1::22/128 1 2000000 Internal fe80::9819:2cff:fe99:472d ifl-0/0/2/0
fe80::9819:2c00:6499:472d ifl-0/0/2/100
2001:db8:1:1::/64 1 1000000 Internal n/a local
2001:db8:2:1::/64 1 1000000 Internal n/a local
Instance: default, AFI: ipv6, SAFI: labeled-unicast
Prefix Level Metric SID Index Next Hop Interface Label
2001:db8:0:1::11/128 1 1000000 101 n/a local 10101
2001:db8:0:1::21/128 1 2000000 201 fe80::9819:2cff:fe99:472d ifl-0/0/2/0 10201
fe80::9819:2c00:6499:472d ifl-0/0/2/100 10201
Instance: default, AFI: mpls
Label Level Next Hop Interface
label:10100 1 n/a local
label:10100,bos:1 1 n/a local
label:10101 1 n/a local
label:10101,bos:1 1 n/a local
label:10200 1 192.0.2.2 ifl-0/0/2/0
192.0.2.6 ifl-0/0/2/100
label:10200,bos:1 1 192.0.2.2 ifl-0/0/2/0
192.0.2.6 ifl-0/0/2/100
label:10201 1 fe80::9819:2cff:fe99:472d ifl-0/0/2/0
fe80::9819:2c00:6499:472d ifl-0/0/2/100
label:10201,bos:1 1 fe80::9819:2cff:fe99:472d ifl-0/0/2/0
fe80::9819:2c00:6499:472d ifl-0/0/2/100
label:20112 1 192.0.2.2 ifl-0/0/2/0
label:20112,bos:1 1 192.0.2.2 ifl-0/0/2/0
label:20312 1 fe80::9819:2cff:fe99:472d ifl-0/0/2/0
label:20312,bos:1 1 fe80::9819:2cff:fe99:472d ifl-0/0/2/0
Example 2: Summary view of the IS-IS routes for the specified instance
supervisor@rtbrick: op> show isis route instance default
Instance: default, AFI: ipv4, SAFI: unicast
Prefix Level Metric Type Next Hop Interface
192.0.2.0/30 1 1000000 Internal n/a local
192.0.2.4/30 1 1000000 Internal n/a local
198.51.100.11/32 1 1000000 Internal n/a local
198.51.100.12/32 1 1000000 Internal n/a local
198.51.100.21/32 1 2000000 Internal 192.0.2.2 ifl-0/0/2/0
192.0.2.6 ifl-0/0/2/100
198.51.100.22/32 1 2000000 Internal 192.0.2.2 ifl-0/0/2/0
192.0.2.6 ifl-0/0/2/100
Instance: default, AFI: ipv4, SAFI: labeled-unicast
Prefix Level Metric SID Index Next Hop Interface Label
198.51.100.11/32 1 1000000 100 n/a local 10100
198.51.100.21/32 1 2000000 200 192.0.2.2 ifl-0/0/2/0 10200
192.0.2.6 ifl-0/0/2/100 10200
Instance: default, AFI: ipv6, SAFI: unicast
Prefix Level Metric Type Next Hop Interface
2001:db8:0:1::11/128 1 1000000 Internal n/a local
2001:db8:0:1::12/128 1 1000000 Internal n/a local
2001:db8:0:1::21/128 1 2000000 Internal fe80::9819:2cff:fe99:472d ifl-0/0/2/0
fe80::9819:2c00:6499:472d ifl-0/0/2/100
2001:db8:0:1::22/128 1 2000000 Internal fe80::9819:2cff:fe99:472d ifl-0/0/2/0
fe80::9819:2c00:6499:472d ifl-0/0/2/100
2001:db8:1:1::/64 1 1000000 Internal n/a local
2001:db8:2:1::/64 1 1000000 Internal n/a local
Instance: default, AFI: ipv6, SAFI: labeled-unicast
Prefix Level Metric SID Index Next Hop Interface Label
2001:db8:0:1::11/128 1 1000000 101 n/a local 10101
2001:db8:0:1::21/128 1 2000000 201 fe80::9819:2cff:fe99:472d ifl-0/0/2/0 10201
fe80::9819:2c00:6499:472d ifl-0/0/2/100 10201
Instance: default, AFI: mpls
Label Level Next Hop Interface
label:10100 1 n/a local
label:10100,bos:1 1 n/a local
label:10101 1 n/a local
label:10101,bos:1 1 n/a local
label:10200 1 192.0.2.2 ifl-0/0/2/0
192.0.2.6 ifl-0/0/2/100
label:10200,bos:1 1 192.0.2.2 ifl-0/0/2/0
192.0.2.6 ifl-0/0/2/100
label:10201 1 fe80::9819:2cff:fe99:472d ifl-0/0/2/0
fe80::9819:2c00:6499:472d ifl-0/0/2/100
label:10201,bos:1 1 fe80::9819:2cff:fe99:472d ifl-0/0/2/0
fe80::9819:2c00:6499:472d ifl-0/0/2/100
label:20112 1 192.0.2.2 ifl-0/0/2/0
label:20112,bos:1 1 192.0.2.2 ifl-0/0/2/0
label:20312 1 fe80::9819:2cff:fe99:472d ifl-0/0/2/0
label:20312,bos:1 1 fe80::9819:2cff:fe99:472d ifl-0/0/2/0
Example 3: Summary view of the IS-IS routes for the specified instance and address family (IPv4 unicast).
supervisor@rtbrick: op> show isis route instance default ipv4 unicast
Instance: default, AFI: ipv4, SAFI: unicast
Prefix Level Metric Type Next Hop Interface
192.0.2.0/30 1 1000000 Internal n/a local
192.0.2.4/30 1 1000000 Internal n/a local
198.51.100.11/32 1 1000000 Internal n/a local
198.51.100.12/32 1 1000000 Internal n/a local
198.51.100.21/32 1 2000000 Internal 192.0.2.2 ifl-0/0/2/0
192.0.2.6 ifl-0/0/2/100
198.51.100.22/32 1 2000000 Internal 192.0.2.2 ifl-0/0/2/0
192.0.2.6 ifl-0/0/2/100
Example 4: Summary view of the IS-IS routes for the specified instance and address family (IPv6 unicast).
supervisor@rtbrick: op> show isis route instance default ipv6 unicast
Instance: default, AFI: ipv6, SAFI: unicast
Prefix Level Metric Type Next Hop Interface
2001:db8:0:1::11/128 1 1000000 Internal n/a local
2001:db8:0:1::12/128 1 1000000 Internal n/a local
2001:db8:0:1::21/128 1 2000000 Internal fe80::9819:2cff:fe99:472d ifl-0/0/2/0
fe80::9819:2c00:6499:472d ifl-0/0/2/100
2001:db8:0:1::22/128 1 2000000 Internal fe80::9819:2cff:fe99:472d ifl-0/0/2/0
fe80::9819:2c00:6499:472d ifl-0/0/2/100
2001:db8:1:1::/64 1 1000000 Internal n/a local
2001:db8:2:1::/64 1 1000000 Internal n/a local
Example 5: Summary view of the IS-IS routes for the specified instance and address family (IPv4 labeled-unicast).
supervisor@rtbrick: 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
198.51.100.11/32 1 1000000 100 n/a local 10100
198.51.100.21/32 1 2000000 200 192.0.2.2 ifl-0/0/2/0 10200
192.0.2.6 ifl-0/0/2/100 10200
Example 6: Summary view of the IS-IS routes for the specified instance and address family (IPv6 labeled-unicast).
supervisor@rtbrick: op> show isis route instance default ipv6 labeled-unicast
Instance: default, AFI: ipv6, SAFI: labeled-unicast
Prefix Level Metric SID Index Next Hop Interface Label
2001:db8:0:1::11/128 1 1000000 101 n/a local 10101
2001:db8:0:1::21/128 1 2000000 201 fe80::9819:2cff:fe99:472d ifl-0/0/2/0 10201
fe80::9819:2c00:6499:472d ifl-0/0/2/100 10201
IS-IS Segment Routing
Syntax:
| Option | Description |
|---|---|
|
Displays Segment routing global block (SRGB) information |
|
Displays Segment routing global block (SRGB) information for the specified instance |
|
Displays the IS-IS segment routing label bindings information |
|
Displays the IS-IS segment routing label bindings for the specified instance |
|
Displays the IS-IS prefix segments information |
|
Displays the IS-IS prefix segments for the specified instance |
|
Displays the neighbor information for each SID, which helps users identify to which adjacency the SID belongs. |
Example 1: Summary view of the IS-IS segment routing global block
supervisor@rtbrick: op> show isis segment-routing global-block Instance: default, Level: 1 System SRGB Base SRGB Range isr1 10000 1000 isr2 11000 1000 Instance: default, Level: 2 System SRGB Base SRGB Range isr1 10000 1000 isr2 11000 1000
Example 2: Summary view of the IS-IS segment routing label binding
supervisor@rtbrick: op> show isis segment-routing label-binding Instance: default, Level: 1 System Prefix Range SID Flags isr1 198.51.100.11/32 5 100 None
Example 3: Summary view of the IS-IS segment routing prefix segment
supervisor@rtbrick: op> show isis segment-routing prefix-segment Instance: default, Level: 1 System Prefix SID Flags isr1 198.51.100.11/32 100 Node isr1 2001:db8:0:1::11/128 101 Node isr2 198.51.100.21/32 200 Node isr2 2001:db8:0:1::21/128 201 Node Instance: default, Level: 2 System Prefix SID Flags isr1 198.51.100.11/32 100 Node isr1 198.51.100.21/32 200 Re-advertisement, Node isr1 2001:db8:0:1::11/128 101 Node isr1 2001:db8:0:1::21/128 201 Re-advertisement, Node isr2 198.51.100.11/32 100 Re-advertisement, Node isr2 198.51.100.21/32 200 Node isr2 2001:db8:0:1::11/128 101 Re-advertisement, Node isr2 2001:db8:0:1::21/128 201 Node
Example 4: Summary view of the IS-IS segment routing adjacency-segment
supervisor@rtbrick: op> show isis segment-routing adjacency-segment Instance: default, Level: 1 Local System ID Remote System ID Label Interface Flags isr1 isr2 20112 ifl-0/0/2/0 Value, Local, Persistent isr1 isr2 20312 ifl-0/0/2/0 Ipv6 Encapsulation, Value, Local, Persistent isr2 isr1 21121 - Value, Local, Persistent isr2 isr1 21321 - Ipv6 Encapsulation, Value, Local, Persistent Instance: default, Level: 2 Local System ID Remote System ID Label Interface Flags isr1 isr2 20112 ifl-0/0/2/0 Value, Local, Persistent isr1 isr2 20312 ifl-0/0/2/0 Ipv6 Encapsulation, Value, Local, Persistent isr2 isr1 21121 - Value, Local, Persistent isr2 isr1 21321 - Ipv6 Encapsulation, Value, Local, Persistent
IS-IS SPF
Syntax:
| Option | Description |
|---|---|
|
Displays a summary of the IS-IS SPF results |
|
Displays a summary of the IS-IS SPF results for the specified instance |
|
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: op> show isis spf result
Instance: default, Level: 1
Destination Node Metric Neighbor Node Interface Nexthop Address
1980.5110.0111.00 0 local
1980.5110.0121.00 1000000 1980.5110.0121.00 ifl-0/0/2/0 IPv6 fe80::9819:2cff:fe99:472d
1980.5110.0121.00 ifl-0/0/2/100 IPv6 fe80::9819:2c00:6499:472d
1980.5110.0121.00 ifl-0/0/2/0 IPv4 192.0.2.2
1980.5110.0121.00 ifl-0/0/2/100 IPv4 192.0.2.6
1980.5110.0121.01 1000000 local
Instance: default, Level: 2
Destination Node Metric Neighbor Node Interface Nexthop Address
1980.5110.0111.00 0 local
1980.5110.0121.00 1000000 1980.5110.0121.00 ifl-0/0/2/0 IPv6 fe80::9819:2cff:fe99:472d
1980.5110.0121.00 ifl-0/0/2/100 IPv6 fe80::9819:2c00:6499:472d
1980.5110.0121.00 ifl-0/0/2/0 IPv4 192.0.2.2
1980.5110.0121.00 ifl-0/0/2/100 IPv4 192.0.2.6
1980.5110.0121.01 1000000 local
Example 2: Summary view of the IS-IS SPF result for level-1
supervisor@rtbrick: op> show isis spf result level-1
Instance: default, Level: 1
Destination Node Metric Neighbor Node Interface Nexthop Address
1980.5110.0111.00 0 local
1980.5110.0121.00 1000000 1980.5110.0121.00 ifl-0/0/2/0 IPv6 fe80::9819:2cff:fe99:472d
1980.5110.0121.00 ifl-0/0/2/100 IPv6 fe80::9819:2c00:6499:472d
1980.5110.0121.00 ifl-0/0/2/0 IPv4 192.0.2.2
1980.5110.0121.00 ifl-0/0/2/100 IPv4 192.0.2.6
1980.5110.0121.01 1000000 local
Example 3: Summary view of the IS-IS SPF result for level-2
supervisor@rtbrick: op> show isis spf result level-2
Instance: default, Level: 2
Destination Node Metric Neighbor Node Interface Nexthop Address
1980.5110.0111.00 0 local
1980.5110.0121.00 1000000 1980.5110.0121.00 ifl-0/0/2/0 IPv6 fe80::9819:2cff:fe99:472d
1980.5110.0121.00 ifl-0/0/2/100 IPv6 fe80::9819:2c00:6499:472d
1980.5110.0121.00 ifl-0/0/2/0 IPv4 192.0.2.2
1980.5110.0121.00 ifl-0/0/2/100 IPv4 192.0.2.6
1980.5110.0121.01 1000000 local
Example 4: Summary view of the IS-IS SPF result of a specific instance for level-1
supervisor@rtbrick: op> show isis spf result instance default level-1
Instance: default, Level: 1
Destination Node Metric Neighbor Node Interface Nexthop Address
1980.5110.0111.00 0 local
1980.5110.0121.00 1000000 1980.5110.0121.00 ifl-0/0/2/0 IPv6 fe80::9819:2cff:fe99:472d
1980.5110.0121.00 ifl-0/0/2/100 IPv6 fe80::9819:2c00:6499:472d
1980.5110.0121.00 ifl-0/0/2/0 IPv4 192.0.2.2
1980.5110.0121.00 ifl-0/0/2/100 IPv4 192.0.2.6
1980.5110.0121.01 1000000 local
Example 5: Summary view of the IS-IS SPF result of a specific instance for level-2
supervisor@rtbrick: op> show isis spf result instance default level-2
Instance: default, Level: 2
Destination Node Metric Neighbor Node Interface Nexthop Address
1980.5110.0111.00 0 local
1980.5110.0121.00 1000000 1980.5110.0121.00 ifl-0/0/2/0 IPv6 fe80::9819:2cff:fe99:472d
1980.5110.0121.00 ifl-0/0/2/100 IPv6 fe80::9819:2c00:6499:472d
1980.5110.0121.00 ifl-0/0/2/0 IPv4 192.0.2.2
1980.5110.0121.00 ifl-0/0/2/100 IPv4 192.0.2.6
1980.5110.0121.01 1000000 local
IS-IS Clear Commands
Clear commands allow to reset operational states.
IS-IS Interface
Syntax:
| Option | Description |
|---|---|
|
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 statisticsIS-IS Neighbor
Syntax:
| Option | Description |
|---|---|
|
Clears neighbors of the default instance |
|
Clears neighbors of the specified instance |
|
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 To access the Operational State API that corresponds to this CLI, click
include::common:partial$operational_api_links.adoc[tag=clear_isis_neighbor].
IS-IS Database
Syntax:
| Option | Description |
|---|---|
|
Clears neighbors of the default instance |
|
Clears area level-1 |
|
Clears area level-2 |
|
Clears IS-IS database for the specific LSP ID |
|
Clears the LSDB system ID |
Example: The example below shows how to clear the database instance
supervisor@rtbrick>spine1: op> clear isis database instance defaultThe LSDB data is cleared for instance default
IS-IS Level 2 to Level 1 Route Leak
The command displays the IS-IS Route Leak information.
| Option | Description |
|---|---|
|
Name of system. |
Example: The output shows the Level-1 ISIS LSP for isr2 is active and advertises both IPv4 and IPv6 reachability along with segment routing (SRGB base 2000, range 1000). The LSP is attached, authenticated with MD5. Most of the prefixes are 'Up' and a few are marked 'Down'.
supervisor@rtbrick: op> show isis database level-1 system isr2
Instance: default, Level: 1
LSP ID: isr2.00-00
Interface: ifl-0/0/2/0
LSP Header:
Sequence: 0x3
Checksum: 0x1c4
Remaining lifetime: 65535 seconds
Flags: Attached: 0, Overload: 0
Packet:
Length: 248 bytes
Last received time: 2026-06-05T14:46:39.411068+0000
Expiry: expires in 18h 11m 31s 126533us
System ID: 1980.5110.0121
Dynamic Hostname TLV (137): isr2
Protocols Supported TLVs (129):
Network layer protocol ID: IPv6
Network layer protocol ID: IPv4
Area Address TLVs (1):
Area address: 49.0001
Authentication TLV (10):
Type: md5
Value: 1f82cbc53859f87066a51805990662d7
IS Reachability TLVs (22):
IS neighbor: 1980.5110.0111.00 Metric: 1000000
Adjacency SID:
Value: 21121, Flags: Value, Local, Persistent
Value: 21321, Flags: Ipv6 Encapsulation, Value, Local, Persistent
IS neighbor: 1980.5110.0121.01 Metric: 1000000
IPv4 Reachability TLVs (135):
IPv4 prefix: 192.0.2.0/30 Metric: 1000000 Internal Up
IPv4 prefix: 192.0.2.4/30 Metric: 1000000 Internal Up
IPv4 prefix: 198.51.100.21/32 Metric: 1000000 Internal Up SID: 200 Flags: Node
IPv4 prefix: 198.51.100.22/32 Metric: 1000000 Internal Up
IPv6 Reachability TLVs (236):
IPv6 prefix: 2001:db8:1:1::/64 Metric: 1000000 Internal Up
IPv6 prefix: 2001:db8:2:1::/64 Metric: 1000000 Internal Up
IPv6 prefix: 2001:db8:0:1::21/128 Metric: 1000000 Internal Up SID: 201 Flags: Node
IPv6 prefix: 2001:db8:0:1::22/128 Metric: 1000000 Internal Up
Segment Routing TLVs (242/sub 2):
SRGB: Base: 11000, Range: 1000, Router ID: 198.51.100.21
LSP ID: isr2.01-00
Interface: ifl-0/0/2/0
LSP Header:
Sequence: 0x1
Checksum: 0x2cff
Remaining lifetime: 65535 seconds
Flags: Attached: 0, Overload: 0
Packet:
Length: 80 bytes
Last received time: 2026-06-05T14:46:39.411333+0000
Expiry: expires in 18h 11m 31s 126487us
System ID: 1980.5110.0121
Protocols Supported TLVs (129):
Network layer protocol ID: IPv6
Network layer protocol ID: IPv4
Area Address TLVs (1):
Area address: 49.0001
Authentication TLV (10):
Type: md5
Value: d6d4ece4874d0946847e3e9a81621364
IS Reachability TLVs (22):
IS neighbor: 1980.5110.0111.00 Metric: 0
IS neighbor: 1980.5110.0121.00 Metric: 0
Example output for policy configuration that allows only a specific IPv4 route to be leaked from level2 to level1 and blocking the other level 2 route leaking to level 1.
supervisor@rtbrick: op> show isis database level-2 system isr2
Instance: default, Level: 2
LSP ID: isr2.00-00
Interface: ifl-0/0/2/0
LSP Header:
Sequence: 0x6
Checksum: 0x44fc
Remaining lifetime: 65535 seconds
Flags: Attached: 0, Overload: 0
Packet:
Length: 342 bytes
Last received time: 2026-06-05T14:46:40.655342+0000
Expiry: expires in 18h 11m 31s 324474us
System ID: 1980.5110.0121
Dynamic Hostname TLV (137): isr2
Protocols Supported TLVs (129):
Network layer protocol ID: IPv6
Network layer protocol ID: IPv4
Area Address TLVs (1):
Area address: 49.0001
Authentication TLV (10):
Type: md5
Value: cfabe50eef16c90239c4951db3cf2e18
IS Reachability TLVs (22):
IS neighbor: 1980.5110.0111.00 Metric: 1000000
Adjacency SID:
Value: 21121, Flags: Value, Local, Persistent
Value: 21321, Flags: Ipv6 Encapsulation, Value, Local, Persistent
IS neighbor: 1980.5110.0121.01 Metric: 1000000
IPv4 Reachability TLVs (135):
IPv4 prefix: 192.0.2.0/30 Metric: 1000000 Internal Up
IPv4 prefix: 192.0.2.4/30 Metric: 1000000 Internal Up
IPv4 prefix: 198.51.100.11/32 Metric: 2000000 Internal Up SID: 100 Flags: Re-advertisement, Node
IPv4 prefix: 198.51.100.12/32 Metric: 2000000 Internal Up
IPv4 prefix: 198.51.100.21/32 Metric: 1000000 Internal Up SID: 200 Flags: Node
IPv4 prefix: 198.51.100.22/32 Metric: 1000000 Internal Up
IPv6 Reachability TLVs (236):
IPv6 prefix: 2001:db8:1:1::/64 Metric: 1000000 Internal Up
IPv6 prefix: 2001:db8:2:1::/64 Metric: 1000000 Internal Up
IPv6 prefix: 2001:db8:0:1::11/128 Metric: 2000000 Internal Up SID: 101 Flags: Re-advertisement, Node
IPv6 prefix: 2001:db8:0:1::12/128 Metric: 2000000 Internal Up
IPv6 prefix: 2001:db8:0:1::21/128 Metric: 1000000 Internal Up SID: 201 Flags: Node
IPv6 prefix: 2001:db8:0:1::22/128 Metric: 1000000 Internal Up
Segment Routing TLVs (242/sub 2):
SRGB: Base: 11000, Range: 1000, Router ID: 198.51.100.21
LSP ID: isr2.01-00
Interface: ifl-0/0/2/0
LSP Header:
Sequence: 0x1
Checksum: 0x8e6f
Remaining lifetime: 65535 seconds
Flags: Attached: 0, Overload: 0
Packet:
Length: 80 bytes
Last received time: 2026-06-05T14:46:40.655203+0000
Expiry: expires in 18h 11m 31s 324170us
System ID: 1980.5110.0121
Protocols Supported TLVs (129):
Network layer protocol ID: IPv6
Network layer protocol ID: IPv4
Area Address TLVs (1):
Area address: 49.0001
Authentication TLV (10):
Type: md5
Value: 91ab53688ce2b81fe8df7b09f600acd5
IS Reachability TLVs (22):
IS neighbor: 1980.5110.0111.00 Metric: 0
IS neighbor: 1980.5110.0121.00 Metric: 0