1. Introduction to RBFS IS-IS
The RtBrick Full Stack (RBFS) is a distributed, web-scale network operating system based on micro-service architecture and packaged in a Linux container currently based on Ubuntu 18.04. The RBFS decreases the complexity of a network by providing users with capabilities such as composability, programmability, and elasticity in a visionary way.
The RBFS operating system operates on the leaf and spine framework. This framework provides the network operators with methods to configure and manage a network brick by brick, and provides full control of the network so the focus can be on the deployment of the new services and not the constant juggling of hardware. The Intermediate System-to-Intermediate System (IS-IS) protocol is an interior gateway protocol (IGP) that uses link-state information to make routing decisions.
1.1. IS-IS CLI Overview
This guide provides the various IS-IS configuration and show CLI commands for RBFS. It shows you how to configure IS-IS using the confd daemon, view the command hierarchy, and make configuration changes.
2. RBFS IS-IS Instance Hierarchy
The RBFS uses a distinct hierarchy for the IS-IS statements and commands. When installed, the RBFS runs a default instance named “default.”
You can apply IS-IS configuration statements and commands at the instance, address family, or protocol IS-IS hierarchy level.
The figure below shows the IS-IS command hierarchy:
The table below shows the IS-IS configuration modes and CLI prompts:
Configuration Mode | Prompt |
---|---|
Root |
|
Instance |
|
Interface |
|
Interface level [level-1 | level-2] |
|
Address Family [ipv4 | ipv6] |
|
Redistribute |
|
2.1. Modes and Commands
All edit and set operations are performed through the configuration daemon CONFD. Their end result is similar, but the terms apply to slightly different configuration methods:
-
Mode: An “edit” is used to provide a hierarchical configuration option for the module instance.
-
Commands: A “set” is used to set the statement parameters and attributes for the module instance.
In a typical configuration session, you will use both methods.
Syntax
root@is-is-router:confd> edit instance red [ instance red ] root@is-is-router:confd> edit protocol isis [ instance red protocol isis ]
You can execute the exit command to exit the current level of the statement hierarchy, returning to the level prior to the last edit command. To exit from the configuration mode, enter the end and exit commands. |
2.2. IS-IS Instance
To enter into the IS-IS default instance mode, enter the following command:
root@rta:confd> edit instance protocol isis [ instance protocol isis ] root@rta:confd>
2.3. Interface
In this mode, you can configure the interface-specific IS-IS properties.
Example (Default Instance)
root@is-is-router:confd> edit interface twc-0/0/1/2/1 [ instance protocol isis interface twc-0/0/1/2/1 ] root@rta:confd>
Example (VRF Instance)
root@is-is-router:confd> edit interface twc-0/0/1/2/1 [ instance red protocol isis interface twc-0/0/1/2/1 ] root@rta:confd>
2.4. Level (IS-IS Interfaces)
The level mode enables you to configure the IS-IS operational characteristics of the interface at Level 1 and/or Level 2. Level 1 and Level 2 can be configured inside a logical interface. By default, an interface operates in both Level 1 and Level 2 modes.
-
Level 1: Specifies the IS-IS operational characteristics of the interface at level 1.
-
Level 2: Specifies the IS-IS operational characteristics of the interface at level 2.
Example (Default Instance)
root@is-is-router:confd> edit level-1 [ instance protocol isis interface twc-0/0/1/2/1 level-1 ] root@is-is-router:confd> edit level-2 [ instance protocol isis interface twc-0/0/1/2/1 level-2 ]
Example (VRF Instance)
root@is-is-router:confd> edit level-1 [ instance red protocol isis interface twc-0/0/1/2/1 level-1 ] root@is-is-router:confd> edit level-2 [ instance red protocol isis interface twc-0/0/1/2/1 level-2 ]
2.5. Redistribute
IS-IS determines support for route redistribution based on address family. The selected address family can redistribute local interface routes, static routes, routes learned by IS-IS, and so on.
The examples below show the route redistribution options:
Example (Default Instance)
root@isr1:confd> edit instance protocol isis address-family ipv4 unicast [ instance protocol isis address-family ipv4 unicast ] root@isr1:confd>
Example (VRF Instance)
root@ is-is-router:confd> edit instance vrf1 instance vrf1 ] root@ is-is-router:confd> edit address-family ipv4 unicast [ instance vrf1 address-family ipv4 unicast ]
3. IS-IS Instance Configuration Commands
This section describes the commands used to configure IS-IS in an instance.
3.1. IS-IS Instance
To enter into the IS-IS default instance mode configuration mode, enter the following command:
root@rta:confd> edit instance protocol isis [ instance protocol isis ] root@rta:confd>
Example
root@isr1:confd> edit instance protocol isis [ instance protocol isis ] root@isr1:confd> root@isr1:confd> set address-family Address family config area ISO area holding-time ISIS neighbor hold time hostname ISIS System Host Name interface Interface Configuration lsp LSP Flooding Related Configuration overload Set ISIS Overload bit in LSP system-id ISO system id associated with the system [ instance protocol isis ] root@isr1:confd>
3.2. area
This command specifies the ISO area.
Syntax
Command arguments
<area> |
The area can be represented in 1, 3, 5, 13 bytes format. |
Example
root@rta:confd> edit instance protocol isis root@rta:confd> set area 49.0001/24
3.3. holding-time
This command sets the adjacency expiry interval. This is a global setting for the instance.
Syntax
Command arguments
<seconds> |
Specifies the adjacency expiry and the hello interval time in seconds. Default value: 30 seconds Range: 1 through 65535 seconds Note: You need to adjust the hold time configuration for stable operations. |
Example
root@rta:confd> edit instance protocol isis root@rta:confd> set holding-time 30000
3.4. lsp lifetime
This command sets the link-state PDU (LSP) lifetime, after which the LSP expires.
Syntax
Command arguments
<seconds> |
Specifies the LSP lifetime in seconds. Default value: 20 seconds Range: 5 through 65535 seconds |
Example
root@rta:confd> edit instance protocol isis root@rta:confd> set lsp lifetime 30000
3.5. hostname
This command sets the IS-IS hostname of the node.
Syntax
Command arguments
<name> |
Specifies the IS-IS hostname of the node. |
Example
root@rta:confd> edit instance protocol isis root@rta:confd> set hostname rta
3.6. overload
This command sets the IS-IS overload bit in a link-state PDU (LSP).
Syntax
Example
root@rta:confd> edit instance protocol isis root@rta:confd> set overload
3.7. system-id
This command sets the ISO system ID.
Syntax
Command arguments
<system ID> |
Six-byte value that identifies a system in an area. |
Example
root@rta:confd> edit instance protocol isis root@rta:confd> set system-id 1921.0000.1001
4. IS-IS Interface Configuration Commands
This section describes the IS-IS interface mode configuration commands.
4.1. interface-type
This command sets the interface type. You can execute this command from the Instance mode.
Syntax
Command arguments
<interface-type> |
Specifies the interface type. Note: The point-to-point is the default interface type and hence you actually do not need to configure it. |
Example
root@isr1:confd> edit instance protocol isis interface twc-0/0/1/2/1 [ instance protocol isis interface twc-0/0/1/2/1 ] [ instance protocol isis interface twc-0/0/1/2/1 ] root@isr1:confd> set interface-type point-to-point
4.2. passive
This command sets the interface in passive mode. In this mode, no IS-IS hello packets are sent out on the interface and no IS-IS adjacencies are created. But the IP prefixes will be mentioned in the self LSP to make the network reachable via other links. You can execute this command from the interface mode.
Syntax
Example
root@isr1:confd> edit instance protocol isis interface twc-0/0/1/2/1 [ instance protocol isis interface twc-0/0/1/2/1 ] root@isr1:confd> set passive
5. IS-IS Level (Interface) Configuration Commands
This section describes the IS-IS interface level configuration mode commands.
5.1. level-1 disable
This command disables level-1 adjacencies on an interface. By default, it is enabled. You can execute this command from the interface level mode.
Syntax
Example
root@isr1:confd> edit instance protocol isis interface twc-0/0/1/2/1 level-1 [ instance protocol isis interface twc-0/0/1/2/1 level-1 ] root@isr1:confd> set disable
5.2. level-2 disable
This command disables the level-2 adjacencies on an interface. By default, it is enabled. You can execute this command from the interface level mode.
Syntax
Example
root@isr1:confd> edit instance protocol isis interface twc-0/0/1/2/1 level-2 [ instance protocol isis interface twc-0/0/1/2/1 level-2 ] root@isr1:confd> set disable
5.3. level-1 metric
This command sets the interface level-1 metric value. If the metric value is not set, the default value is set to 1000000. You can execute this command from the interface level mode.
Syntax
Command arguments
<metric value> |
This option sets the level-1 metric value. Default Value: 1000000 |
Example
[ instance protocol isis interface twc-0/0/1/2/1 ] root@isr1:confd> set level-1 metric 10
5.4. level-2 metric
This command sets the interface level-2 metric value. If the metric value is not set, the default value is set to 1000000. You can execute this command from the interface level mode.
Syntax
Command arguments
<metric value> |
Specifies the level-2 metric value. Default Value: 1000000 |
Example
[ instance protocol isis interface twc-0/0/1/2/1 ] root@isr1:confd> set level-2 metric 10
6. IS-IS Redistribute Configuration Commands
This section describes the IS-IS redistribute configuration commands.
6.1. redistribute source
This command redistributes route from a selected source into a selected IS-IS level database. This configuration command can be executed from the redistribute or address family modes.
Syntax
Command arguments
<source> |
Specifies the source from which the routes are to be redistributed from. The available options are bgp, ospf, direct, and static. |
level-1 | level-2 |
Specifies the IS-IS level database into which the selected routes will be redistribute to. |
Example
root@isr1:confd> edit instance protocol isis address-family ipv4 unicast [ instance protocol isis address-family ipv4 unicast ] root@isr1:confd> set r source Source to be distibuted [<Enter>] Execute the command [ instance protocol isis address-family ipv4 unicast ] root@isr1:confd> set redistribute sou bgp <source> direct <source> ospf <source> static <source> [ instance protocol isis address-family ipv4 unicast ] root@isr1:confd> set redistribute source st level-1 <dest-sub-type> level-2 <dest-sub-type> [ instance protocol isis address-family ipv4 unicast ] root@isr1:confd> set redistribute source static into isis level-1
7. IS-IS Show Commands for IOD
Configuration statements can be shown to be working properly using show commands. IS-IS is implemented in two modules: IOD and APPD.
This section details the fields displayed by IS-IS show commands handled by the IOD module.
7.1. show isis neighbors
This command shows the summary of the IS-IS neighbors.
Syntax
Command arguments
<instance name> |
Displays the neighbors in the specified instance. By default, the neighbors in the default instance are shown. |
Example (default instance)
ubuntu@isr1:~$ rtb isis.iod.1 show isis neighbors ISIS neighbor information summary for the mentioned instance is given below: Instance: default Interface System Level State Type UP from Expires in twc-0/0/1/2/1 1921.6800.1002 L1 Up P2P 0d:1h:3m:32s expires in 28s 38... twc-0/0/1/3/1 1921.6800.1003 L1 Up P2P 0d:1h:2m:40s expires in 20s 22... ubuntu@isr1:~$
Output Fields
Name | Description |
---|---|
Interface |
Name of the interface on which the neighbor is identified |
System |
System ID of the neighbor |
Level |
Specifies the interface level (1, 2) |
State |
State of the IS-IS neighbor (Up, Down, etc.) |
Type |
Type of the adjacency on which neighbor is identified |
UP from |
The time for which session is in UP state |
Expires in |
Number of seconds until adjacency expires |
Example (vrf instance)
ubuntu@bangalore:~$ rtb isis.iod.1 show isis neighbors instance isisvrf ISIS neighbor information summary for the mentioned instance is given below: Instance: isisvrf Interface System Level State Type UP from Expires in ifl-0/0/2/1/1 1921.6800.1001 L1L2 Down P2P 0d:0h:0m:0s expires in 49710d... ifl-0/0/2/1/1 1921.6800.1002 L1L2 Up P2P 0d:0h:3m:48s expires in 24s 77...
7.2. show isis neighbors detail
This command shows the detailed information about the IS-IS neighbors.
Syntax
Command arguments
<instance name> |
Displays the neighbors in the specified instance. By default, the neighbors in the default instance are shown. |
Example
ubuntu@isr1:~$ rtb isis.iod.1 show isis neighbors detail Neighbor System ID: 1921.6800.1002, Interface: twc-0/0/1/2/1 State: Up, Level: L1, Adjacency type: P2P Holding time: 30, Expiry time: 24s 640162us Local IPv4 address: 12.1.1.1, Remote IPv4 address: 12.1.1.2 Local IPv6 address: fe80::2:0:faff:febd:1020, Remote IPv6 address: fe80::2:0:faff:febd:2010 Last Down Reason: Parameter change Neighbor Up Since: 0d:1h:5m:54s Last transition times: Last transition time: 2019-11-13T14:14:09.250134+0530 Neighbor System ID: 1921.6800.1003, Interface: twc-0/0/1/3/1 State: Up, Level: L1, Adjacency type: P2P Holding time: 30, Expiry time: 20s 404566us Local IPv4 address: 13.1.1.1, Remote IPv4 address: 13.1.1.2 Local IPv6 address: fe80::2:0:faff:febd:1030, Remote IPv6 address: fe80::2:0:faff:febd:3010 Last Down Reason: Parameter change Neighbor Up Since: 0d:1h:5m:2s Last transition times: Last transition time: 2019-11-13T14:15:01.717950+0530
Output Fields
Name | Description |
---|---|
Interface |
Interface through which the neighbor is reachable |
Neighbor System ID |
System ID of the neighbor |
Level |
Level negotiated for neighbor
|
State |
State of the IS-IS neighbor |
Adjacency type |
Adjacencies established on the interface. The value is P2P. |
Type |
Type of the adjacency on which neighbor is identified |
Last Down Reason |
Reason the adjacency is down |
Neighbor Up Since |
The time for which session is in UP state |
Expiry time |
The time after which the session expires |
Holding time |
The adjacency expiry interval configured |
Local IPv4 address |
Local IP address from matching subnet with neighbor |
Remote IPv4 address |
Remote IP address from matching subnet with neighbor |
Local IPv6 address |
Local IPv6 address from matching subnet with neighbor |
Remote IPv6 address |
Remote IPv6 address from matching subnet with neighbor |
7.3. show isis interface
This command shows the summary of IS-IS interfaces.
Syntax
Command arguments
<instance name> |
Displays the neighbors in the specified instance. By default, the neighbors in the default instance is shown. |
Example
ubuntu@isr1:~$ rtb isis.iod.1 show isis interface ISIS interface information summary for the mentioned instance is given below: Instance: default Interface Level Adjacencies Metric Type Passive twc-0/0/1/2/1 1 1 10 point-to-point false twc-0/0/1/2/1 2 1 10 point-to-point false twc-0/0/1/3/1 1 1 10 point-to-point false twc-0/0/1/3/1 2 1 10 point-to-point false ubuntu@isr1:~$
Output Fields
Name | Description |
---|---|
Interface |
Interface configured for IS-IS |
Level |
Configured level of IS-IS
|
Adjacencies |
Number of neighbors in UP state |
Type |
Type of the interface, that is, point-to-point |
Metric |
Metric configured on the interface |
Passive |
Interface passive state |
7.4. show isis interface level
This command shows the detailed information of a specific IS-IS interface per level.
Syntax
Command arguments
<interface name> |
Interface configured for IS-IS Level |
Example
ubuntu@isr1:~$ rtb isis.iod.1 show isis interface twc-0/0/1/2/1 level-1 Interface: twc-0/0/1/2/1, Level: 1 Adjacencies: 1, Metric: 10, Interface type: point-to-point Local Circuit ID: 1, Passive: false CSNP : In: 10 , Out: 113 , Fail: 0 PSNP : In: 6 , Out: 6 , Fail: 0 LSP : In: 8 , Out: 6 , Fail: 0 , Processed: 3 , Purge In: 0 IIH : In: 413 , Out: 416 ubuntu@isr1:~$ rtb isis.iod.1 show isis interface twc-0/0/1/2/1 level-2 Interface: twc-0/0/1/2/1, Level: 2 Adjacencies: 1, Metric: 10, Interface type: point-to-point Local Circuit ID: 1, Passive: false CSNP : In: 46 , Out: 113 , Fail: 0 PSNP : In: 4 , Out: 9 , Fail: 0 LSP : In: 12 , Out: 4 , Fail: 0 , Processed: 10 , Purge In: 0 IIH : In: 32 , Out: 418 ubuntu@isr1:~$
Output Fields
Name | Description |
---|---|
Interface |
Name of the interface on which IS-IS is configured |
Level |
Configured level of IS-IS
|
Adjacencies |
Number of neighbors in UP state |
Interface type |
Type of the interface - point-to-point |
Metric |
Metric configured on the interface |
Passive |
Interface passive state |
CSNP In |
Count of incoming CSNP packets on that interface for the specified level |
CSNP Out |
Count of outgoing CSNP packets on that interface for the specified level |
CSNP Fail |
Count of failed parse cases for CSNP packets on that interface for the specified level |
PSNP In |
Count of incoming PSNP packets on that interface for the specified level |
PSNP Out |
Count of outgoing PSNP packets on that interface for the specified level |
PSNP Fail |
Count of failed parse cases for Partial Sequence Number Packets (PSNP) on that interface for the specified level |
LSP In |
Count of incoming LSP packets on that interface for the specified level |
LSP Out |
Count of outgoing LSP packets on that interface for the specified Level |
LSP Fail |
Count of failed parse cases for LSP packets on that interface for the specified level |
LSP Processed |
Count of non-duplicate LSP packets processed on that interface for the specified level |
LSP Purge In |
Count of LSP purge packets processed on that interface for the specified level |
IIH In |
Count of incoming IS-IS Hello (IIH) packets on that interface for the specified level |
IIH Out |
Count of outgoing IIH packets on that interface for the specified level |
7.5. show isis lsp database
This command shows the IS-IS LSP database summary for L1 and L2.
Syntax
Command arguments
<instance name> |
Displays the neighbors in the specified instance. By default, the neighbors in the default instance are displayed. |
Example
ubuntu@isr1:~$ rtb isis.iod.1 show isis lsp database ISIS database summary for the mentioned instance is given below: Instance: default Level: 1 ID Level Sequence Checksum Lifetime Expiry Status Purged 1921.6800.1001.00-00 1 7 52839 65535 expires in 17h 3m 57s 96564... 1921.6800.1002.00-00 1 5 36037 65534 expires in 17h 3m 5s 685363us 1921.6800.1003.00-00 1 5 41602 65534 expires in 17h 3m 57s 97062... ISIS database summary for the mentioned instance is given below: Instance: default Level: 2 ID Level Sequence Checksum Lifetime Expiry Status Purged 1921.6800.1001.00-00 2 12 24073 65535 expires in 17h 4m 81219us 1921.6800.1002.00-00 2 13 48990 65526 expires in 17h 3m 58s 87700... 1921.6800.1003.00-00 2 13 11067 65526 expires in 17h 3m 58s 87703... 1921.6800.1004.00-00 2 5 58170 65434 expires in 16h 57m 27s 4173... 1921.6800.1005.00-00 2 5 26798 65494 expires in 16h 57m 27s 4105... 1921.6800.1006.00-00 2 5 60451 65454 expires in 16h 57m 27s 4260... ubuntu@isr1:~$
Output Fields
Name | Description |
---|---|
ID |
The LSP identifier |
Level |
Configured level of IS-IS
|
Sequence |
Sequence number of LSP |
Checksum |
Checksum of the entire LSP packet |
Lifetime |
Link-state PDU lifetime, in seconds |
Expiry Status |
Time after which LSP expires |
Purged |
This field is set if the LSP is in purge holddown mode |
7.6. show isis lsp database level
This command shows the IS-IS Link State Database (LSDB) summary for a specific level (level-1 or level-2).
Syntax
Command arguments
level-1 | level-2 |
This option will select the level database to be displayed. |
<instance name> |
This option will list the neighbors in the specified instance. By default, the neighbors in the default instance is shown. |
Example
ubuntu@isr1:~$ rtb isis.iod.1 show isis lsp database level-1 ISIS database summary for the mentioned instance is given below: Instance: default Level: 1 ID Level Sequence Checksum Lifetime Expiry Status Purged 1921.6800.1001.00-00 1 3 44687 65535 expires in 18h 4m 59s 88463us 1921.6800.1002.00-00 1 3 17129 65534 expires in 18h 4m 58s 61250... 1921.6800.1003.00-00 1 3 21971 65533 expires in 18h 4m 58s 23672... ubuntu@isr1:~$
Output Fields
Name | Description |
---|---|
ID |
The LSP identifier |
Level |
Configured level of IS-IS
|
Sequence |
Sequence number of LSP |
Checksum |
Checksum of the entire LSP packet |
Lifetime |
Link-state PDU lifetime, in seconds |
Expiry status |
Time after which LSP expires |
7.7. show isis lsp database level detail
This command shows the actual content of the link state database.
Syntax
Command arguments
level-1 | level-2 |
This option will select the level database to be displayed. |
<instance name> |
This option will list the neighbors in the specified instance. By default, the neighbors in the default instance is shown. |
Example
ubuntu@isr1:~$ rtb isis.iod.1 show isis lsp database level-1 detail LSP ID: 1921.6800.1001.00-00, Level: 1 Sequence no: 3, Checksum: 44687, Remaining Lifetime: 65535 Attached bit: 0, Overload bit: 0 Last received time: 2019-11-18T17:31:37.083306+0530 Expiry time: expires in 18h 8m 24s 123427us Supported Protocols: Protocol supported: IPv6 Protocol supported: IPv4 Neighbor List: Node ID: 1921.6800.1002.00, Metric: 10 IPv4 Prefix List: Prefix: 12.1.1.0/24, Metric: 10 Prefix: 1.1.1.1/32, Metric: 10 IPv6 Prefix List: LSP ID: 1921.6800.1002.00-00, Level: 1 Sequence no: 3, Checksum: 17129, Remaining Lifetime: 65534 Attached bit: 0, Overload bit: 0 Last received time: 2019-11-18T17:31:37.607666+0530 Expiry time: expires in 18h 8m 23s 647289us Supported Protocols: Protocol supported: IPv6 Protocol supported: IPv4 Neighbor List: Node ID: 1921.6800.1001.00, Metric: 10 Node ID: 1921.6800.1003.00, Metric: 10 IPv4 Prefix List: Prefix: 12.1.1.0/24, Metric: 10 Prefix: 23.1.1.0/24, Metric: 10 Prefix: 2.2.2.2/32, Metric: 10 IPv6 Prefix List: LSP ID: 1921.6800.1003.00-00, Level: 1 Sequence no: 3, Checksum: 21971, Remaining Lifetime: 65533 Attached bit: 0, Overload bit: 0 Last received time: 2019-11-18T17:31:38.232094+0530 Expiry time: expires in 18h 8m 23s 271164us Supported Protocols: Protocol supported: IPv6 Protocol supported: IPv4 Neighbor List: Node ID: 1921.6800.1002.00, Metric: 10 IPv4 Prefix List: Prefix: 23.1.1.0/24, Metric: 10 Prefix: 3.3.3.3/32, Metric: 10 IPv6 Prefix List: ubuntu@isr1:~$
Output Fields
Name | Description |
---|---|
ID |
The LSP identifier |
Level |
Configured level of IS-IS
|
Sequence |
Sequence number of LSP |
Checksum |
Checksum of the entire LSP packet |
Remaining Lifetime |
Link-state PDU lifetime, in seconds |
Expiry status |
Time after which LSP expires |
8. IS-IS Show Commands for APPD
This section details the fields displayed by IS-IS show commands handled by the APPD module.
8.1. show isis spf-results level
This command shows the IS-IS SPF results for a specific level and topology.
Syntax
Command arguments
level-1 | level-2 |
Displays the configured level of IS-IS
|
<instance name> |
Displays the neighbors in the specified instance. By default, the neighbors in the default instance is shown. |
ipv4-unicast | ipv6-unicast |
This option will select the topology |
Example
ubuntu@isr1:~$ rtb isis.appd.1 show isis spf-results level level-1 topology ipv4-unicast Node Metric Nexthop 1921.6800.1001.00 0 via local 1921.6800.1002.00 10 12.1.1.2 via twc-0/0/1/2/1 1921.6800.1003.00 10 13.1.1.2 via twc-0/0/1/3/1 ubuntu@isr1:~$
Output Fields
Name | Description |
---|---|
Node |
IS-IS Node ID |
Metric |
Metric value associated with the route |
Nexthop |
Displays the nexthop IP address |
8.2. show isis routes
This command shows the IS-IS routes for the selected topology.
Syntax
Command arguments
<instance name> |
Displays the neighbors in the specified instance. By default, the neighbors in the default instance are displayed. |
ipv4-unicast | ipv6-unicast |
This option will select the topology. |
Example
ubuntu@isr1:~$ rtb isis.appd.1 show isis routes ipv4-unicast summary Prefix Metric Source Nexthop 12.1.1.0/24 10 isis via local 13.1.1.0/24 10 isis via local 23.1.1.0/24 20 isis 12.1.1.2 via twc-0/0/1/2/1 24.1.1.0/24 20 isis 12.1.1.2 via twc-0/0/1/2/1 25.1.1.0/24 20 isis 12.1.1.2 via twc-0/0/1/2/1 26.1.1.0/24 20 isis 12.1.1.2 via twc-0/0/1/2/1 1.1.1.1/32 10 isis via local 2.2.2.2/32 20 isis 12.1.1.2 via twc-0/0/1/2/1 3.3.3.3/32 20 isis 13.1.1.2 via twc-0/0/1/3/1 4.4.4.4/32 30 isis 12.1.1.2 via twc-0/0/1/2/1 5.5.5.5/32 30 isis 12.1.1.2 via twc-0/0/1/2/1 6.6.6.6/32 30 isis 12.1.1.2 via twc-0/0/1/2/1 ubuntu@isr1:~$
Output Fields
Name | Description |
---|---|
Prefix |
The IPv4/IPv6 prefix and mask |
Metric |
Metric value associated with the route |
Source |
Source of the route. This value is always IS-IS. |
Nexthop |
Displays the nexthop IP address |
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