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Table of Contents Expand all

play_arrow Overview
- play_arrow Introduction to IS-IS
play_arrow Configuring IS-IS
play_arrow Monitoring and Troubleshooting Network Issues
- play_arrow Monitoring Networks
- play_arrow Troubleshooting Network Issues
- play_arrow Troubleshooting IS-IS
play_arrow Configuration Statements and Operational Commands
- Junos CLI Reference Overview

list Table of Contents

English

Example: Configuring IS-IS on Logical Systems Within the Same Router

date_range 24-Nov-23

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This example shows how to configure an IS-IS network by using multiple logical systems that are running on a single physical router. The logical systems are connected by logical tunnel interfaces.

Requirements

You must connect the logical systems by using logical tunnel (lt) interfaces. See Example: Connecting Logical Systems Within the Same Device Using Logical Tunnel Interfaces on MX Series Routers and EX Series Switches.

Overview

This example shows an IS-IS configuration with three logical systems running on one physical router. Each logical system has its own routing table. The configuration enables the protocol on all logical tunnel interfaces that participate in the IS-IS domain.

Topology

Figure 1 shows the sample network.

Figure 1: IS-IS on Logical Systems

CLI Quick Configuration

To quickly configure this example, copy the following commands, paste them into a text file, remove any line breaks, change any details necessary to match your network configuration, copy and paste the commands into the CLI at the [edit] hierarchy level, and then enter commit from configuration mode.

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set logical-systems LS1 interfaces lt-0/1/0 unit 2 description LS1->LS2
set logical-systems LS1 interfaces lt-0/1/0 unit 2 encapsulation ethernet
set logical-systems LS1 interfaces lt-0/1/0 unit 2 peer-unit 1
set logical-systems LS1 interfaces lt-0/1/0 unit 2 family inet address 10.0.0.1/30
set logical-systems LS1 interfaces lt-0/1/0 unit 2 family iso
set logical-systems LS1 interfaces lt-0/1/0 unit 0 description LS1->LS3
set logical-systems LS1 interfaces lt-0/1/0 unit 0 encapsulation ethernet
set logical-systems LS1 interfaces lt-0/1/0 unit 0 peer-unit 5
set logical-systems LS1 interfaces lt-0/1/0 unit 0 family inet address 10.0.1.2/30
set logical-systems LS1 interfaces lt-0/1/0 unit 0 family iso
set logical-systems LS1 interfaces lo0 unit 1 family iso address 49.0001.1720.1600.1001.00
set logical-systems LS1 protocols isis interface lt-0/1/0.0
set logical-systems LS1 protocols isis interface lt-0/1/0.2
set logical-systems LS1 protocols isis interface lo0.1 passive
set logical-systems LS2 interfaces lt-0/1/0 unit 1 description LS2->LS1
set logical-systems LS2 interfaces lt-0/1/0 unit 1 encapsulation ethernet
set logical-systems LS2 interfaces lt-0/1/0 unit 1 peer-unit 2
set logical-systems LS2 interfaces lt-0/1/0 unit 1 family inet address 10.0.0.2/30
set logical-systems LS2 interfaces lt-0/1/0 unit 1 family iso
set logical-systems LS2 interfaces lt-0/1/0 unit 4 description LS2->LS3
set logical-systems LS2 interfaces lt-0/1/0 unit 4 encapsulation ethernet
set logical-systems LS2 interfaces lt-0/1/0 unit 4 peer-unit 3
set logical-systems LS2 interfaces lt-0/1/0 unit 4 family inet address 10.0.2.2/30
set logical-systems LS2 interfaces lt-0/1/0 unit 4 family iso
set logical-systems LS2 interfaces lo0 unit 2 family iso address 49.0001.1720.1600.2002.00
set logical-systems LS2 protocols isis interface lt-0/1/0.1
set logical-systems LS2 protocols isis interface lt-0/1/0.4 
set logical-systems LS2 protocols isis interface lo0.2 passive
set logical-systems LS3 interfaces lt-0/1/0 unit 3 description LS3->LS2
set logical-systems LS3 interfaces lt-0/1/0 unit 3 encapsulation ethernet
set logical-systems LS3 interfaces lt-0/1/0 unit 3 peer-unit 4
set logical-systems LS3 interfaces lt-0/1/0 unit 3 family inet address 10.0.2.1/30
set logical-systems LS3 interfaces lt-0/1/0 unit 3 family iso
set logical-systems LS3 interfaces lt-0/1/0 unit 5 description LS3->LS1
set logical-systems LS3 interfaces lt-0/1/0 unit 5 encapsulation ethernet
set logical-systems LS3 interfaces lt-0/1/0 unit 5 peer-unit 0
set logical-systems LS3 interfaces lt-0/1/0 unit 5 family inet address 10.0.1.1/30
set logical-systems LS3 interfaces lt-0/1/0 unit 5 family iso
set logical-systems LS3 interfaces lo0 unit 3 family iso address 49.0001.1234.1600.2231.00
set logical-systems LS3 protocols isis interface lt-0/1/0.5 
set logical-systems LS3 protocols isis interface lt-0/1/0.3
set logical-systems LS3 protocols isis interface lo0.3 passive

Procedure

Step-by-Step Procedure

The following example requires you to navigate various levels in the configuration hierarchy. For information about navigating the CLI, see Using the CLI Editor in Configuration Mode in the CLI User Guide.

To configure IS-IS on logical systems:

Configure the logical tunnel interface on Logical System LS1 connecting to Logical System LS2.

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[edit logical-systems LS1]
user@host# set interfaces lt-0/1/0 unit 2 description LS1->LS2
user@host# set interfaces lt-0/1/0 unit 2 encapsulation ethernet
user@host# set interfaces lt-0/1/0 unit 2 peer-unit 1
user@host# set interfaces lt-0/1/0 unit 2 family inet address 10.0.0.1/30
user@host# set interfaces lt-0/1/0 unit 2 family iso

Configure the logical tunnel interface on Logical System LS1 connecting to Logical System LS3.

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[edit logical-systems LS1]
user@host# set interfaces lt-0/1/0 unit 0 description LS1->LS3
user@host# set interfaces lt-0/1/0 unit 0 encapsulation ethernet
user@host# set interfaces lt-0/1/0 unit 0 peer-unit 5
user@host# set interfaces lt-0/1/0 unit 0 family inet address 10.0.1.2/30
user@host# set interfaces lt-0/1/0 unit 0 family iso

Configure the logical tunnel interface on Logical System LS2 connecting to Logical System LS1.

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[edit logical-systems LS2]
user@host# set interfaces lt-0/1/0 unit 1 description LS2->LS1
user@host# set interfaces lt-0/1/0 unit 1 encapsulation ethernet
user@host# set interfaces lt-0/1/0 unit 1 peer-unit 2
user@host# set interfaces lt-0/1/0 unit 1 family inet address 10.0.0.2/30
user@host# set interfaces lt-0/1/0 unit 1 family iso

Configure the logical tunnel interface on Logical System LS2 connecting to Logical System LS3.

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[edit logical-systems LS2]
user@host# set interfaces lt-0/1/0 unit 4 description LS2->LS3
user@host# set interfaces lt-0/1/0 unit 4 encapsulation ethernet
user@host# set interfaces lt-0/1/0 unit 4 peer-unit 3
user@host# set interfaces lt-0/1/0 unit 4 family inet address 10.0.2.2/30
user@host# set interfaces lt-0/1/0 unit 4 family iso

Configure the logical tunnel interface on Logical System LS3 connecting to Logical System LS2.

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[edit logical-systems LS3]
user@host# set interfaces lt-0/1/0 unit 3 description LS3->LS2
user@host# set interfaces lt-0/1/0 unit 3 encapsulation ethernet
user@host# set interfaces lt-0/1/0 unit 3 peer-unit 4
user@host# set interfaces lt-0/1/0 unit 3 family inet address 10.0.2.1/30
user@host# set interfaces lt-0/1/0 unit 3 family iso

Configure the logical tunnel interface on Logical System LS3 connecting to Logical System LS1.

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[edit logical-systems LS3]
user@host# set interfaces lt-0/1/0 unit 5 description LS3->LS1
user@host# set interfaces lt-0/1/0 unit 5 encapsulation ethernet
user@host# set interfaces lt-0/1/0 unit 5 peer-unit 0
user@host# set interfaces lt-0/1/0 unit 5 family inet address 10.0.1.1/30
user@host# set interfaces lt-0/1/0 unit 5 family iso

Configure the ISO address on the loopback interface for the three logical systems.

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[edit logical-systems LS1]
user@host# set interfaces lo0 unit 1 family iso address 49.0001.1720.1600.1001.00
user@host# set protocols isis interface lo0.1 passive

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[edit logical-systems LS2]
user@host# set interfaces lo0 unit 2 family iso address 49.0001.1720.1600.2002.00
user@host# set protocols isis interface lo0.2 passive

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[edit logical-systems LS3]
user@host# set interfaces lo0 unit 3 family iso address 49.0001.1234.1600.2231.00
user@host# set protocols isis interface lo0.3 passive

Configure IS-IS on all the interfaces.

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[edit logical-systems LS1 protocols isis]
user@host# set interface lt-0/1/0.0
user@host# set interface lt-0/1/0.2

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[edit logical-systems LS2 protocols isis]
user@host# set interface lt-0/1/0.1 
user@host# set interface lt-0/1/0.4

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[edit logical-systems LS3 protocols isis]
user@host# set interface lt-0/1/0.5
user@host# set interface lt-0/1/0.3

If you are done configuring the device, commit the configuration.
```
[edit]
user@host# commit
```

Results

From configuration mode, confirm your configuration by issuing the show logical-systems command. If the output does not display the intended configuration, repeat the instructions in this example to correct the configuration.

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user@host# show logical-systems
LS1 {
    interfaces {
        lt-0/1/0 {
            unit 0 {
                description LS1->LS3;
                encapsulation ethernet;
                peer-unit 5;
                family inet {
                    address 10.0.1.2/30;
                }
                family iso;
            }
            unit 2 {
                description LS1->LS2;
                encapsulation ethernet;
                peer-unit 1;
                family inet {
                    address 10.0.0.1/30;
                }
                family iso;
            }
        }
        lo0 {
            unit 1 {
                family iso {
                    address 49.0001.1720.1600.1001.00;
                }
            }
        }
    }
    protocols {
        isis {
            interface lt-0/1/0.0;
            interface lt-0/1/0.2;
            interface lo0.1 {
                passive;
            }
        }
    }
}
LS2 {
    interfaces {
        lt-0/1/0 {
            unit 1 {
                description LS2->LS1;
                encapsulation ethernet;
                peer-unit 2;
                family inet {
                    address 10.0.0.2/30;
                }
                family iso;
            }
            unit 4 {
                description LS2->LS3;
                encapsulation ethernet;
                peer-unit 3;
                family inet {           
                    address 10.0.2.2/30;
                }                       
                family iso;             
            }                           
        }                               
        lo0 {                           
            unit 2 {                    
                family iso {            
                    address 49.0001.1720.1600.2002.00;
                }                       
            }                           
        }                               
    }                                   
    protocols {                         
        isis {                          
            interface lt-0/1/0.1;       
            interface lt-0/1/0.4;       
            interface lo0.2 {           
                passive;                
            }                           
                                     
        }                               
    }                                   
}                                       
LS3 {                                   
    interfaces {                        
        lt-0/1/0 {                      
            unit 3 {                    
                description LS3->LS2;   
                encapsulation ethernet; 
                peer-unit 4;            
                family inet {           
                    address 10.0.2.1/30;
                }                       
                family iso;             
            }                           
            unit 5 {                    
                description LS3->LS1;   
                encapsulation ethernet; 
                peer-unit 0;            
                family inet {           
                    address 10.0.1.1/30;
                }                       
                family iso;             
            }                           
        }                               
        lo0 {                           
            unit 3 {                    
                family iso {            
                    address 49.0001.1234.1600.2231.00;
                }                       
            }                           
        }                               
    }                                   
    protocols {                         
        isis {                          
            interface lt-0/1/0.3;       
            interface lt-0/1/0.5; 
            interface lo0.3 {           
                passive;                
            }        
        }                               
    }                                   
}              

Verification

Confirm that the configuration is working properly.

Verifying That the Logical Systems Are Up
Verifying Connectivity Between the Logical Systems

Verifying That the Logical Systems Are Up

Purpose
Action

Purpose

Make sure that the interfaces are properly configured.

Action

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user@host> show interfaces terse
Interface               Admin Link Proto    Local                 Remote
...
lt-0/1/0                up    up  
lt-0/1/0.0              up    up   inet     10.0.1.2/30     
                                   iso     
lt-0/1/0.1              up    up   inet     10.0.0.2/30     
                                   iso     
lt-0/1/0.2              up    up   inet     10.0.0.1/30     
                                   iso     
lt-0/1/0.3              up    up   inet     10.0.2.1/30     
                                   iso     
lt-0/1/0.4              up    up   inet     10.0.2.2/30     
                                   iso     
lt-0/1/0.5              up    up   inet     10.0.1.1/30     
                                   iso   
...   

Verifying Connectivity Between the Logical Systems

Purpose
Action

Purpose

Make sure that the IS-IS adjacencies are established by checking the logical system routing entries and by pinging the logical systems.

Action

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user@host> show route logical-system LS1
inet.0: 5 destinations, 5 routes (5 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

10.0.0.0/30        *[Direct/0] 3w0d 01:37:52
                    > via lt-0/1/0.2
10.0.0.1/32        *[Local/0] 3w0d 01:37:52
                      Local via lt-0/1/0.2
10.0.1.0/30        *[Direct/0] 3w0d 01:37:52
                    > via lt-0/1/0.0
10.0.1.2/32        *[Local/0] 3w0d 01:37:52
                      Local via lt-0/1/0.0
10.0.2.0/30        *[IS-IS/15] 3w0d 01:37:13, metric 20
                    > to 10.0.1.1 via lt-0/1/0.0
                      to 10.0.0.2 via lt-0/1/0.2

iso.0: 1 destinations, 1 routes (1 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

49.0001.1720.1600.1001/72                
                   *[Direct/0] 3w0d 01:37:52
                    > via lo0.1

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user@host> show route logical-system LS2
inet.0: 5 destinations, 5 routes (5 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

10.0.0.0/30        *[Direct/0] 3w0d 01:38:01
                    > via lt-0/1/0.1
10.0.0.2/32        *[Local/0] 3w0d 01:38:01
                      Local via lt-0/1/0.1
10.0.1.0/30        *[IS-IS/15] 3w0d 01:37:01, metric 20
                      to 10.0.0.1 via lt-0/1/0.1
                    > to 10.0.2.1 via lt-0/1/0.4
10.0.2.0/30        *[Direct/0] 3w0d 01:38:01
                    > via lt-0/1/0.4
10.0.2.2/32        *[Local/0] 3w0d 01:38:01
                      Local via lt-0/1/0.4

iso.0: 1 destinations, 1 routes (1 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

49.0001.1720.1600.2002/72                
                   *[Direct/0] 3w0d 01:38:01
                    > via lo0.2

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user@host> show route logical-system LS3
inet.0: 5 destinations, 5 routes (5 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

10.0.0.0/30        *[IS-IS/15] 3w0d 01:37:10, metric 20
                      to 10.0.2.2 via lt-0/1/0.3
                    > to 10.0.1.2 via lt-0/1/0.5
10.0.1.0/30        *[Direct/0] 3w0d 01:38:10
                    > via lt-0/1/0.5
10.0.1.1/32        *[Local/0] 3w0d 01:38:11
                      Local via lt-0/1/0.5
10.0.2.0/30        *[Direct/0] 3w0d 01:38:11
                    > via lt-0/1/0.3
10.0.2.1/32        *[Local/0] 3w0d 01:38:11
                      Local via lt-0/1/0.3

iso.0: 1 destinations, 1 routes (1 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

49.0001.1234.1600.2231/72                
                   *[Direct/0] 3w0d 01:38:11
                    > via lo0.3

From LS1, Ping LS3

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user@host> set cli logical-system LS1

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user@host:LS1> ping 10.0.2.1
PING 10.0.2.1 (10.0.2.1): 56 data bytes
64 bytes from 10.0.2.1: icmp_seq=0 ttl=63 time=1.264 ms
64 bytes from 10.0.2.1: icmp_seq=1 ttl=63 time=1.189 ms
64 bytes from 10.0.2.1: icmp_seq=2 ttl=63 time=1.165 ms
^C
--- 10.0.2.1 ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max/stddev = 1.165/1.206/1.264/0.042 ms

From LS3, Ping LS1

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user@host> set cli logical-system LS3

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user@host:LS3> ping 10.0.0.1
PING 10.0.0.1 (10.0.0.1): 56 data bytes
64 bytes from 10.0.0.1: icmp_seq=0 ttl=63 time=1.254 ms
64 bytes from 10.0.0.1: icmp_seq=1 ttl=63 time=1.210 ms
^C
--- 10.0.0.1 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max/stddev = 1.210/1.232/1.254/0.022 ms

From LS1, Ping LS2

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user@host> set cli logical-system LS1

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user@host:LS1> ping 10.0.2.2
PING 10.0.2.2 (10.0.2.2): 56 data bytes
64 bytes from 10.0.2.2: icmp_seq=0 ttl=64 time=1.240 ms
64 bytes from 10.0.2.2: icmp_seq=1 ttl=64 time=1.204 ms
64 bytes from 10.0.2.2: icmp_seq=2 ttl=64 time=1.217 ms
^C
--- 10.0.2.2 ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max/stddev = 1.204/1.220/1.240/0.015 ms

From LS2, Ping LS1

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user@host> set cli logical-system LS2

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user@host:LS2> ping 10.0.1.2
PING 10.0.1.2 (10.0.1.2): 56 data bytes
64 bytes from 10.0.1.2: icmp_seq=0 ttl=64 time=1.308 ms
64 bytes from 10.0.1.2: icmp_seq=1 ttl=64 time=1.235 ms
^C
--- 10.0.1.2 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max/stddev = 1.235/1.272/1.308/0.037 ms

From LS2, Ping LS3

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user@host> set cli logical-system LS2

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user@host:LS2> ping 10.0.1.1
PING 10.0.1.1 (10.0.1.1): 56 data bytes
64 bytes from 10.0.1.1: icmp_seq=0 ttl=64 time=1.253 ms
64 bytes from 10.0.1.1: icmp_seq=1 ttl=64 time=1.194 ms
64 bytes from 10.0.1.1: icmp_seq=2 ttl=64 time=1.212 ms
64 bytes from 10.0.1.1: icmp_seq=3 ttl=64 time=1.221 ms
64 bytes from 10.0.1.1: icmp_seq=4 ttl=64 time=1.195 ms
^C
--- 10.0.1.1 ping statistics ---
5 packets transmitted, 5 packets received, 0% packet loss
round-trip min/avg/max/stddev = 1.194/1.215/1.253/0.022 ms

From LS3, Ping LS2

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user@host> set cli logical-system LS3

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user@host:LS3> ping 10.0.0.2
PING 10.0.0.2 (10.0.0.2): 56 data bytes
64 bytes from 10.0.0.2: icmp_seq=0 ttl=64 time=1.240 ms
64 bytes from 10.0.0.2: icmp_seq=1 ttl=64 time=1.217 ms
^C
--- 10.0.0.2 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max/stddev = 1.217/1.228/1.240/0.012 ms

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IS-IS User Guide

ON THIS PAGE

Example: Configuring IS-IS on Logical Systems Within the Same Router

Requirements

Overview

Topology

Configuration

CLI Quick Configuration

Procedure

Step-by-Step Procedure

Results

Verification

Verifying That the Logical Systems Are Up

Purpose

Action

Verifying Connectivity Between the Logical Systems

Purpose

Action

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IS-IS User Guide

ON THIS PAGE

Example: Configuring IS-IS on Logical Systems Within the Same Router

Requirements

Overview

Topology

Configuration

CLI Quick Configuration

Procedure

Step-by-Step Procedure

Results

Verification

Verifying That the Logical Systems Are Up

Purpose

Action

Verifying Connectivity Between the Logical Systems

Purpose

Action

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