Example: Configuring OSPF on Logical Systems Within the Same Router

Requirements

You must connect the logical systems by using logical tunnel (lt) interfaces. See Example: Connecting Logical Systems Within the Same Router Using Logical Tunnel Interfaces.

Overview

This example shows the configuration of a single OSPF area 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 system interfaces that participate in the OSPF domain and specifies the area that the interfaces are in.

Figure 1 shows the sample network.

Figure 1: OSPF on Logical Systems

Configuration

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, and then copy and paste the commands into the CLI at the [edit] hierarchy level.

Step-by-Step Procedure

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

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

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

   [edit]user@host# set logical-systems LS1 interfaces lt-1/2/0 unit 0 description LS1->LS3 user@host# set logical-systems LS1 interfaces lt-1/2/0 unit 0 encapsulation ethernet user@host# set logical-systems LS1 interfaces lt-1/2/0 unit 0 peer-unit 5 user@host# set logical-systems LS1 interfaces lt-1/2/0 unit 0 family inet address 10.0.1.2/30

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

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

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

   [edit]user@host# set logical-systems LS2 interfaces lt-1/2/0 unit 4 description LS2->LS3 user@host# set logical-systems LS2 interfaces lt-1/2/0 unit 4 encapsulation ethernet user@host# set logical-systems LS2 interfaces lt-1/2/0 unit 4 peer-unit 3 user@host# set logical-systems LS2 interfaces lt-1/2/0 unit 4 family inet address 10.0.2.2/30

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

   [edit]user@host# set logical-systems LS3 interfaces lt-1/2/0 unit 3 description LS3->LS2 user@host# set logical-systems LS3 interfaces lt-1/2/0 unit 3 encapsulation ethernet user@host# set logical-systems LS3 interfaces lt-1/2/0 unit 3 peer-unit 4 user@host# set logical-systems LS3 interfaces lt-1/2/0 unit 3 family inet address 10.0.2.1/30

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

   [edit]user@host# set logical-systems LS3 interfaces lt-1/2/0 unit 5 description LS3->LS1 user@host# set logical-systems LS3 interfaces lt-1/2/0 unit 5 encapsulation ethernet user@host# set logical-systems LS3 interfaces lt-1/2/0 unit 5 peer-unit 0 user@host# set logical-systems LS3 interfaces lt-1/2/0 unit 5 family inet address 10.0.1.1/30

7. Configure OSPF on all the interfaces.

   [edit]user@host# set logical-systems LS1 protocols ospf area 0.0.0.0 interface lt-1/2/0.0 user@host# set logical-systems LS1 protocols ospf area 0.0.0.0 interface lt-1/2/0.2 user@host# set logical-systems LS2 protocols ospf area 0.0.0.0 interface lt-1/2/0.1 user@host# set logical-systems LS2 protocols ospf area 0.0.0.0 interface lt-1/2/0.4 user@host# set logical-systems LS3 protocols ospf area 0.0.0.0 interface lt-1/2/0.5 user@host# set logical-systems LS3 protocols ospf area 0.0.0.0 interface lt-1/2/0.3

8. If you are done configuring the device, commit the configuration.

   [edit]user@host# commit

Results

Confirm your configuration by issuing the show logical-systems command.

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

Make sure that the interfaces are properly configured.

Action

Interface               Admin Link Proto    Local                 Remote
...
lt-1/2/0                up    up  
lt-1/2/0.0              up    up   inet     10.0.1.2/30     
lt-1/2/0.1              up    up   inet     10.0.0.2/30     
lt-1/2/0.2              up    up   inet     10.0.0.1/30     
lt-1/2/0.3              up    up   inet     10.0.2.1/30     
lt-1/2/0.4              up    up   inet     10.0.2.2/30     
lt-1/2/0.5              up    up   inet     10.0.1.1/30     
...

Verifying Connectivity Between the Logical Systems

Purpose

Make sure that the OSPF adjacencies are established by checking the OSPF neighbor tables, checking the routing tables, and pinging the logical systems.

Action

Address          Interface              State     ID               Pri  Dead
10.0.1.1         lt-1/2/0.0             Full      10.0.1.1         128    37
10.0.0.2         lt-1/2/0.2             Full      10.0.0.2         128    33

Address          Interface              State     ID               Pri  Dead
10.0.0.1         lt-1/2/0.1             Full      10.0.0.1         128    32
10.0.2.1         lt-1/2/0.4             Full      10.0.1.1         128    36

Address          Interface              State     ID               Pri  Dead
10.0.2.2         lt-1/2/0.3             Full      10.0.0.2         128    36
10.0.1.2         lt-1/2/0.5             Full      10.0.0.1         128    37

inet.0: 6 destinations, 6 routes (6 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

10.0.0.0/30        *[Direct/0] 00:28:00
                    > via lt-1/2/0.2
10.0.0.1/32        *[Local/0] 00:28:00
                      Local via lt-1/2/0.2
10.0.1.0/30        *[Direct/0] 00:28:00
                    > via lt-1/2/0.0
10.0.1.2/32        *[Local/0] 00:28:00
                      Local via lt-1/2/0.0
10.0.2.0/30        *[OSPF/10] 00:27:05, metric 2
                    > to 10.0.1.1 via lt-1/2/0.0
                      to 10.0.0.2 via lt-1/2/0.2
224.0.0.5/32       *[OSPF/10] 00:28:03, metric 1
                      MultiRecv

inet.0: 6 destinations, 6 routes (6 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

10.0.0.0/30        *[Direct/0] 00:28:31
                    > via lt-1/2/0.1
10.0.0.2/32        *[Local/0] 00:28:32
                      Local via lt-1/2/0.1
10.0.1.0/30        *[OSPF/10] 00:27:38, metric 2
                    > to 10.0.0.1 via lt-1/2/0.1
                      to 10.0.2.1 via lt-1/2/0.4
10.0.2.0/30        *[Direct/0] 00:28:32
                    > via lt-1/2/0.4
10.0.2.2/32        *[Local/0] 00:28:32
                      Local via lt-1/2/0.4
224.0.0.5/32       *[OSPF/10] 00:28:34, metric 1
                      MultiRecv

inet.0: 6 destinations, 6 routes (6 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

10.0.0.0/30        *[OSPF/10] 00:28:23, metric 2
                    > to 10.0.2.2 via lt-1/2/0.3
                      to 10.0.1.2 via lt-1/2/0.5
10.0.1.0/30        *[Direct/0] 00:29:13
                    > via lt-1/2/0.5
10.0.1.1/32        *[Local/0] 00:29:15
                      Local via lt-1/2/0.5
10.0.2.0/30        *[Direct/0] 00:29:14
                    > via lt-1/2/0.3
10.0.2.1/32        *[Local/0] 00:29:15
                      Local via lt-1/2/0.3
224.0.0.5/32       *[OSPF/10] 00:29:16, metric 1
                      MultiRecv

PING 10.0.2.1 (10.0.2.1): 56 data bytes
64 bytes from 10.0.2.1: icmp_seq=0 ttl=64 time=1.215 ms
64 bytes from 10.0.2.1: icmp_seq=1 ttl=64 time=1.150 ms
64 bytes from 10.0.2.1: icmp_seq=2 ttl=64 time=1.134 ms

PING 10.0.0.1 (10.0.0.1): 56 data bytes
64 bytes from 10.0.0.1: icmp_seq=0 ttl=64 time=1.193 ms
64 bytes from 10.0.0.1: icmp_seq=1 ttl=64 time=1.114 ms
64 bytes from 10.0.0.1: icmp_seq=2 ttl=64 time=1.190 ms