Dynamic Reconfiguration

This scenario shows how to create a GRE tunnel and perform some dynamic configuration changes on it.

Test Dynamic Changes On GRE Tunnel

Description

A tunnel interface is configured in each node and the ‘Ping’ command is used to check network connectivity (ICMP protocol). Afterwards, NHRP configuration is replaced by a fixed remote network and ICMP connectivy is checked again. Finally, initial configuration is restored to ensure NHRP is working fine.

Scenario

Step 1: Set the following configuration in DUT0:

set interfaces ethernet eth0 vif 100 address 192.168.100.10/24
set interfaces tunnel tun0 address 100.0.0.1/32
set interfaces tunnel tun0 encapsulation gre
set interfaces tunnel tun0 local-address 192.168.100.10
set interfaces tunnel tun0 nhrp
set protocols static route 0.0.0.0/0 next-hop 192.168.100.20
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Step 2: Set the following configuration in DUT1:

set interfaces ethernet eth0 vif 200 address 192.168.200.10/24
set interfaces tunnel tun0 address 200.0.0.1/32
set interfaces tunnel tun0 encapsulation gre
set interfaces tunnel tun0 local-address 192.168.200.10
set interfaces tunnel tun0 nhrp nhs 100.0.0.1 nbma 192.168.100.10
set protocols static route 0.0.0.0/0 next-hop 192.168.200.20
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Step 3: Set the following configuration in DUT2:

set interfaces ethernet eth0 vif 100 address 192.168.100.20/24
set interfaces ethernet eth1 vif 200 address 192.168.200.20/24
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Step 4: Ping IP address 192.168.200.20 from DUT0:

admin@DUT0$ ping 192.168.200.20 count 1 size 56 timeout 1

Step 5: Run command protocols ip show nhrp at DUT0 and check if output matches the following regular expressions:

tun0\s+dynamic\s+200\.0\.0\.1

Step 6: Ping IP address 200.0.0.1 from DUT0:

admin@DUT0$ ping 200.0.0.1 count 1 size 56 timeout 1

Step 7: Modify the following configuration lines in DUT0:

delete interfaces tunnel tun0 nhrp
set interfaces tunnel tun0 remote-ip 192.168.200.10
set protocols static route 200.0.0.1/32 interface tun0

Step 8: Modify the following configuration lines in DUT1:

delete interfaces tunnel tun0 nhrp
set interfaces tunnel tun0 remote-ip 192.168.100.10
set protocols static route 100.0.0.1/32 interface tun0

Step 9: Ping IP address 200.0.0.1 from DUT0:

admin@DUT0$ ping 200.0.0.1 count 1 size 56 timeout 1

Step 10: Modify the following configuration lines in DUT0:

delete interfaces tunnel tun0 remote-ip
delete protocols static route 200.0.0.1/32
set interfaces tunnel tun0 nhrp

Step 11: Modify the following configuration lines in DUT1:

delete interfaces tunnel tun0 remote-ip
delete protocols static route 100.0.0.1/32
set interfaces tunnel tun0 nhrp nhs 100.0.0.1 nbma 192.168.100.10

Step 12: Run command protocols ip show nhrp at DUT0 and check if output matches the following regular expressions:

tun0\s+dynamic\s+200\.0\.0\.1

Step 13: Ping IP address 200.0.0.1 from DUT0:

admin@DUT0$ ping 200.0.0.1 count 1 size 56 timeout 1