Modify local traffic policy from CLI or API

As I said, you can do it with "merge" command.

One example.

1.- Take the current config of nodes with "tmsh list ltm node".

# tmsh list ltm node
ltm node N-WEB1_172.16.100.1 {
    address 172.16.100.1
}

2.- Use notepad to duplicate and modify this config.

ltm node N-WEB2_172.16.100.2 {
    address 172.16.100.2
}
ltm node N-WEB3_172.16.100.3 {
    address 172.16.100.3
}
ltm node N-WEB4_172.16.100.4 {
    address 172.16.100.4
}

3.- Verify that the config is well-written and valid (paste config after executing the command and press CTRL+D).

# tmsh load sys config merge from-terminal verify 
Enter configuration. Press CTRL-D to submit or CTRL-C to cancel.
ltm node N-WEB2_172.16.100.2 {
    address 172.16.100.2
}
ltm node N-WEB3_172.16.100.3 {
    address 172.16.100.3
}
ltm node N-WEB4_172.16.100.4 {
    address 172.16.100.4
}
Validating configuration...

4.- Finally apply configuration (paste config after executing the command and press CTRL+D).

# tmsh load sys config merge from-terminal 
Enter configuration. Press CTRL-D to submit or CTRL-C to cancel.
ltm node N-WEB2_172.16.100.2 {
    address 172.16.100.2
}
ltm node N-WEB3_172.16.100.3 {
    address 172.16.100.3
}
ltm node N-WEB4_172.16.100.4 {
    address 172.16.100.4
}
Loading configuration...

5.- Verify that the config was applied correctly.

# tmsh list ltm node
ltm node N-WEB1_172.16.100.1 {
    address 172.16.100.1
}
ltm node N-WEB2_172.16.100.2 {
    address 172.16.100.2
}
ltm node N-WEB3_172.16.100.3 {
    address 172.16.100.3
}
ltm node N-WEB4_172.16.100.4 {
    address 172.16.100.4
}

6. Save current config into the startup-config.

# tmsh save sys config
Saving running configuration...
  /config/bigip.conf
  /config/bigip_base.conf
  /config/bigip_user.conf
Saving Ethernet mapping...done

Let me know if this helps.

KR,

Dario.

Thank you for the examples!

I haven't read the whole article yet but was assuming I needed to create a file on the F5 with my modified config snippet. The from-terminal option makes it even better.

Hello Dave.

BTW, if you want it's even possible to execute "merge" command through API REST.

URL: https://bigiphostname/mgmt/tm/sys/config
Method: POST
Payload: {“command”:”load”, “options”:[{“file”: “/var/config/rest/downloads/uploaded_file_name”, “merge”:true}]}

But if you are not familiar with iControl REST, I recommend you to use the TMSH command because it's easier.

REF - https://devcentral.f5.com/s/articles/demystifying-icontrol-rest-merging-big-ip-config-files-19636

If my reply suits you, please don't forget to mark the answer as "the best". Thanks.

KR,

Dario.