gtm_add
--> gtm_add takes the GSLB configuration from the remote BIG IP DNS device and replaces it with the GSLB configuration on the Current BIG IP DNS device.
--> GSLB configuration that will be replaced contains following:
1) bigip_gtm.conf ( /config/bigip_gtm.conf)
2) named.conf ( /var/named/config/named.conf)
3) Bind Zone files
--> Uses the SSH port number 22 to exchange the device certificates between the BIG IP DNS devices.
--> Uses the TCP Port number 4353 to copy the GSLB configuration as well Iquery communication between BIG IP DNS devices.
--> The most important thing is you need to execute the command on the device where you do not have any GSLB configuration and want to copy it with the existing GSLB configuration present on the other device.
--> Execute the below command on the BIG IP DNS: (10.0.0.1 is the BIG IP DNS device where actual GSLB configuration is present and it is copied to BIG IP DNS2 device)
BIGIPDNS2# gtm_add 10.0.0.1
big3d_install
--> big3d_install updates the big3d version which is running on the remote BIG IP DNS/LTM device with the big3d version which is currently present on the BIG IP DNS system.
--> big3d_install also allows the exchange of devcie certificates between BIG IP DNS and BIG IP LTM/DNS devices.
--> The big3d_install script copies the current device certificate from /config/big3d/client.crt to the remote BIG IP LTM/DNS device.
--> The big3d_install script copies the remote device certificate to the /config/gtm/server.crt folder of the current BIG IP DNS device.
--> Uses the TCP port number 4353 to perform the above functions, If the TCP port number 4353 is not functional then it uses SSH Port number 22 to perform the task.
--> This script is not required if all of the BIG IP devices are running with an updated big3d agent.
--> The most important thing is you need to execute the command on the device where you do not have an updated big3d agent and want to copy it with the existing BIG IP devices in the network.
--> Execute the below command on the BIG IP DNS: (10.0.0.1 is the BIG IP DNS device where old big3d agent is running and 10.0.0.2 is the BIG IP DNS device where new big3d agent is running)
BIGIPDNS1# big3d_install 10.0.0.2
bigip_add
--> bigip_add script is the light version of big3d_install script.
--> bigip_add script only allows the exchange of device certificates between BIG IP DNS and BIG IP LTM/DNS devices.
--> Iquery communication will not be established until the device certificates are exchanged between the BIG IP devices.
--> The bigip_add script copies the current device certificate from /config/big3d/client.crt to the remote BIG IP LTM/DNS device.
--> The bigip_add script copies the remote device certificate to the /config/gtm/server.crt folder of the current BIG IP DNS device.
--> Uses the SSH Port number 22 to perform the task.
--> Execute the below command on the BIG IP DNS: (10.0.0.1 is the BIG IP DNS device and 10.0.0.2 is the other BIG IP DNS device)
BIGIPDNS1# bigip_add 10.0.0.2
Note: It is recommended to use the Non-Floating Self IP address of the remote device to execute the above scripts.
Reference:F5.com,
MD.Kareemoddin,
CCIE #54759
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