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Before BIG-IP GTM can operate as an integrated component within your network, communications must be established between BIG-IP GTM and the other systems with which BIG-IP GTM must exchange information.
BIG-IP systems use an XML protocol named iQuery to communicate with other BIG-IP systems using gzip compression. BIG-IP systems must exchange SSL certificates and be members of the same configuration synchronization group before the systems can share information using iQuery. iqdump is a command you can use to view the data transmitted between systems using iQuery.
The gtmd agent on BIG-IP® Global Traffic Manager™ (GTM™) uses the iQuery® protocol to communicate with the local big3d agent, and the big3d agents installed on other BIG-IP systems. The gtmd agent monitors both the availability of the BIG-IP systems, and the integrity of the network paths between the systems that host a domain and the local DNS servers that attempt to connect to that domain.
The gtm_add utility is designed to be run on a new BIG-IP GTM when you want to install the system on your network, and integrate the system into a previously created configuration synchronization group that includes at least one other BIG-IP GTM.
The big3d_install utility is designed to be run on a new BIG-IP GTM when you want to install the system on a network that includes BIG-IP systems of earlier versions. The big3d_install utility connects to each existing BIG-IP system, extracts the IP addresses of the devices, and automatically updates the big3d agents on all devices.
The bigip_add utility is designed to run on a new BIG-IP GTM when you want to install the system on a network that includes BIG-IP systems of the same version. The bigip_add utility exchanges SSL certificates with each of the other BIG-IP systems to authorize communication between the devices.