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Manual Chapter: Communications Between BIG-IP GTM and Other Systems
Manual Chapter
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About establishing communications between GTM and other systems

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.

About iQuery

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.

Note: BIG-IP systems send iQuery communications only on the VLAN on which the systems receive incoming messages.

About iQuery and communications between BIG-IP systems

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.

Example of communications between big3d and gtmd agents Communications between big3d and gtmd agents using iQuery

Viewing iQuery statistics

Ensure that the BIG-IP® GTM™ configuration contains at least one BIG-IP server object with a self IP address.
To view information about the connections between BIG-IP GTM and other BIG-IP systems, view iQuery® statistics.
  1. On the Main tab, click Statistics > Module Statistics > Global Traffic. The Global Traffic statistics screen opens.
  2. From the Statistics Type list, select iQuery. Information about the iQuery connections between this system and other BIG-IP systems in your network displays.
  3. When you want to estimate iQuery traffic throughput, click Reset. The following statistics are reset to zero:
    • iQuery Reconnects
    • Bytes In
    • Bytes Out
    • Backlogs
    • Bytes Dropped
To view information about the iQuery® connections between a different BIG-IP GTM and the BIG-IP systems in your network, log in to that BIG-IP GTM and repeat this procedure.

About the gtm_add utility

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.

About the big3d_install utility

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.

About the bigip_add utility

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.

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