# tmsh config explainer > Paste a BIG-IP bigip.conf snippet and get a plain-English breakdown of every object, plus the structure, entirely in your browser. - Tool: https://ronutz.com/en/tools/f5-tmsh-config-explainer - Family: Networking --- ## What it does Paste a snippet of a BIG-IP `bigip.conf` and the tool parses it and explains every object in plain language, along with the structure that holds them together. It reads the configuration only, entirely in your browser; it changes nothing and contacts no device. ## How a BIG-IP configuration is shaped BIG-IP stores its configuration as tmsh objects, and they all follow one shape: [] { { } } The leading words place the object in BIG-IP's module and component hierarchy (`ltm virtual`, `ltm pool`, `net vlan`, and so on), the name identifies it, and the braces hold its fields. Inside a body, newlines separate entries, brace blocks can nest to any depth, quoted strings may contain spaces, and a `#` begins a comment. The tool follows exactly this grammar to break a snippet into its objects and each object into its fields. ## What it explains Rather than leaving you to recognize each field, the tool describes what the common objects and settings mean: a virtual server's `destination`, `pool`, `profiles`, and `source-address-translation`; a pool's `members`, `monitor`, and `load-balancing-mode`; and the many other objects a configuration ties together. The result is a readable map of what a configuration actually does, which is useful when you inherit a device, review a change, or learn the object model. ## The one thing that is not tmsh There is a deliberate exception. An `ltm rule` object carries a Tcl iRule in its body, and that body is a script, not tmsh configuration. The parser recognizes this and captures the iRule verbatim rather than trying to parse it as objects and fields, so your rule is preserved exactly as written instead of being mangled. ## Using it Paste a `bigip.conf` snippet, from a single object to a large block, and read the structured, explained breakdown. The parse is deterministic and local, so it is also a safe way to read a configuration exported from a device you cannot or should not query directly. ## Standards and references - [F5 BIG-IP tmsh Reference Guide](https://clouddocs.f5.com/cli/tmsh-reference/latest/) - the tmsh object model, module/component hierarchy, and per-object fields - [F5 tmsh Reference: ltm virtual](https://clouddocs.f5.com/cli/tmsh-reference/v16/modules/ltm/ltm_virtual.html) - virtual server fields (destination, pool, profiles, source-address-translation, and more) - [F5 tmsh Reference: ltm pool](https://clouddocs.f5.com/cli/tmsh-reference/v14/modules/ltm/ltm_pool.html) - pool fields (members, monitor, load-balancing-mode, and more) ## Related reading - [BIG-IP Load-Balancing Methods, and What Each One Weighs](https://ronutz.com/en/learn/ltm-load-balancing-methods.md): A pool's load-balancing-mode decides who gets the next connection, and BIG-IP documents 19 of them. They differ along two axes: whether they react to live server state at all, and what exactly they weigh when they do, connections, sessions, response speed, or monitor-fed measurements. - [BIG-IP Pools and Load-Balancing Methods](https://ronutz.com/en/learn/bigip-pools-and-load-balancing.md): A pool is the group of backend members a virtual server sends traffic to, and the load-balancing method decides which member gets each connection. The methods split into static ones that follow a fixed pattern and dynamic ones that react to live load, and the choice shapes how evenly and how smartly traffic spreads. - [BIG-IP Virtual Server Types, and What Each One Actually Does](https://ronutz.com/en/learn/ltm-virtual-server-types.md): A BIG-IP drops traffic by default; a virtual server is the listener that accepts it, and its type decides the processing model, from a full proxy that terminates and re-originates connections to a packet-by-packet forwarder that behaves like a router. Choosing the type is choosing how much the box is allowed to understand. - [How a BIG-IP Virtual Server Works](https://ronutz.com/en/learn/how-a-virtual-server-works.md): A virtual server is the front door of a BIG-IP. It binds a listening IP and port, applies a stack of profiles, decides persistence, picks a pool member, and translates the source address toward the backend. Reading those pieces in order tells you exactly how a connection will be handled. - [How LTM Health Monitors Decide Up or Down](https://ronutz.com/en/learn/ltm-health-monitors.md): A health monitor is the probe a BIG-IP uses to decide whether a backend member can receive traffic. Its send and receive strings, its interval and timeout, and where it is attached together determine how quickly a failure is noticed and how a member is marked down. - [Profiles on a Virtual Server](https://ronutz.com/en/learn/bigip-profiles-on-a-virtual-server.md): A BIG-IP virtual server does not have a fixed behavior; it is assembled from profiles, each one configuring a layer of the connection. Protocol, application, SSL, and persistence profiles stack together to define how traffic is handled, and they inherit settings from parent profiles, which is the key to how BIG-IP config stays manageable. - [SNAT and the Return-Traffic Problem](https://ronutz.com/en/learn/bigip-snat-and-return-traffic.md): For a load-balanced connection to work, the pool member's reply must come back through BIG-IP. If the member routes its return traffic straight to the client instead, the connection breaks. SNAT solves this by making BIG-IP the source address the member replies to, at the cost of hiding the real client IP. - [The Anatomy of a bigip.conf File](https://ronutz.com/en/learn/anatomy-of-bigip-conf.md): Every object in a BIG-IP configuration follows the same shape: a module, a component, an optional type, a name, and a brace-delimited body. Once you can see that pattern, a wall of tmsh config becomes a readable tree of virtual servers, pools, monitors, and profiles.