From a system perspective, a configuration leaf node is different from a simple configuration nonleaf node. A configuration leaf node takes the form node value , as in the following example.

protocol-version v2

A nonleaf node always has an enclosing pair of braces ({}), which may be empty, as in the following example.

loopback lo {
}

or nonempty, as in the following example.

ssh {
	port 22
	protocol-version v2
}