JUNOS Internet Software Network Operations Guide: Hardware
644 ! CLI Configuration Mode
Configuration Statement Hierarchy
The JUNOS software configuration consists of a hierarchy of statements. There are
two types of statements: container statements, which are statements that contain
other statements, and leaf statements, which do not contain other statements (see
Figure 235). All of the container and leaf statements together form the configuration
hierarchy.
Figure 235: Configuration Mode Hierarchy of Statements
Each statement at the top level of the configuration hierarchy resides at the trunk
(or root level) of a hierarchy tree. The top-level statements are container statements,
containing other statements that form the tree branches. The leaf statements are
the leaves of the hierarchy tree. An individual hierarchy of statements, which starts
at the trunk of the hierarchy tree, is called a statement path. Figure 235 illustrates
the hierarchy tree, showing a statement path for the portion of the protocol
configuration hierarchy that configures the hello interval on an interface in an OSPF
area.
The
protocols statement is a top-level statement at the trunk of the configuration
tree. The
ospf, area, and interface statements are all subordinate container
statements of a higher statement (they are branches of the hierarchy tree), and the
hello-interval statement is a leaf on the tree, which, in this case, contains a data
value: the length of the hello interval in seconds.
1412
Trunk of hierarchy tree
(Top-level statements)
Branches of hierarchy tree
(Container statements)
Tree leaves
(Leaf statements)
Protocols
bgp
dvmrp
icmp
igmp
isis
mpis
ospf
rip
router-discovery
rsvp
sap
dead-interval
hello-interval
interface-type
metric
mtu
poll-interval
priority
retransmit-interval
transit-delay
transmit-interval
area-range
interface
stub
virtual-link
area
traceoptions
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