Understanding the YANG Modules for Junos Operational Commands
Juniper Networks publishes YANG modules that define the remote procedure calls (RPCs) for
Junos operational mode commands. Due to the large number of operational commands, there are
multiple YANG modules for each device family. There is a module for each top-level operational
command group (clear, file, monitor, and so
on) where there is at least one command within that hierarchy with an RPC equivalent. There is
also a separate module for each area within the show command hierarchy.
Starting in Junos OS Release 17.2, Junos YANG modules are specific to a device family and
use a new convention for the module namespace. In addition, each of the individual
operational command modules defines its namespace prefix using the command hierarchy area of
the RPCs included in that module. Prior to Junos OS Release 17.2, the prefix for all
operational command modules was jrpc.
Starting in Junos OS Release 17.4R1, Junos OS YANG modules use a new naming convention for the module’s name, filename, and namespace. For more information, see Understanding Junos YANG Modules.
The operational command modules define the RPCs corresponding to the operational commands in
the command hierarchy area indicated in the filename. The following example shows a portion of
the module containing the RPCs for commands in the clear command hierarchy:
user@host> file show /var/tmp/yang/junos-rpc-clear@2017-01-01.yang
/*
* Copyright (c) 2017 Juniper Networks, Inc.
* All rights reserved.
*/
module junos-rpc-clear {
namespace "http://yang.juniper.net/junos/rpc/clear";
prefix clear;
import junos-common-types {
prefix jt;
}
organization "Juniper Networks, Inc.";
contact "yang-support@juniper.net";
description "Junos RPC YANG module for clear command(s)";
revision 2017-01-01 {
description "Junos: 17.4R1.17";
}
rpc clear-cli-logical-system {
description "Clear logical system association";
output {
leaf output {
type string;
}
}
}
rpc clear-cli-satellite {
description "Clear satellite association";
output {
leaf output {
type string;
}
}
}
...
YANG defines operations using the rpc statement. The RPC definition can
include input and output substatements that describe the
operation's input and output parameters. Starting in Junos OS Release 23.1R1, the RPC's
output statement includes an accurate output schema, and Junos devices emit
the new schemas by default.
In earlier releases, the RPC's output schema includes the anyxml statement
to represent an unkown chunk of XML in the RPC reply. To generate the RPC schemas containing
the anyxml statement on a Junos device, configure the
device-specific and emit-anyxml-in-rpc-output statements
at the [edit system services netconf yang-modules] hierarchy level. After you
configure the statements, the show system schema command generates the
schemas that use anyxml.
You can download the Junos YANG modules from the Juniper Networks download site or the
Juniper Networks GitHub repository for YANG, or you can generate the modules on the local
device. To generate the operational command YANG modules on the local device issue the
show system schema format yang module module command.
The Junos OS release determines the available command options.
-
In Junos OS Release 17.3 and earlier, specify the
juniper-commandmodule to generate all of the operational command modules.user@host> show system schema format yang module juniper-command
Note:Starting in Junos OS Release 17.1, when you generate the
juniper-commandmodule, the output files are placed in the current working directory, which defaults to the user’s home directory. In Junos OS Release 16.2 and earlier, the output files are placed in the /var/tmp directory. -
In Junos OS Release 17.4R1 and later, specify an individual module name to return a single operational command module, or specify
all-rpcto return all operational command modules.user@host> show system schema format yang module all-rpc output-directory /var/tmp/yang
Starting in Junos OS Release 19.1R2 and 19.2R1, the
show system schemacommand must include theoutput-directorycommand option and specify the directory in which to generate the file or files. In earlier releases, you can omit theoutput-directoryoption when requesting a single module to display the module in standard output.
To generate the modules from a remote session, execute the
<get-yang-schema> Junos OS RPC or the
<get-schema> NETCONF operation with the appropriate options.
If you specify module juniper-command or module all-rpc,
the output files include both native Junos operational command modules as well as any standard
or custom operational command modules that have been added to the device. To use an RPC in
your custom YANG module, you must import the module that contains the desired RPC into your
custom module.
You can configure the emit-extensions statement at the [edit system
services netconf yang-modules] hierarchy level to emit the YANG schemas with
additional Junos extension statements. The Junos extensions are defined in Understanding the Junos DDL Extensions YANG Module. The device emits the
junos:command extension statement starting in Junos OS Release 22.4R1 and
Junos OS Evolved Release 22.4R1.
Starting in Junos OS Release 17.4R1, the native YANG modules generated on a local device
contain family-specific schemas, which are identical across all devices in the given device
family. In earlier releases, the generated modules contain device-specific schemas. To
generate device-specific modules in Junos OS Release 17.4R1 and later, configure the
device-specific configuration statement at the [edit system
services netconf yang-modules] hierarchy level.
junos:command extension
statement in schemas emitted with extensions.show system
schema command must include the output-directory command
option and specify the directory in which to generate the file or files.juniper-command module, the output files are placed in the current
working directory, which defaults to the user’s home directory