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245 lines
10 KiB
ReStructuredText
245 lines
10 KiB
ReStructuredText
Table of Contents
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-----------------
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- `Introduction <#introduction>`__
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- `Configuration modes <#config-modes>`__
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- `New commands <#retrofitting-process>`__
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- `commit check <#cmd1>`__
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- `commit <#cmd2>`__
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- `discard <#cmd3>`__
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- `configuration database max-transactions <#cmd4>`__
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- `configuration load <#cmd5>`__
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- `rollback configuration <#cmd6>`__
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- `show configuration candidate <#cmd7>`__
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- `show configuration compare <#cmd8>`__
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- `show configuration running <#cmd9>`__
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- `show configuration transaction <#cmd10>`__
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- `show yang module <#cmd11>`__
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- `show yang module-translator <#cmd12>`__
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- `update <#cmd13>`__
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- `yang module-translator load <#cmd14>`__
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- `yang module-translator unload <#cmd15>`__
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Introduction
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~~~~~~~~~~~~
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All FRR daemons have built-in support for the CLI, which can be accessed
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either through local telnet or via the vty socket (e.g. by using
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*vtysh*). This will not change with the introduction of the Northbound
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API. However, a new command-line option will be available for all FRR
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daemons: ``--tcli``. When given, this option makes the daemon start with
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a transactional CLI and configuration commands behave a bit different.
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Instead of editing the running configuration, they will edit the
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candidate configuration. In other words, the configuration commands
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won’t be applied immediately, that has to be done on a separate step
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using the new ``commit`` command.
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The transactional CLI simply leverages the new capabilities provided by
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the Northbound API and exposes the concept of candidate configurations
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to CLI users too. When the transactional mode is not used, the
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configuration commands also edit the candidate configuration, but
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there’s an implicit ``commit`` after each command.
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In order for the transactional CLI to work, all configuration commands
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need to be converted to the new northbound model. Commands not converted
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to the new northbound model will change the running configuration
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directly since they bypass the FRR northbound layer. For this reason,
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starting a daemon with the transactional CLI is not advisable unless all
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of its commands have already been converted. When that’s not the case,
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we can run into a situation like this:
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::
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ospfd(config)# router ospf
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ospfd(config-router)# ospf router-id 1.1.1.1
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[segfault in ospfd]
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The segfault above can happen if ``router ospf`` edits the candidate
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configuration but ``ospf router-id 1.1.1.1`` edits the running
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configuration. The second command tries to set
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``ospf->router_id_static`` but, since the previous ``router ospf``
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command hasn’t been commited yet, the ``ospf`` global variable is set to
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NULL, which leads to the crash. Besides this problem, having a set of
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commands that edit the candidate configuration and others that edit the
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running configuration is confusing at best. The ``--tcli`` option should
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be used only by developers until the northbound retrofitting process is
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complete.
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Configuration modes
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~~~~~~~~~~~~~~~~~~~
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When using the transactional CLI (``--tcli``), FRR supports three
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different forms of the ``configure`` command: \* ``configure terminal``:
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in this mode, a single candidate configuration is shared by all users.
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This means that one user might delete a configuration object that’s
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being edited by another user, in which case the CLI will detect and
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report the problem. If one user issues the ``commit`` command, all
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changes done by all users are committed. \* ``configure private``: users
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have a private candidate configuration that is edited separately from
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the other users. The ``commit`` command commits only the changes done by
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the user. \* ``configure exclusive``: similar to ``configure private``,
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but also locks the running configuration to prevent other users from
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changing it. The configuration lock is released when the user exits the
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configuration mode.
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When using ``configure terminal`` or ``configure private``, the
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candidate configuration being edited might become outdated if another
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user commits a different candidate configuration on another session.
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TODO: show image to illustrate the problem.
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New commands
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~~~~~~~~~~~~
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The list below contains the new CLI commands introduced by Northbound
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API. The commands are available when a daemon is started using the
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transactional CLI (``--tcli``). Currently ``vtysh`` doesn’t support any
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of these new commands.
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Please refer to the [[Demos]] page to see a demo of the transactional
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CLI in action.
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--------------
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``commit check``
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''''''''''''''''
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Check if the candidate configuration is valid or not.
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``commit [force] [comment LINE...]``
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''''''''''''''''''''''''''''''''''''
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Commit the changes done in the candidate configuration into the running
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configuration.
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Options: \* ``force``: commit even if the candidate configuration is
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outdated. It’s usually a better option to use the ``update`` command
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instead. \* ``comment LINE...``: assign a comment to the configuration
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transaction. This comment is displayed when viewing the recorded
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transactions in the output of the ``show configuration transaction``
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command.
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``discard``
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'''''''''''
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Discard the changes done in the candidate configuration.
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``configuration database max-transactions (1-100)``
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'''''''''''''''''''''''''''''''''''''''''''''''''''
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Set the maximum number of transactions to store in the rollback log.
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``configuration load <file [<json|xml> [translate WORD]] FILENAME|transaction (1-4294967296)> [replace]``
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Load a new configuration into the candidate configuration. When loading
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the configuration from a file, it’s assumed that the configuration will
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be in the form of CLI commands by default. The ``json`` and ``xml``
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options can be used to load configurations in the JSON and XML formats,
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respectively. It’s also possible to load a configuration from a previous
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transaction by specifying the desired transaction ID
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(``(1-4294967296)``).
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Options: \* ``translate WORD``: translate the JSON/XML configuration
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file using the YANG module translator. \* ``replace``: replace the
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candidate by the loaded configuration. The default is to merge the
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loaded configuration into the candidate configuration.
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``rollback configuration (1-4294967296)``
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'''''''''''''''''''''''''''''''''''''''''
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Roll back the running configuration to a previous configuration
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identified by its transaction ID (``(1-4294967296)``).
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``show configuration candidate [<json|xml> [translate WORD]] [<with-defaults|changes>]``
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Show the candidate configuration.
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Options: \* ``json``: show the configuration in the JSON format. \*
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``xml``: show the configuration in the XML format. \*
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``translate WORD``: translate the JSON/XML output using the YANG module
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translator. \* ``with-defaults``: show default values that are hidden by
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default. \* ``changes``: show only the changes done in the candidate
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configuration.
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``show configuration compare <candidate|running|transaction (1-4294967296)> <candidate|running|transaction (1-4294967296)> [<json|xml> [translate WORD]]``
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Show the difference between two different configurations.
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Options: \* ``json``: show the configuration differences in the JSON
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format. \* ``xml``: show the configuration differences in the XML
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format. \* ``translate WORD``: translate the JSON/XML output using the
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YANG module translator.
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``show configuration running [<json|xml> [translate WORD]] [with-defaults]``
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Show the running configuration.
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Options: \* ``json``: show the configuration in the JSON format. \*
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``xml``: show the configuration in the XML format. \*
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``translate WORD``: translate the JSON/XML output using the YANG module
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translator. \* ``with-defaults``: show default values that are hidden by
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default.
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NOTE: ``show configuration running`` shows only the running
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configuration as known by the northbound layer. Configuration
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commands not converted to the new northbound model will not be
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displayed. To show the full running configuration, the legacy
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``show running-config`` command must be used.
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``show configuration transaction [(1-4294967296) [<json|xml> [translate WORD]] [changes]]``
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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When a transaction ID (``(1-4294967296)``) is given, show the
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configuration associated to the previously committed transaction.
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When a transaction ID is not given, show all recorded transactions in
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the rollback log.
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Options: \* ``json``: show the configuration in the JSON format. \*
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``xml``: show the configuration in the XML format. \*
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``translate WORD``: translate the JSON/XML output using the YANG module
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translator. \* ``with-defaults``: show default values that are hidden by
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default. \* ``changes``: show changes compared to the previous
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transaction.
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``show yang module [module-translator WORD] [WORD <summary|tree|yang|yin>]``
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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When a YANG module is not given, show all loaded YANG modules.
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Otherwise, show detailed information about the given module.
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Options: \* ``module-translator WORD``: change the context to modules
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loaded by the specified YANG module translator. \* ``summary``: display
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summary information about the module. \* ``tree``: display module in the
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tree (RFC 8340) format. \* ``yang``: display module in the YANG format.
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\* ``yin``: display module in the YIN format.
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``show yang module-translator``
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'''''''''''''''''''''''''''''''
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Show all loaded YANG module translators.
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``update``
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''''''''''
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Rebase the candidate configuration on top of the latest running
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configuration. Conflicts are resolved automatically by giving preference
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to the changes done in the candidate configuration.
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The candidate configuration might be outdated if the running
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configuration was updated after the candidate was created.
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``yang module-translator load FILENAME``
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''''''''''''''''''''''''''''''''''''''''
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Load a YANG module translator from the filesystem.
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``yang module-translator unload WORD``
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''''''''''''''''''''''''''''''''''''''
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Unload a YANG module translator identified by its name.
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