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Transactional Configuration
Basic Operation
In order to edit the candidate configuration the operator must first enter the candidate edit mode
(edit-cfg). The operator can enter and quit the configuration mode as many times as they wish
before finally committing the candidate.
In edit-cfg mode the operator builds a set candidate configuration changes using the same CLI tree
as standard (line-by-line non-transactional) configuration. Tab completion and keyword syntax
checking is available.
Just as there is a single operational active configuration that can be modified simultaneously by
multiple users in SR OS, there is also a single global candidate configuration instance. All users
make changes in the same global candidate configuration and a commit operation by any user will
commit the changes made by all users.
Users have the ability to exclusively create a candidate configuration by blocking other users (and
sessions of the same user) from entering edit-cfg mode.
If a commit operation is successful then all of the candidate changes will take operational effect
and the candidate is cleared. If there is an error in the processing of the commit, or a 'commit
confirmed' is not confirmed and an auto-revert occurs, then the router will return to a
configuration state with none of the candidate changes applied. The operator can then continue
editing the candidate and try a commit later.
All commands in the candidate configuration must be in the correct order for a commit to be
successful. Configuration that depends on other candidate objects must be placed after those
objects in the candidate. A set of candidate editing commands (copy, insert, etc) are available to
correct and reorder the candidate configuration.
The edit-cfg mode is primarily intended for building a candidate configuration while navigating
the configure branch of CLI. Many CLI commands in branches other than configure are
supported while in edit-cfg mode, but access to some CLI branches and command are blocked
including the:
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The candidate configuration can be saved to a file and subsequently loaded into a candidate
configuration. A saved candidate is similar to, but not the same as an SR OS config file generated
with an admin save command. The saved candidate cannot be used in general as a configuration
file and may not exec without failures.
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exec command
enable-admin command
enable-dynamic-services-config command
admin branch
bof branch
debug branch
tools branch
7950 SR OS Basic System Configuration Guide
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