Juniper JUNOSe 11.1, Руководство по настройке

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Use to disable the auto-upgrade feature of the system’s timing selector.
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The system starts out by setting the operational timing selector to the
administratively configured selector. See the
timing select command.
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Example
host1(config)# timing disable-auto-upgrade
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Use the no version to restore the factory default, which is auto-upgrade enabled.
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See timing disable-auto-upgrade.
timing select
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Use to specify which of the configured timing sources is used by default.
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Primary timing source is preferred over secondary, and secondary is preferred
over tertiary. See the
timing source command.
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If you enable the auto-upgrade feature, the system does not try to upgrade beyond
the administratively configured selector.
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Example
host1(config)# timing select secondary
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There is no no version.
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See timing select.
timing source
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Use to specify how the SRP module exchanges timing signals with an interface.
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You can specify primary, secondary, and tertiary timing sources.
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You can specify one external source received on an I/O module or IOA other
than the SRP I/O module or SRP IOA.
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You can specify two or more internal sources or external sources received through
the SRP I/O module or SRP IOA external timing ports.
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On the E120 and E320 routers, you can specify sonet for only two of the available
three timing sources (primary, secondary, or tertiary).
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The available sources to choose are:
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ds1—DS1 interface
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ds3—DS3 interface
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e1—E1 interface
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e3—E3 interface
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sonet—SONET interface
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internal—Internal system controller (SC) oscillator
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line—External timing input on SRP module
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Configuring Timing
JUNOSe 11.1.x System Basics Configuration Guide