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synchronization (MX Series)

Syntax

Hierarchy Level

Release Information

Statement introduced in Junos OS Release 10.4.

Description

(MX5, MX10, MX40, MX80, MX80-T, MX240, MX480, and MX960 routers) Configure Synchronous Ethernet parameters.

Note: Unified ISSU is not supported when clock synchronization is configured for Synchronous Ethernet.

Options

clock-mode (auto-select | free-run)—Specify the mode of operation to select the clock source either from a free-run local oscillator or from an external qualified clock. On MX80 routers, the free-run clock is provided by the SCB. On MX240, MX480 and MX960routers with enhanced MPCs, the free-run clock is provided by a local oscillator. The default setting is auto-select mode.

esmc-transmit interfaces (all | interface-name)—Enable Ethernet Synchronization Message Channel (ESMC) packet transmission.

• Time interval to wait before selecting the new clock source during.
• The default switchover is 30 seconds. Cold reboot is 120 seconds.

network-option (option-1 | option-2)—Specify the synchronization networking: EEC-1 maps to G.813 option 1 or EEC-2 maps to G.812 type IV clock.

quality-mode-enable—Specify the clock selection, quality level, and priority setting. The default setting is disable.

• When the selection-mode statement is set as configured-quality, the clock source selection algorithm uses the ESMC or SSM quality level configured for a qualifying interface.
• When the selection-mode statement is set as received-quality, the clock source selection algorithm uses the ESMC or SSM quality level received on the qualifying interface.

Note: For the selection-mode statement configuration to take effect, you must set the quality-mode-enable statement at the [edit chassis synchronization] hierarchy level.

• In revertive mode, the system switches from a lower to a higher quality clock source whenever the higher clock source becomes available.
• In non-revertive mode, the system continues to use the current clock source as long as it is valid.
• The default is revertive mode.

• priority number—(Optional) A priority level between 1 and 5. When not specified, external-a has higher default priority than external-b, and external-b has higher default priority than other Gigabit Ethernet or 10-Gigabit Ethernet clock sources, which have the lowest default priority. Configured priority is higher than any default priority.

• quality-level (prc | prs |sec | smc | ssu-a | ssu-b | st2 | st3 | st3e | st4 | stu | tnc)—Specify the clock type. Specific quality-level options are valid depending on the configured network-option, option-1 or option-2.

  • Both option I and option II SSM quality levels (QL) are supported:

    • For option-1, QL must be configured for external clocks (extern-a or extern-b) whether or not QL is enabled 3.
    • For option-2, the default QL for external clocks is QL_STU whether or not QL is enabled.
  • QL is set to DNU for network-option 1 and set to DUS for network-option 2, if quality-level not configured and no ESMC messages received.
  • On selected active source (primary or secondary which is active), even if ESMC transmit is not enabled, a DNU ESMC will be sent out if network-option is 1, and DUS ESMC will be sent out if network-option is 2. This is applicable only for sources of type ethernet interface. This is done to avoid the source looping as per the standard requirement.
• request force-switch—Forces a switch to the source provided the source is enabled and not locked out. Only one configured source may be force-switched.
• request lockout—Lockout may be configured for any source. When configured, that source will not be considered by the selection process.
• wait-to-restore minutes—You can specify a time for each port. When a port’s signal transitions out of the signal fail state, it must be fault free for the wait-to-restore time before it is again considered by the selection process.

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.