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show chassis synchronization (MX Series Routers)

date_range 06-Dec-24

Syntax

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show chassis synchronization
<clock-module <(re0 | re1 | routing-engine (backup | both | local | master | other))>>
<extensive>
<interface interface-name>

Description

Display information about clocks used for chassis synchronization.

Note:

In hybrid mode, the EEC in the MPC derives frequency synchronization from Synchronous Ethernet and the phase and time of day from PTP; however, the show chassis synchronization extensive operational mode command output displays the lock status that is derived from the EEC located on the SCB.

Note:

The Switch Control Board (SCB) framer in MX Series routers supports only the first-generation Synchronization Status Message (SSM) format. Therefore, whenever the router needs to transmit an SSM value of st3e or tnc via an external interface, an SSM value of st3 is transmitted. However, on a Synchronous Ethernet interface, an ESMC packet with the unadjusted SSM is transmitted. The term unadjusted here means:

If the receive-quality statement at the [edit chassis synchronization selection-mode] hierarchy level is configured, the originally received SSM value st3e or tnc (corresponding to the currently active Synchronous Ethernet clock interface) is transmitted.
If the configured quality statement at the [edit chassis synchronization selection-mode] hierarchy level is configured, the originally configured SSM value of st3e or tnc (corresponding to the currently active Synchronous Ethernet clock interface) is transmitted.

Note that when the external interface receives an SSM value of either st3e or tnc, the SCB framer does not recognize either of these SSM codes, and therefore, it reports that the Do Not Use (DNU) quality value has been received.

SCBE2 does not support SSM when you configure the following framing format values on the external interface at the [edit chassis synchronization interfaces external] hierarchy level:

sf for the t1-options statement
g704-no-crc for the e1-options statement

Options

clock-module

(MX240, MX480, MX960, MX10003, MX204, MX2010, MX2020, and MX2008 routers with Enhanced MX Switch Control Board; ) (Optional) Display clock module information. You can optionally specify one of these Routing Engine qualifiers:

re0	Routing Engine 0
re1	Routing Engine 1
routing-engine (backup \| both \| local \| master \| other)	Routing Engine type

extensive

(Optional) Display clock synchronization information in detail.

interface interface-name

(Optional) Display clock synchronization information for the specified interface.

Required Privilege Level

maintenance

Output Fields

Table 1 lists the output fields for the show chassis synchronization command. Output fields are listed in the approximate order in which they appear.

Table 1: show chassis synchronization Output Fields
Field Name	Field Description	Level of Output
`Current clock status`	Indicates the current status of chassis synchronization: `Locked`—Clock is operational. `Holdover`—Clock is not operational. `Freerun`—Clock is locked to the free-run local oscillator.	none
`Clock locked to`	Indicates whether the clock is locked to either the `primary` source or the `secondary` source.	none
`Configured sources`	Heading for the list of interfaces configured for chassis synchronization and their subsequent status indicators.	none
`Source name`	Indicates the configured interface that is the source. The `external` source name indicates the external clock interface.	none
`Configured Priority`	Indicates the priority configured for the interface.	none
`Interface Status`	Indicates the status of the interface as `primary`, `secondary`, or `n/a` (external).	none
`Configured quality`	Indicates the configured quality of the interface. `prs` —Primary reference source—Stratum 1 `st2`—Stratum 2 `tnc`—Transit node clock `st3e`—Stratum 3E `st3`—Stratum 3 `smc`—SONET minimum clock `st4`—Stratum 4 `prc`—Primary reference clock `ssu-a`—Synchronization supply unit A `ssu-b`—Synchronization supply unit B `sec`—SDH equipment clock	none
`Interface`	Indicates the configured interface: `ge-fpc/pic/port`—Indicates the interface type and which FPC, PIC, and port are configured.	`extensive`
`Status`	Indicates the synchronization status of the indicated interface, as follows: `Primary`—This interface is the selected primary chassis clock source. `Secondary`—This interface is the selected secondary chassis clock source. `n/a`—This interface is not a selected clock source.	`extensive`
`Index`	Unique numeric identifier for the established Synchronous Ethernet configuration.	`extensive`
`Clock source state`	Indicates the status of the Synchronous Ethernet clock source: `Clk qualified`—The Synchronous Ethernet clock source is qualified. `n/a`—The Synchronous Ethernet clock source is not qualified.	`extensive`
`Priority`	Indicates the configured priority. The range is from 1 through 5. The following values indicate whether the parameter is not specified or undefined: `Default(8)`—The parameter is not specified. `-` —The parameter is undefined or out of range.	`extensive`
`Configured QL`	Indicates the configured source interface quality level (QL), which is dependent on the source interface and option. The following quality levels are supported and the configured QL is indicated: `prc \| ssu-a \| ssu-b \| sec`—Network option-1 QLs `prs \| st2 \| tnc \| st3e \| st3 \| smc \| st4`—Network option-2 QLs	`extensive`
`ESMC QL`	Indicates the configured Ethernet Synchronization Message Channel (ESMC) quality level: `DNU`—Network option-1 source `DSU`—Network option-2 source	`extensive`
`Clock source type`	Indicates that the configured chassis synchronization clock source is one of the following types: `ifd`—Uses the free-run local oscillator. `extern`—Uses a configured qualified clock source.	`extensive`
`Clock Event`	Indicates the event clock status: `Clock locked`—Clock is established. `n/a`—Clock is not established.	`extensive`
Configuration flags	Indicates `Ext` for external interface configuration
`Wait-to-restore time`	Indicates the amount of time in minutes for the port signal to be up before the port is opened to receive and transmit Ethernet Synchronization messages.	`extensive`
`Hold-off time`	Indicates the amount of time in milliseconds for hold off time for Synchronous Ethernet interfaces and external clock source interfaces to prevent rapid successive switching. If an interface goes down, hold-off time delays short signal failures from being sent to the clock selection process.	`extensive`
`Kernel flags`	Indicates the Synchronous Ethernet software operational status: `Up`—The Synchronous Ethernet software is operational for the configured interface. `pri`—The source is the selected primary clock source. `Dn`—The Synchronous Ethernet software is not operational for the configured interface.	`extensive`
`Ineligibility reason`	Indicates the reason the interface is ineligible for the Synchronous Ethernet operation, including the following: `Link Down`—The link between the Synchronous Ethernet interfaces is not operational. `Not restored`—The Synchronous Ethernet link has not yet been restored because it is waiting for the specified `wait-to-restore` time to elapse. `Forbidden slot`—Slot 10 is not supported. `Interface unit missing`—The unit parameter is not set or is invalid. `Locked`—The paired interface is not available. `No cfg`—Synchronous Ethernet is not configured. `RX Disabled`—The receiving interface is disabled. `Undefined/invalid QL`—The QL mode is not specified in the configuration or, if specified, is not supported. Note: When GPS is configured as the clock source and the `quality-mode-enable` statement is configured, the `Current Lock Status` is displayed as `Locked` but `Undefined/invalid QL` is displayed as the Ineligibility reason. As a workaround, configure the `no-ssm-support` statement at the `[edit chassis synchronization source interfaces interface-name]` hierarchy level. `System initialization in progress`—The remote system is performing initialization and not currently available for synchronization. `Unsupported interface`—The configured interface does not support Synchronous Ethernet.	`extensive`
`Clock module on`	Indicates whether the clock module is on the Switch Control Board `SCB0` or `SCB1`.	`clock-module`
`Current role`	Indicates the role of the clock module: `master`—The clock module is on the primary SCB, which is the active chassis clock source. `backup`—The clock module is on the backup SCB, which mirrors the state of the active clock.	`clock-module`
`Current state`	Indicates the state of the clock module: `freerun`—The clock module is in free-run mode. When the system starts up, the default clock module state is free-run. `acquiring-lock on`—The clock module is attempting to acquire a lock on the specified clock source. `locked to`—The clock module is locked to the specified clock source. `holdover on`—The clock module is in holdover mode on the specified clock source. Prior to the specified clock source becoming invalid, the clock module was locked on the source and holdover data was collected. `holdover`—The clock module has transitioned into holdover prior to locking on a valid clock source and collecting holdover data.	`clock-module`
`Monitored clock sources`	Displays information about monitored clock sources.	`clock-module`
`Interface`	Indicates the interface type and which FPC, PIC, and port are configured: `external`—External clock source `ge-fpc/pic/port`—Line Synchronous Ethernet or PTP client `xe-fpc/pic/port`—Line Synchronous Ethernet or PTP client	`clock-module`
`Type`	Indicates the type of clock source: `t1`—BITS T1 framed `e1`—BITS E1 framed `2048khz`—BITS unframed 2048 KHz frequency source `syncE`—Synchronous Ethernet frequency source `ptp`—PTP client source `ptp-hybrid`—PTP client source using Synchronous Ethernet for frequency	`clock-module`
`Status`	Indicates the status of the clock source: `failed`—The clock source is in the failed state. `qualifying`—The clock source is being qualified. `qualified`—The clock source is qualified and can be selected as the chassis clock source. `qualified-selected`—The clock source is qualified and selected as the chassis clock source.	`clock-module`

Sample Output