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show chassis synchronization (MX Series Routers)

 

Syntax

Release Information

Command introduced in Junos OS Release 10.4.

Command introduced in Junos OS Release 13.3 for MX2020 routers.

clock-module option introduced in Junos OS Release 12.2.

Command introduced in Junos OS Release 17.3R1 for MX10003 Universal Routing Platforms.

Command introduced in Junos OS Release 17.4 for MX204 Universal Routing Platforms.

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:
re0Routing Engine 0
re1Routing 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

List of Sample Output

show chassis synchronization

show chassis synchronization extensive

show chassis synchronization extensive (Synchronous Ethernet with link down)

show chassis synchronization extensive (Synchronous Ethernet with physical interface not restored)

show chassis synchronization extensive (Synchronous Ethernet configured on ineligible slot 10)

show chassis synchronization extensive (on MX104 Router)

show chassis synchronization clock-module (MX10003 Router)

show chassis synchronization clock-module (MX204 Router)

show chassis synchronization interface

show chassis synchronization clock-module

show chassis synchronization (configured external clock interface)

show chassis synchronization clock-module (configured external clock interface)

show chassis synchronization extensive (configured external clock interface)

show chassis synchronization clock-module(configured external clock interfaces)

show chassis synchronization extensive (configured external clock interface)

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

show chassis synchronization

user@host> show chassis synchronization

Sample Output

show chassis synchronization extensive

user@host> show chassis synchronization extensive

Sample Output

show chassis synchronization extensive (Synchronous Ethernet with link down)

user@host> show chassis synchronization extensive

Sample Output

show chassis synchronization extensive (Synchronous Ethernet with physical interface not restored)

user@host> show chassis synchronization extensive

Sample Output

show chassis synchronization extensive (Synchronous Ethernet configured on ineligible slot 10)

user@host> show chassis synchronization extensive

Sample Output

show chassis synchronization extensive (on MX104 Router)

user@host> show chassis synchronization extensive

Sample Output

show chassis synchronization clock-module (MX10003 Router)

user@host> show chassis synchronization extensive

Sample Output

show chassis synchronization clock-module (MX204 Router)

user@host> show chassis synchronization clock-module

Sample Output

show chassis synchronization interface

user@host> show chassis synchronization interface ge-1/0/2

Sample Output

show chassis synchronization clock-module

user@host> show chassis synchronization clock-module

show chassis synchronization (configured external clock interface)

user@host> show chassis synchronization

show chassis synchronization clock-module (configured external clock interface)

user@host> show chassis synchronization clock-module

show chassis synchronization extensive (configured external clock interface)

user@host> show chassis synchronization extensive

show chassis synchronization clock-module(configured external clock interfaces)

user@host> show chassis synchronization clock-module

show chassis synchronization extensive (configured external clock interface)

user@host> show chassis synchronization extensive