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.
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.
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
Required Privilege Level
maintenance
Related Documentation
List of Sample Output
show chassis synchronizationshow 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:
| 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.
| none |
Interface | Indicates the configured interface:
| extensive |
Status | Indicates the synchronization status of the indicated interface, as follows:
| extensive |
Index | Unique numeric identifier for the established Synchronous Ethernet configuration. | extensive |
Clock source state | Indicates the status of the Synchronous Ethernet clock source:
| 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:
| 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:
| extensive |
ESMC QL | Indicates the configured Ethernet Synchronization Message Channel (ESMC) quality level:
| extensive |
Clock source type | Indicates that the configured chassis synchronization clock source is one of the following types:
| extensive |
Clock Event | Indicates the event clock status:
| 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:
| extensive |
Ineligibility reason | Indicates the reason the interface is ineligible for the Synchronous Ethernet operation, including the following:
| 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:
| clock-module |
Current state | Indicates the state of the clock module:
| 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:
| clock-module |
Type | Indicates the type of clock source:
| clock-module |
Status | Indicates the status of the clock source:
| clock-module |
Sample Output
show chassis synchronization
user@host> show chassis synchronizationCurrent clock status: Locked Clock locked to : Primary Configured sources Source Configured Interface Configured Name Priority Status Quality ge-1/0/0 - Primary PRC
Sample Output
show chassis synchronization extensive
user@host> show chassis synchronization extensiveCurrent clock status: Locked Clock locked to : Primary Configured sources: Interface : ge-1/0/0 Status : Primary Index : 143 Clock source state : Clk qualified Priority : - Configured QL : PRC ESMC QL : DNU Clock source type : ifd Clock Event : Clock locked Kernel flags : Up,pri, Wait-to-restore time : 1 Hold-off time : 1200 Interface State : Up,ESMC TX(QL SEC/SSM 0xb),
Sample Output
show chassis synchronization extensive (Synchronous Ethernet with link down)
user@host> show chassis synchronization extensiveCurrent clock status : Holdover Configured sources: Interface : ge-1/0/2 Status : n/a Index : 142 Clock source state : n/a Priority : Default(8) Configured QL : SSU-B ESMC QL : DNU Clock source type : ifd Clock Event : n/a Kernel flags : Dn, Ineligibility reason: Link Down, Wait-to-restore time : 1 Hold-off time : 1200 Interface State : Up,ESMC TX(QL SEC/SSM 0xb),
Sample Output
show chassis synchronization extensive (Synchronous Ethernet with physical interface not restored)
user@host> show chassis synchronization extensiveCurrent clock status : Holdover Configured sources: Interface : ge-1/0/2 Status : n/a Index : 142 Clock source state : n/a Priority : Default(8) Configured QL : SSU-B ESMC QL : DNU Clock source type : ifd Clock Event : n/a Kernel flags : Restoring in 13s,ESMC TX(QL DNU/SSM 0xf), Ineligibility reason: Not restored, Wait-to-restore time : 1 Hold-off time : 1200 Interface State : Up,ESMC TX(QL SEC/SSM 0xb),
Sample Output
show chassis synchronization extensive (Synchronous Ethernet configured on ineligible slot 10)
user@host> show chassis synchronization extensiveCurrent clock status : Holdover Configured sources: Interface : ge-10/0/2 # Note: configuration 10/x/y (slot 10), which does not support Synchronous Ethernet Status : n/a Index : 142 Clock source state : n/a Priority : Default(8) Configured QL : SSU-B ESMC QL : DNU Clock source type : ifd Clock Event : n/a Kernel flags : Up, Ineligibility reason: Forbidden slot, Wait-to-restore time : 1 Hold-off time : 1200 Interface State : Up,ESMC TX(QL SEC/SSM 0xb),
Sample Output
show chassis synchronization extensive (on MX104 Router)
user@host> show chassis synchronization extensiveCurrent clock status : Locked Clock locked to : Primary Configured interfaces: Name : bits Signal type : e1 (g704 hdb3 sa4) Rx status : active Tx status : active Configured sources: Interface : bits Status : Primary Index : 2 Clock source state : Clk qualified Priority : Default(7) Configured QL : SEC ESMC QL : SEC Clock source type : extern Clock Event : Clock locked Wait-to-restore : 5 min Hold-off : 1000 ms Interface State : Up,pri,ESMC Rx(SSM 0xb)
Sample Output
show chassis synchronization clock-module (MX10003 Router)
user@host> show chassis synchronization extensiveCurrent clock status : Locked Clock locked to : Primary SNMP trap status : Disabled Configured sources: Interface : et-0/1/3 Status : Secondary Index : 563 Clock source state : Clk qualified Priority : 1 Configured QL : PRC ESMC QL : DNU Clock source type : ifd Clock Event : Clock qualified Wait-to-restore : 0 min Hold-off : 1000 ms Interface State : Up,sec,ESMC TX(QL PRC/SSM 0x2), Interface : et-0/1/7 Status : n/a Index : 567 Clock source state : n/a Priority : 3 Configured QL : PRC ESMC QL : DNU Clock source type : ifd Clock Event : n/a Wait-to-restore : 0 min Hold-off : 1000 ms Interface State : Up,ESMC TX(QL PRC/SSM 0x2), Interface : et-0/1/8 Status : Primary Index : 568 Clock source state : Clk qualified Priority : 1 Configured QL : PRC ESMC QL : DNU Clock source type : ifd Clock Event : Clock locked Wait-to-restore : 0 min Hold-off : 1000 ms Interface State : Up,pri,ESMC TX(QL DNU/SSM 0xf), Interface : et-1/1/1 Status : n/a Index : 555 Clock source state : n/a Priority : 5 Configured QL : PRC ESMC QL : DNU Clock source type : ifd Clock Event : n/a Wait-to-restore : 0 min Hold-off : 1000 ms Interface State : Dn, Ineligibility reason: Link Down
Sample Output
show chassis synchronization clock-module (MX204 Router)
user@host> show chassis synchronization clock-modulere0: -------------------------------------------------------------------------- Clock module on SCB0 Current role : master
Sample Output
show chassis synchronization interface
user@host> show chassis synchronization interface
ge-1/0/2Current clock status : Locked Clock locked to : Primary
Sample Output
show chassis synchronization clock-module
user@host> show chassis synchronization clock-moduleClock module on SCB0
Current role : master
Current state : locked to ge-4/1/0
State for : 0 days, 00 hrs, 00 mins, 15 secs
State since : Mon Jun 6 07:29:40 2011
Monitored clock sources
Interface Type Status
ge-4/1/0 syncE qualified-selected
ge-4/3/0 syncE qualified
show chassis synchronization (configured external clock interface)
user@host> show chassis synchronization Current clock status : Free-run Configured interfaces: Name Signal type Rx status Tx status external e1 (g704 ami sa4) loss of signal squelched Configured outputs: Interface Tx status Minimum QL Tx QL external squelched SEC DNU Configured sources: Source Configured Interface Configured Name Priority Status Quality external Default(6) n/a SSU-A
show chassis synchronization clock-module (configured external clock interface)
user@host> show chassis synchronization clock-modulere0:
--------------------------------------------------------------------------
Clock module on SCB0
Current role : master
Current state : freerun
State for : 2 days, 06 hrs, 16 mins, 57 secs
State since : Wed Nov 14 08:02:07 2012
Monitored clock sources
Interface Type Status
external e1 failed show chassis synchronization extensive (configured external clock interface)
user@host> show chassis synchronization extensiveCurrent clock status: Locked Clock locked to : Primary Configured sources: Interface : xe-2/0/10 Status : Primary Index : 227 Clock source state : Clk qualified Priority : Default (8) Configured QL : SEC ESMC QL : SEC Clock source type : ifd Clock Event : Clock locked Kernel flags : Up,pri, ESMC Rx(SSM 0xb),ESMC TX(QL DNU/SSM 0xf),
show chassis synchronization clock-module(configured external clock interfaces)
user@host> show chassis synchronization clock-modulere0:
--------------------------------------------------------------------------
Clock module on SCB0
Current role : master
Current state : locked to xe-2/0/10
State for : 29 days, 10 hrs, 06 mins, 23 secs
State since : Wed Jun 7 21:55:23 2014
Monitored clock sources
Interface Type Status
xe-2/0/10 syncE qualified-selected
show chassis synchronization extensive (configured external clock interface)
user@host> show chassis synchronization extensiveCurrent clock status : Free-run
Configured interfaces:
Name : external
Signal type : e1 (g704 ami sa4)
Rx status : loss of signal
Tx status : squelched
LED color : red
Configured outputs:
Interface : external
Tx status : squelched (holdover data invalid)
Minimum QL : SEC Tx QL : DNU
Holdover mode : enabled Wander filter : disabled
Source mode : chassis Source Tx DNU : disabled
Holdover data : invalid
Current state : holdover
State for : 2 days, 06 hrs, 03 mins, 46 secs
State since : Wed Nov 14 08:02:09 2012
Configured sources:
Interface : external
Status : n/a Index : 0
Clock source state : n/a Priority : Default(6)
Configured QL : SSU-A ESMC QL : DNU
Clock source type : extern Clock Event : n/a
Interface State : Dn,ESMC Rx(SSM 0xf),
Ineligibility reason: Link Down,