H3C S9500 Series Operating instructions

Brand: H3C

Model: S9500 Series

Type: Operating instructions

H3C S9500 Series, a high-performance routing switch, delivers scalable, flexible, and secure switching for large-scale data centers, carrier networks, and enterprise campus networks. With its advanced hardware architecture, the S9500 Series provides high-density 10/25/40/100GbE ports, supporting flexible deployment and service expansion. Its robust routing capabilities, including comprehensive IPv4/IPv6 features and advanced MPLS protocols, ensure reliable and efficient data transmission.

Operation Manual – Clock Monitoring

H3C S9500 Series Routing Switches Table of Contents

Table of Contents

Chapter 1 Clock Monitoring Configuration.................................................................................1-1

1.1 Clock Monitoring Module Overview...................................................................................1-1

1.1.1 Introduction to Clock Monitoring Module.................................................................1-1

1.1.2 Classification of Clock Sources...............................................................................1-2

1.1.3 Reference Source Level..........................................................................................1-2

1.1.4 Working Mode of the Clock Monitoring Module of the SRPU.................................1-3

1.1.5 Working Mode of the Port Clock .............................................................................1-3

1.2 Clock Monitoring Module Configuration Task List.............................................................1-4

1.3 Configuring Working Mode of the Clock Monitoring Module of the SRPU........................ 1-5

1.4 Configuring Reference Source Priority.............................................................................. 1-5

1.5 Configuring SSM for Reference Sources ..........................................................................1-5

1.5.1 Setting the Way of Deriving SSM Level..................................................................1-5

1.5.2 Setting the Bit Position for Transmitting Bits Clock Source Information.................1-6

1.5.3 Configuring SSM Levels for the Reference Source................................................1-6

1.5.4 Activating/Deactivating SSM...................................................................................1-7

1.6 Stopping the Clock Monitoring Module from Warming Up ................................................1-7

1.7 Setting the Input Port of the Line Clock (LPU Port)...........................................................1-7

1.8 Displaying and Maintaining Clock Monitoring Module.......................................................1-8

1.9 Clock Monitoring Module Configuration Example..............................................................1-9

Operation Manual – Clock Monitoring

H3C S9500 Series Routing Switches Chapter 1 Clock Monitoring Configuration

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Chapter 1 Clock Monitoring Configuration

When configuring clock monitoring module, go to these sections for information you are

interested in:

z Clock Monitoring Module Overview

z Clock Monitoring Module Configuration Task List

z Configuring Working Mode of the Clock Monitoring Module of the SRPU

z Configuring Reference Source Priority

z Configuring SSM for Reference Sources

z Stopping the Clock Monitoring Module from Warming Up

z Setting the Input Port of the Line Clock (LPU Port)

z Displaying and Maintaining Clock Monitoring Module

z Clock Monitoring Module Configuration Example

1.1 Clock Monitoring Module Overview

This section covers these topics:

z Introduction to Clock Monitoring Module

z Classification of Clock Sources

z Reference Source Level

z Working Mode of the Clock Monitoring Module

z Working Mode of the Port Clock

1.1.1 Introduction to Clock Monitoring Module

Clock monitoring module is responsible for providing highly-precise, highly-reliable

SDH (synchronous digital hierarchy) line interface 38.88 MHz clock signals for different

service interface cards. It implements such functions as input clock source automatic

selection, software phase-lock, and real-time monitoring of the clock status of the

interface card.

Currently, the clock monitoring module supports 18 reference clock sources (referred to

as reference source hereafter), among which the first and the second are Bits clock

sources and others are line clock sources. Each reference source corresponds to a slot.

The specific relationship is decided by device hardware. The following figure shows the

reference-slot relationship of the S9500 series switches:

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S9502

S9505

S9508

S9512

S9502

S9505

S9508

S9512

Figure 1-1 Relationship between reference source and slot

1.1.2 Classification of Clock Sources

Clock sources can be classified into three categories according to different sources of

the clock source of the clock monitoring module:

z Local clock source: 38.88 MHz clock signals generated by a crystal oscillator

inside the clock monitoring module.

z Bits clock source: clock signals generated by a Bits clock device. The signals are

sent to the clock monitoring module through a specific interface on the SRPU

(switch and router processing unit) and then sent to all interface cards by the clock

monitoring module.

z Line clock source: clock signals provided by the upper level device. Its precision is

lower than Bits clock source. The signals are derived from the specific WAN

interface and then sent to the clock monitoring module, which sends the signals to

all interface cards in turn.

1.1.3 Reference Source Level

The reference source level is decided together by the priority and the synchronization

status marker (SSM) level of the reference source.

I. Priority of the reference source

You can set a high priority for the reference source with high-precision and

high-reliability to make it be selected as the clock source with precedence.

II. SSM level of the reference source

SSM, also known as synchronization quality marker, is used to indicate the

synchronization timing signal level on a synchronization timing transmission link.

The priority of SSM level of the reference source, ranging from high to low includes:

z PRC: G.811 clock signal

z TNC: G.812 transit node clock signal

z LNC: G.812 local node clock signal

z SETS: SDH device clock source signal

z unknown: Unknown synchronization quality

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z DNU: DoNotUse

The reference source whose SSM level is DNU cannot be used as a clock source.

1.1.4 Working Mode of the Clock Monitoring Module of the SRPU

The working mode of the clock monitoring module is also the mode it adopts to choose

the clock source, including the manual mode and the auto mode.

I. Manual mode

In this mode, the clock source is configured manually. The clock monitoring module

does not switch the clock source automatically, but just tracks the user-configured

primary reference source. If the primary reference source is lost, the clock monitoring

module enters a hold state.

II. Auto mode

In auto mode, the clock source is selected by the system automatically. When the

primary clock source is lost or in free run status, the clock monitoring module selects

another clock source based on the following rules:

z If SSM level is not activated, the clock source is decided by reference source

priority. If two reference sources have the same priority, the one with the smaller

reference source number (1 to 18) is selected. When the reference source with the

highest priority is missing, the next available reference source with the highest

priority is selected. When the former clock source becomes available, the system

switches to that clock again.

z If SSM is activated, the clock source is decided by the SSM level. If two reference

sources have the same SSM level, the reference source priority takes effect, in the

way described above.

 Note:

The following clock sources are excluded in clock selection (when SSM is activated):

z Clock sources whose signals are missing;

z Clock sources whose priority is 255. By default, the priority of all clock sources is

255.

z Clock sources whose SSM level is DNU (DoNotUse).

1.1.5 Working Mode of the Port Clock

Depending on the source of the port clock, a port of an S9500 series switch supports

two clock modes:

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I. Master mode

In this mode, the system uses the clock signals provided by the clock monitoring

module. The signals include local clock signals and clock signals derived from LPU Port.

If you have configured on the device to derive clock signals from LPU Port, these

derived signals are adopted; otherwise, local clock signals are adopted.

II. Slave mode

In this mode, the system uses line clock signals. Only when you specify a port as the

LPU Port (clock signal input port) of the device can the system derive the clock source

from the line signals received on the port and then send the clock source information to

the clock monitoring module, which then sends the information to all interface cards.

When connected to SONET/SDH switches, a switch should be configured as to work in

slave clock mode, because the SONET/SDH network clock is more precise than that of

the switch.

1.2 Clock Monitoring Module Configuration Task List

 Note:

The following configurations are applicable to the S9500 series Ethernet switches

whose SRPU is installed with a clock module. For information about the SRPUs

installed with a clock module, refer to Installation Manual.

Complete these tasks to configure clock monitoring module:

Task Remarks

Configuring Working Mode of the Clock Monitoring Module of the

SRPU

Optional

Configuring Reference Source Priority Optional

Setting the Way of Deriving SSM Level Optional

Setting the Bit Position for Transmitting Bits Clock

Source Information

Optional

Configuring SSM Levels for the Reference Source Optional

Configuring

SSM for

Reference

Sources

Activating/Deactivating SSM Optional

Stopping the Clock Monitoring Module from Warming Up Optional

Setting the Input Port of the Line Clock Optional

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1.3 Configuring Working Mode of the Clock Monitoring

Module of the SRPU

To do… Use the command… Remarks

Enter system view

system-view

—

Configure the work mode

of the clock monitoring

module

clock { auto | manual

source source-number }

Optional

Auto mode by default

1.4 Configuring Reference Source Priority

In auto mode, the clock monitoring module selects a reference source based on SSM

level and reference source priority.

Follow these steps to configure reference source priority:

To do… Use the command… Remarks

Enter system view

system-view

—

Configure the reference

source priority

clock priority value

source source-number

Required

255 by default.

1.5 Configuring SSM for Reference Sources

1.5.1 Setting the Way of Deriving SSM Level

You can use the following two ways to derive the SSM level of a reference source:

z The interface card derives the SSM level from the Bits clock source, and reports

the SSM level to the SRPU, which sends the SSM level to the clock monitoring

module.

z Or you can configure SSM level as needed, as shown in the table in Configuring

SSM Levels for the Reference Source

Follow these steps to set the way of deriving SSM level:

To do… Use the command… Remarks

Enter system view

system-view

—

Set the way to derive SSM

level

clock forcessm { on |

off } source

source-number

Optional

By default, the SSM level

is set by users.

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1.5.2 Setting the Bit Position for Transmitting Bits Clock Source Information

The bits for transmitting Bits clock source information can be configured as sa4, sa5,

sa6, sa7 and sa8. They are 5 bits in timeslot 0 of the even frame in a multi-frame as

specified by ITU-TG.704 CRC4. The network administrator can choose one from the

five bits to carry SSM information.

Follow these steps to set the bit for transmitting Bits clock source information:

To do… Use the command… Remarks

Enter system view

system-view

—

Set the bits for

transmitting the Bits clock

source information

clock sa-bit { sa4 | sa5 |

sa6 | sa7 | sa8 } source

source-number

Optional

sa4 is the default bit for

transmitting the Bits clock

source information.

1.5.3 Configuring SSM Levels for the Reference Source

Follow these rules to manually set the SSM level for the clock source:

z For the line clock source, the SSM level configured is that of the clock source.

z For Bits clock source, if the input signal is a 2048 kbps (E1) signal and the clock

forcessm off source is executed, the clock source adopts the SSM level derived

from the input signals and the SSM configured is omitted.

z For Bits clock source, if the input signal is a 2048 KHz signal or a 2048 kbps signal

and the clock forcesssm on source command is executed, the clock source

adopts the SSM level configured.

Follow these steps to set the SSM level:

To do… Use the command… Remarks

Enter system view

system-view

—

Set the SSM level of the

reference source

clock ssm { dnu | lnc |

prc | sets | tnc |

unknown } source

source-number

Required

By default, the SSM level

of all reference sources is

unknown.

 Note:

The reference source with the SSM level being DNU cannot be used as a clock source.

Therefore, it does not participate in clock source switch when the clock monitoring

module works in auto mode.

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1.5.4 Activating/Deactivating SSM

No matter the SSM levels are obtained through clock signals or configured manually,

you have to activate them before they can take effect.

z When SSM is activated, the SSM levels become the decisive factor in clock

source automatic selection.

z When SSM is not activated, you can still set and view the SSM levels, but they are

ignored in clock source automatic selection.

Follow these steps to activate or deactivate SSM:

To do… Use the command… Remarks

Enter system view

system-view

—

Activate/deactivate SSM

clock ssmcontrol { on |

off }

Optional

SSM is deactivated by

default.

1.6 Stopping the Clock Monitoring Module from Warming Up

To do… Use the command… Remarks

Enter system view

system-view

—

Stop the clock monitoring

module from warming up

clock stop warm-up

Required

1.7 Setting the Input Port of the Line Clock (LPU Port)

To do… Use the command… Remarks

Enter system view

system-view

—

Set the LPU port of the

line clock

clock lpuport

{ interface-type

interface-number }

Optional

By default, the clock LPU

port is the first

configurable port by port

name in alphabetical

order of the interface

board

Enter interface view

interface interface-type

interface-number

—

Set the LPU port to work

in Slave mode

clock slave

Optional

The LPU port works in

Slave mode by default.

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H3C S9500 Series Routing Switches Chapter 1 Clock Monitoring Configuration

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 Note:

For a POS interface card, if you set the port clock to work in Slave mode, you must use

the clock lpuport command to set the LPU port of the clock source of the interface

card.

1.8 Displaying and Maintaining Clock Monitoring Module

To do… Use the command… Remarks

View the clock base

phase

display clock

basephase

View the current

configuration of the clock

monitoring module

display clock config

View the detailed

information of the clock

monitoring module

display clock device

View the D/A value of the

DAC inside the clock

monitoring module

display clock d/a

View the input clock

source port of the line

board

display clock lpuport

View the lock state of the

clock monitoring module

display clock

phase-lock-state

View the priority of all

reference sources

display clock priority

View the self-test result of

the clock monitoring

module

display clock

self-test-result

View the state of all

reference sources

display clock source

View the SSM level of all

reference sources

display clock ssm-level

View the SSM level of the

output clock signal.

display clock

ssm-output

View the clock monitoring

module version

display clock version

View the work mode of the

clock monitoring module

of the SRPU

display clock

work-mode

Available in any view

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1.9 Clock Monitoring Module Configuration Example

I. Network requirements

z Two S9508 switches Switch A and Switch B are connected through their POS

interfaces. They are equipped with the clock monitoring modules on their SRPUs,

and thus you can configure the synchronization clock parameters.

z The synchronization clock of Switch A is provided by its clock monitoring module.

z Switch B adopts the line clock from Switch A to synchronize with the SDH line of

Switch A.

II. Network diagram

Figure 1-2 Network diagram of system clock configuration

III. Configuration procedure

1) Configure Switch A (Master clock).

# Set the interface POS 1/1/1 to work in master clock mode, using local clock signals.

<Sysname> system-view

[Sysname] interface pos 1/1/1

[Sysname-Pos1/1/1] clock master

2) Configure Switch B (Slave clock).

# Set the LPU port on Switch B to POS 1/1/1.

<Sysname> system-view

[Sysname] clock lpuport pos 1/1/1

# Set the interface POS 1/1/1 to work in slave clock mode.

[Sysname] interface pos 1/1/1

[Sysname-Pos1/1/1] clock slave

# Enable the clock source obtained from POS 1/1/1; set the clock to work in manual

mode and use clock source 8 as the primary clock source, which corresponds to slot 1

(refer to

Figure 1-1).

[Sysname] clock manual source 8

Through the above configurations, all the other POS interface cards get the same clock

frequency derived by the clock module from the line clock of POS 1/1/1. In this way, all

the service cards of the switch can get precise, reliable, synchronized SDH line

interface.

H3C S9500 Series Operating instructions

H3C S9500 Series Operating instructions

H3C S9500 Series Operating instructions

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