OSN1500 BPS Protection Documentation

OptiX OSN 1500 Product Documentation

Product Version: V200R012C01 Library Version: 04

Date: 09/30/2014

For any question, please contact us.

Copyright © Huawei Technologies Co., Ltd. 2014. All rights reserved.

BPS 目录 1 BPS 1.1 Introduction to BPS 1.2 Basic Concepts 1.3 Specifications 1.4 Reference Standards and Protocols 1.5 Availability 1.6 Feature Dependency and Limitation 1.7 Principle Description 1.8 Networking and Application 1.9 Configuring BPS for Data Boards 1.9.1 Configuring BPS for Data Boards 1.9.2 Querying the Status of a BPS Protection Group 1.9.3 Deleting a BPS Protection Group 1.9.4 Manually Performing Switching of a BPS Protection Group 1.10 Verifying the BPS Protection Group 1.11 Troubleshooting 1.12 Relevant Alarms and Performance Events 1.13 Parameter Description: BPS Configuration

1 BPS Board protection switching (BPS) is used to protect services on the entire data board. When the working board fails, the BPS enables services to switch to the protection board in an accepted period. In this manner, 1+1 board-level protection is achieved for

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important services.

Introduction to BPS BPS is used to protect services on the entire data board. When the working board fails, the BPS enables services on the working board to switch to the protection board in an accepted period. In this manner, 1+1 board-level protection is achieved for important services.

Basic Concepts This topic describes basic concepts of the BPS.

Specifications This section describes the capacity of the OptiX OSN equipment for supporting BPS.

Reference Standards and Protocols BPS complies with BPS design specifications developed by Huawei.

Availability The BPS function requires the support of the applicable equipment, boards, and software.

Feature Dependency and Limitation This section describes the limitations on and precautions for BPS in the network design phase, configuration and commissioning phase, and maintenance phase.

Principle Description This topic describes function principle of the BPS.

Networking and Application You can use the BPS function to protect Ethernet lines between the client-side equipment and SDH network.

Configuring BPS for Data Boards After you configure BPS for data boards, board-level protection can be achieved. When the working board becomes faulty, services can be switched to the protection board.

Verifying the BPS Protection Group To check whether a BPS protection group functions normally, you can simulate a failure of the working board and query the associated alarms.

Troubleshooting Following a certain troubleshooting flow can facilitate fault locating and rectification.

Relevant Alarms and Performance Events None.

Parameter Description: BPS Configuration This section describes the parameters for configuring the BPS.

Parent topic: TDM Features




1.1 Introduction to BPS BPS is used to protect services on the entire data board. When the working board fails, the BPS enables services on the working board to switch to the protection board in an accepted period. In this manner, 1+1 board-level protection is achieved for important services.

BPS technology inherits the dually-fed and selectively-receiving technology of SDH cross-connect lines on traditional optical equipment, and combines specific networking applications of the bearer Ethernet transport network. This improves the network reliability of bandwidth transport greatly. If a data board of the opposite equipment, a data board of the local equipment, or the physical connection line between the board of the opposite equipment and the data board fails, BPS can be switched to the protection board automatically so that the system can be restored in time.

NOTE: The interconnected equipment should support 1+1 link protection. The status of physical ports is checked to realize the switching in cooperation with the BPS.

Parent topic: BPS

1.2 Basic Concepts This topic describes basic concepts of the BPS.

Working Board The working board refers to the board on which services run normally. You can configure protection services for these services. This board is also called active board.

Protection Board When the working board fails, the protection board takes over, to ensure normal running of services on the working board. This board is also called standby board.

Master Mode and Slave Mode Master mode: In this mode, the equipment that is interconnected with the local equipment selects the working port passively; the working and protection boards at the local end are in link up state, and the protection board at the opposite end is in link down state. Slave mode: In this mode, the working and protection boards at the local end are in link up state, and the working and protection boards at the opposite end are in link up state.

Idle State




l In this state, services on the working board run normally, and the protection board does not take over.

l In this state, the protection board takes over services and the working board works normally.

Auto State

l In this state, an automatic BPS switching occurs, and the protection board takes over.

l In this state, the working board works normally and the protection board is faulty.

l In this state, the working and protection boards are faulty.

When the working board fails or is offline, the data board works with the cross-connect board to detect the fault, determine whether to trigger a switching, and perform the switching.

Force State After the protection group receives the forced switching command, the protection group is changed to the force state. In this state, services are switched between the protection and working boards.

NOTE: After a forced switching to the working board, if the working board is faulty, the switching does not occur automatically in the protection group and you need to clear the switching manually.

Parent topic: BPS

1.3 Specifications This section describes the capacity of the OptiX OSN equipment for supporting BPS. Table 1 lists the specifications associated with BPS.

Table 1 Specifications associated with BPSItem Specifications

Revertive Mode Non-revertive mode

Switching Time ≤ 350 ms

Switching condition (Any of the conditions triggers the switching.)

l The port status of the working board is Link Down. l The clock of the working board is lost. l The hardware of the working board is faulty. l The working board is off-line. l A switching command is issued.

The bandwidth of the protection board is not less than the bandwidth of the working board.




Parent topic: BPS

1.4 Reference Standards and Protocols BPS complies with BPS design specifications developed by Huawei.

Parent topic: BPS

1.5 Availability The BPS function requires the support of the applicable equipment, boards, and software.

Version Support

Hardware Support

When a protection group needs to perform the BPS protection switching, the following conditions must be met. l The equipment interconnected with the protection group must have the same working

mode as the protection group. l The transmit end and the receive end should be connected directly through optical fibers or

network cables. No intermediate equipment should be present between the two ends. l The working mode should not be modified. Otherwise, the protection group becomes

abnormal.

NOTICE: The equipment cannot detect the modification of the working mode at the receive end of the protection group.

Applicable Equipment Applicable Version

OptiX OSN 1500/3500/7500 V100R006 and later

T2000 V200R004C01 and later

U2000 V100R002C00 and later

Applicable Equipment Applicable Version

OptiX OSN 7500 II V200R012C00 and later

U2000 V100R006C02 and later




Parent topic: BPS

1.6 Feature Dependency and Limitation This section describes the limitations on and precautions for BPS in the network design phase, configuration and commissioning phase, and maintenance phase.

Network Design Principles

Configuration and Commissioning Principles

Applicable Board Applicable Version Applicable Equipment

N1EMS4 V100R006 and later OptiX OSN 1500A/1500B/3500/7500

N1EGS4 V100R006 and later OptiX OSN 1500A/1500B/3500/7500

N3EGS4 V100R007 and later OptiX OSN 1500A/1500B/3500/7500

N4EGS4 OptiX OSN 1500A/1500B/3500/7500: V100R009 and later OptiX OSN 7500 II: V200R012C00 and later

OptiX OSN 1500A/1500B/3500/7500/7500 II

Applicable Object Dependency and Limitation Details

BPS protection in slave mode

l The GE electrical interfaces of the Ethernet boards support the BPS protection only in slave mode.

l The BPS protection in slave mode is supported by the OptiX OSN equipment series of the V100R009 version or a later version.

l The same master/slave mode must be set for the working and protection boards.


Configuring BPS for data boards

l The Ethernet boards must be installed in pairs. There must be no services on the protection board.

l The available bandwidth of the protection board is higher than or equal to the available bandwidth of the working board. In addition, the interface boards must be of the same type and quantity.

l The same board cannot be configured with BPS and PPS simultaneously.

l Before configuring the BPS for the EMS4 board, you must set the working mode of the corresponding interface board




Maintenance Principles

Parent topic: BPS

1.7 Principle Description This topic describes function principle of the BPS. BPS requires an active board and a standby board, to provide 1+1 and non-revertive active/standby protection to the equipment. During normal operation, the configuration information of the active board is the same as the configuration information of the standby board.

As shown in Figure 1, BPS involves the working board, the protection board, the cross-connect board, and the active and standby units of the interconnected equipment.

such as N1ETF8/N1EFF8 to 100M full-duplex.

BPS protection mode When Ethernet boards are interconnected with non-wireless equipment: l Setting BPS Protection Mode to Primary mode is

recommended. l Do not perform forced switching if BPS Protection Mode

can be set only to Secondary mode.


BPS switching l Once detecting a fault, which may occur at the local or opposite end, the local end initiates the BPS switching.

l The working mode of GE ports determines whether GE ports on protection boards emit light or not. n GE ports at both ends of a link working in 1000M full-

duplex mode: The GE ports on the protection boards do not emit light. After active/standby switching occurs, the GE port on the local working board does not emit light, but the GE port on the local protection board emits light; in addition, the GE port on the opposite working board does not emit light, but the GE port on the opposite protection board emits light.

n GE ports at both ends of a link working in auto-negotiation mode: If auto-negotiation is successful, the GE ports on the protection boards emit light as they work in 1000M full-duplex mode. If auto-negotiation fails, the GE ports on the protection boards do not emit light. After active/standby switching occurs, the GE port on the local working board does not emit light, but the GE port on the local protection board emits light; in addition, the GE port on the opposite working board does not emit light, but the GE port on the opposite protection board emits light.




Figure 1 BPS working principle

Switching Condition The BPS occurs when any of the following conditions is met:

l The port on the working board is faulty.

l A hardware fault occurs.

l The working board is offline.

Switching Process The process of a BPS switching is as follows:

1. The working board periodically checks the board hardware and its physical ports. If detecting any hardware fault or port LINK-DOWN, the working board notifies the cross-connect board immediately.

2. After receiving the fault notification from the working board, the cross-connect board checks whether the protection board is normal. If the protection board is normal, the cross-connect board issues the active/standby switching command immediately.

3. After receiving the switching command, the laser on the working board is disabled quickly. At the same time, the laser on the protection board is enabled.

4. After the laser on the working board is disabled, the working board at the opposite end is LINK-DOWN. After the laser on the protection board is enabled, the protection board at the opposite end is LINK-UP.

5. The working path is switched to the working or protection board according to the status of the working and protection boards. In this way, the BPS switching is implemented.

Parent topic: BPS




1.8 Networking and Application You can use the BPS function to protect Ethernet lines between the client-side equipment and SDH network.

On the access side of a network, the client-side equipment and SDH network can be interconnected through Ethernet lines, which can be protected by BPS. With this protection scheme, client services are dually fed to the access equipment of the SDH network. When one line is faulty, the SDH access equipment automatically switches the services to the other line. See Figure 1.

Figure 1 BPS application

Parent topic: BPS

1.9 Configuring BPS for Data Boards After you configure BPS for data boards, board-level protection can be achieved. When the working board becomes faulty, services can be switched to the protection board.

Configuring BPS for Data Boards For Ethernet boards, you can create a board-level protection group to provide 1+1 protection for the peripheral data equipment. When a fault occurs on the data equipment that is connected to the working board, the protection board selectively receives the services.

Querying the Status of a BPS Protection Group You can query the current status of a BPS protection group after you configure it.




Deleting a BPS Protection Group You can delete a BPS protection group after you configure it.

Manually Performing Switching of a BPS Protection Group You can manually perform switching of a BPS protection group to check whether the board-level protection switching of a data service board functions normally. If the board-level protection switching functions normally, services can be switched to the protection board in a timely manner when the working board becomes faulty.

Parent topic: BPS

1.9.1 Configuring BPS for Data Boards For Ethernet boards, you can create a board-level protection group to provide 1+1 protection for the peripheral data equipment. When a fault occurs on the data equipment that is connected to the working board, the protection board selectively receives the services.

Prerequisites

You are an NM user with Operator Group rights or higher.

Procedure

1. In the NE Explorer, select an NE and choose Configuration > Board-Level Protection from the Function Tree.

2. Click New and the Create Board-Level Protection Group dialog box is displayed. Select the Working Board and the Protection Board, and set Protection Group ID and BPS Protection Mode.

3. Click OK. A prompt dialog box is displayed, indicating that the operation is

successful. Click Close.

Parent topic: Configuring BPS for Data Boards




1.9.2 Querying the Status of a BPS Protection Group

You can query the current status of a BPS protection group after you configure it.

Prerequisites

l You are an NM user with Operator Group rights or higher.

l The BPS protection group must be configured.

Procedure

1. In the NE Explorer, select the NE and then choose Configuration > Board-Level Protection from the Function Tree.

2. Click Query. The current status of the BPS protection group is obtained.


1.9.3 Deleting a BPS Protection Group You can delete a BPS protection group after you configure it.

Prerequisites



Procedure


2. Select the protection group to be deleted, and then click Delete. The BPS protection group is deleted.


1.9.4 Manually Performing Switching of a BPS Protection Group




You can manually perform switching of a BPS protection group to check whether the board-level protection switching of a data service board functions normally. If the board-level protection switching functions normally, services can be switched to the protection board in a timely manner when the working board becomes faulty.

Prerequisites

l You are an NM user with Maintenance Group rights or higher.

l The BPS protection group must be created.

Procedure


2. Right-click the protection group that requires the switching, and then choose the command to trigger the manual switching.

3. A dialog box is displayed, indicating that the operation is successful. Click Close.


1.10 Verifying the BPS Protection Group To check whether a BPS protection group functions normally, you can simulate a failure of the working board and query the associated alarms.

Prerequisites



Procedure


2. Click Query. The current status of the BPS protection group is obtained.

NOTE: Before the protection switching, Active Board shows Working Board.

3. Disconnect the optical fiber from the working board.

4. Click Query to check whether the current status of the BPS protection group is normal.

NOTE:




After the protection switching, Active Board shows Protection Board. You can infer that the BPS protection group functions normally.

Parent topic: BPS

1.11 Troubleshooting Following a certain troubleshooting flow can facilitate fault locating and rectification.

Symptom The common BPS fault symptom is as follows: The status of the working board or protection board is abnormal.

Possible Causes

l The connection at the port fails.

l The working modes of ports are different.

Troubleshooting Flow Following a certain troubleshooting flow can facilitate fault locating and rectification.

Figure 1 Troubleshooting flowchart

Procedure

1. Cause 1: The connection at the port fails.




a. Check whether the ETH_LOS or LINK_ERR alarm is reported at the port on the working board or protection board.

b. If yes, clear the alarm and then check whether the fault is rectified. For details on how to clear the alarm, see the Alarms and Performance Events Reference.

2. Cause 2: The working modes of ports are different.

a. Check whether the working modes of the ports on the working board and on the protection board on the local equipment are the same as the working modes of the ports on the working board and on the protection board on the opposite equipment.

b. If the working modes are different, modify the working modes of these ports so that the ports on the local equipment and on the opposite equipment work in the same mode.

3. If the fault persists, contact Huawei technical support engineers to handle the fault.

Parent topic: BPS

1.12 Relevant Alarms and Performance Events

None.

Parent topic: BPS

1.13 Parameter Description: BPS Configuration

This section describes the parameters for configuring the BPS. Table 1 lists the parameters for configuring the BPS.

Table 1 Parameters for configuring the BPS

Parameter Value Description

Protection Group ID 1 to 65535 Displays the ID of the current protection group.

Working Board Example: 13-N4EGS4 Specifies the specified working board when a protection group is created.




Protection Board Example: 14-N4EGS4 Specifies the specified protection board when a protection group is created.

Active Board Working Board, Protection Board, Unknown

Displays the current working board.

Working Board Status Available, Unusable, Unknown

Displays the status of the current working board.

Protection Board Status Available, Unusable, Unknown

Displays the status of the current protection board.

Available Switching Conditions

Example: B2SD Displays the specified switching condition.

Switching Status Forced Switch Request, Auto Switching, Idle, Unknown Default value: Auto Switching

The Switching Status (BPS) parameter shows the status of BPS switching. l Forced Switch Request:

indicates that services in a protection group are forcibly switched by using switching commands.

l Auto Switching: indicates the switching status of the protection group, which results from the faulty Ethernet board.

l Idle: indicates that the working and protection boards are normal.

l Unknown: indicates that the switching status is unknown. You can learn about the current status through a query.

External Switching Command Type

Forced Switching to Working, Forced Switching to Protection, Clear Switching

External Switching Command Type (BPS) specifies that services in the BPS protection group are forcibly switched to the working board or protection board by running the external switching command. If the working board and protection board are normal, forced switching may lead to a transient service interruption. If either the working board or the protection board is faulty, forced switching may lead to a service interruption. l Forced Switching to




Parent topic: BPS

Working: indicates that services are forcibly switched from the protection board to working board. The switching neglects the status of the working channel, unless the working channel meets the bridging requirement of a higher priority.

l Forced Switching to Protection: indicates that services are forcibly switched from the working board to protection board. This switching neglects the status of the protection channel, unless the protection channel meets the bridging requirement of a higher priority.

l Clear Switching: indicates that the current switching status is cleared.

BPS Protection Mode Primary mode, Secondary mode

Specifies the protection mode of the BPS. l Primary mode: The port

on the opposite equipment is selected as the working port. The working and protection boards on the local equipment are in link up state. The protection board on the opposite equipment is in link down state.

l Secondary mode: The working and protection boards on the local equipment are in link up state. The working and protection boards on the opposite equipment are also in link up state.




Documents

OSN1500 BPS Protection Documentation