Hardware Information of Huawei S5700 Series Ethernet Switches

Hardware modules of Huawei S5700 refer to the interface card, SCU (Switch Control Unit), power
supply, and fan.

Logical structure of hardware modules

SCU
The SCU is fixed on the S5700 like S5700-28C-EI-24S. Each S5700 has one SCU.
The SCU is responsible for packet switching and device management. It integrates multiple
functional modules, namely, the main control module, switching module, and interface
module.
Main Control Module
The main control module implements the following functions:
Processing protocols
Functioning as an agent of the user to manage the system and monitor the system
performance according to instructions of the user, and report the running status of the
device to the user
Monitoring and maintaining the interface module and switching module on the SCU
Switching Module
The switching module, also called the switching fabric, is responsible for packet exchange,
multicast replication, QoS scheduling, and access control on the interface module of the SCU.
The switching module adopts high performance chips to implement line-speed forwarding and
fast switching of data with different priorities.
Interface Module
The interface module provides Ethernet interfaces for accessing Ethernet services.
Cards
The S5700 supports service and stack cards. Service cards allow flexible networking and
provide cost-effective and customized solutions. Stack cards connect multiple switches into
one logical switch, which implements on-demand expansion, reduces investments, simplifies
management, and improves network reliability.

Huawei OSN3500 Introduction

Positioning

Huawei OptiX OSN 3500 intelligent optical transmission system (the OptiX OSN 3500 for short) developed by Huawei is the next-generation intelligent optical transmission equipment.

Huawei OptiX OSN 3500 is of a "universal switch" architecture. That is, the OptiX OSN 3500 can be used in packet mode or in TDM mode. When used with the other equipment of Huawei, the OptiX OSN 3500 supports various networking applications, such as the pure packet mode application, hybrid networking application (overlay networking of the packet mode and TDM mode), and pure TDM mode application. By using a proper networking solution, the data service and conventional SDH service can be processed in the optimal manner.

Technology

The OptiX OSN 3500 transmits voice and data services on the same platform with high efficiency. It integrates the following technologies:

• In packet mode, the OptiX OSN 3500 supports the following technologies:
  • Multiprotocol Label Switching (MPLS)
  • Multiprotocol Label Switching Transport Profile (MPLS-TP)
  • Pseudo Wire Edge to Edge Emulation (ETH PWE3)
  • TDM PWE3
  • ATM PWE3
• In TDM mode, the OptiX OSN 3500 supports the following technologies:
  • Synchronous digital hierarchy (SDH)
  • Plesiochronous digital hierarchy (PDH)
  • Ethernet
  • Asynchronous transfer mode (ATM)
  • Storage area network (SAN)/Video
  • Wavelength division multiplexing (WDM)
  • Digital data network (DDN)
  • Pulse Code Modulation (PCM)

Exterior of the OptiX OSN 3500 

Network Application

As shown in Figure, the OptiX OSN 3500 is mainly used at the convergence layer and backbone layer of the metropolitan area network (MAN). The network application scenarios are described as follows:

• In TDM networking, can be networked with the other OptiX transmission equipment (the OptiX OSN 9560, OptiX OSN 9500, OptiX OSN 7500 II, OptiX OSN 7500, OptiX OSN 3500 II, OptiX OSN 2500, OptiX OSN 1500, OptiX OSN 500, and OptiX OSN 550) to optimize the carrier's investment.
• With the packet switching technology, can constitute a packet data transmission network with the other OptiX transmission equipment (the OptiX OSN 7500 II, OptiX OSN 7500, OptiX OSN 1500, OptiX OSN 500, OptiX OSN 550, OptiX PTN 910, OptiX PTN 950, OptiX PTN 1900, OptiX PTN 3900, and OptiX RTN 900) to meet the requirement for bearing IP services.
• Can be flexibly networked with WDM equipment and Huawei Metro equipment.
• Can transparently transmit services over third-party Layer 2 networks, allowing end-to-end configuration and management.

How to Measure the Transmit Optical Power of an Huawei OLT PON Port?

Check whether the optical module on a PON port of the OLT works properly by measuring the transmit optical power.

Prerequisites

• The OLT is powered on.
• The PON board is in the normal state.
• The PON port is enabled.

Tools, Meters and Materials

• Single-mode fiber jumper with the SC/PC connector. No longer than 1 m. Best to use new jumper.
• Burst optical power meter or ordinary optical power meter.

Impact on the System
When the transmit optical power of a PON port on Huawei OLT is measured, the PON port will fail to transmit any service.

Precautions
Before or after measuring the optical power, you need to clean the connector of the optical fiber. This is because if a contaminated optical fiber is connected to a normal optical fiber connector, the connector will be contaminated, which leads to abnormal attenuation and reflection and thus affecting optical path quality.

Procedure
Step 1 Configuring the measure parameters of the optical power meter.
Unit of optical power: dBm
Wavelength: 1490 nm
Step 2 Connect the optical power meter directly to the optical module on the OLT PON port using optical fiber jumper, as shown in Figure The value on the optical power meter is the transmit optical power of Huawei OLT MA5800 PON port.

• If the value on the optical power meter changes within a range of 0.2 dBm, take the average value.
• If the value on the optical power meter changes in a range wider than 0.2 dBm, then it is possible that the fiber is not properly connected, the fiber is excessively bent, or the fiber connector has dust.
• Do not bend the fiber. A bent fiber may affect the test result.

Step 3 Compare the test result with the optical module parameters of the corresponding board in the hardware description.

Huawei S6720S-26Q-EI-24S-AC switch Power Supply Configuration

Power Supply Configuration of S6720S-26Q-EI-24S-AC

An Huawei S6720S-EI switch can have one or two power modules installed.

When a switch has two power modules installed, the two power modules work in 1+1 redundancy mode. AC and DC power modules can be used together in the same switch.

Figure 1 shows the power supply connections of dual DC power modules. After DC power is transmitted to the PWR module, the PWR module provides 12 V output voltage, and the motherboard provides power for the entire device.

Power supply connections of dual DC power modules 

Figure 2 shows the power supply connections of dual non-PoE AC power modules. After AC power is transmitted to the PWR module, the PWR module provides 12 V output voltage, and the motherboard provides power for the entire device.

Power supply connections of dual non-PoE 170 W AC power module.

What is the Protection Relationship among Huawei OSN Products?

TPS protection relationship of all Huawei OSN products is listed as follows:

Huawei OSN 7500:

E1/T1: A maximum of one group of 1:4 protection. Slot 1 protects Slots 2, 3, 7 and 18.

E3/D3/E4/STM-1e: A maximum of one group of 1:3 protection. Slot 18 protects Slots 2, 3 and 7. 

Huawei OSN 3500:

E1/T1: A maximum of one group of 1:8 protection. Slot 1 protects Slots 2–5, 13–16.

E3/D3/E4/STM-1e: A maximum of two groups of 1:3 protection. Slot 2 protects Slots 3, 4 and 5. Slot 16 protects Slots 13, 14 and 15. A maximum of two groups of 1:1 protection. Slot 2 protects Slot 3 and Slot 16 protects Slot 15.

Huawei OSN 2500:

E1/T: If slots are not split, there is a maximum of one group of 1:4 protection. Slot 5 protects Slots 6, 7, 12 and 13. If Slots 5, 6 and 7 are split, there are a maximum of two groups of 1:2 protection. Slot 5 protects Slots 6 and 7. Slot 19 protects Slots 20 and 21.

E3/D3/E4/STM-1e: A maximum of two groups of 1:1 protection. Slot 6 protects Slot 7, and Slot 13 protects Slot 12.

Huawei OSN 2500CRG:

The OSN2500CRG does not support TPS protection.

Huawei OSN 1500I:

E1/T1: If slots are not split, there is a maximum of one group of 1:2 protection. Slot 11 protects Slots 12 and 13. If Slots 11, 12 and 13 are split, there is a maximum of one group of 1:2 protection. Slot 1 protects Slots 2 and 3, Slots 6 protects Slots 7 and 8, and Slot 11 protects Slots 12 and 13.

E3/D3/E4/STM-1e: A maximum of two groups of 1:1 protection. Slot 12 protects Slot 13.

Huawei OSN 1500II:

E1/T1: If slots are split, there is a maximum of one group of 1:1 protection. Slot 2 protects Slot 12. 

What Is the Relationship Between the LOF and LOS Alarms?

How to detect LOF and LOS alarms and what is the relationship between these two alarms? What alarm is generated if optical fibers are removed when Huawei MA5606T or MA5652G serves as an Huawei ONU?

LOF indicates loss of frame. When such an alarm is generated, the ONU can receive optical signals. LOS indicates loss of signal. When such an alarm is generated, the ONU fails to receive optical signals. The mechanisms of detecting LOFi and LOSi alarms are as follows:

• LOFi: If four consecutive frames of an OLT fail to locate an upstream frame of an ONU, the LOFi alarm is generated and the ONU goes offline.
• LOSi: If four consecutive frames of Huawei OLT fail to receive an upstream optical signal of an ONU, the LOFi alarm is generated and the ONU goes offline.

The relationship between the LOF and LOS alarms is as follows:

• Use an optical attenuator to test the ATM 155/622 Mbit/s optical port and increase the attenuation gradually. It is found that the alarm status changes as follows: normal -> SD -> LOF -> LOS. This indicates that after LOF is generated, if the attenuation is increased further, no optical signal is received and LOS is generated. If an optical fiber is removed, LOF may be generated first and then LOS, which is related to the alarm detection mechanism. The LOSi, LOFi, and LCDGi alarms are detected in the time window mode. In the first several detections, if the time window detects the threshold for frame losing, the LOFi alarm will be generated.
• If the PON line generates an LOF alarm, LOS will not be generated. This is because the PON port uses the time division system. If an LOF alarm is generated, the ONT goes offline and then the OLT like MA5603T does not assign the timeslot (bandwidth) to the ONU. Therefore, the OLT does not detect whether the ONT transmits upstream optical signals and an LOS alarm is not generated.
• If LOS is generated, LOF/SD will be suppressed. This is because LOS is the alarm of the highest severity.

When the MA5606T and MA5652G serve as an ONU and the optical patch is normal, LOS is generated when an optical fiber is removed.

How to Operate MAC Address Table Configuration?

How to Configure MAC Address Table on Huawei S2300 and S3300 Switch

Networking Requirements
As shown in Figure, the MAC address of the user host PC1 is 0002-0002-0002 and that
of the user host PC2 is 0003-0003-0003. PC1 and PC2 are connected to the Switch through the
LSW. The LSW is connected to Eth0/0/1 of the Switch, which belongs to VLAN 2. The MAC
address of the server is 0004-0004-0004. The server is connected to Eth0/0/2 of the Switch.
Eth0/0/2 belongs to VLAN 2.

• To prevent hackers from using MAC addresses to attack the network, configure two static MAC address entries for each user host on the Switch.
• To prevent hackers from stealing user information by forging the MAC address of the server, configure a static MAC address entry on the Switch for the server.

Configuration Roadmap
The configuration roadmap is as follows:
1. Create a VLAN and add an interface to the VLAN to implement Layer 2 forwarding.
2. Configure static MAC address entries to prevent MAC address attacks.
3. Configure the aging time of dynamic MAC address entries to update the entries.

Procedure
Step 1 Configure static MAC address entries.
# Create VLAN 2 and add Ethernet0/0/1 and Ethernet0/0/2 to VLAN 2.
<Switch> system-view
[Switch] vlan 2
[Switch-vlan2] quit
[Switch] interface ethernet 0/0/1
[Switch-Ethernet0/0/1] port hybrid pvid vlan 2
[Switch-Ethernet0/0/1] port hybrid untagged vlan 2
[Switch-Ethernet0/0/1] quit
[Switch] interface ethernet 0/0/2
[Switch-Ethernet0/0/2] port hybrid pvid vlan 2
[Switch-Ethernet0/0/2] port hybrid untagged vlan 2
[Switch-Ethernet0/0/2] quit
# Configure a static MAC address entry.
[Switch] mac-address static 2-2-2 Ethernet 0/0/1 vlan 2
[Switch] mac-address static 3-3-3 Ethernet 0/0/1 vlan 2
[Switch] mac-address static 4-4-4 Ethernet 0/0/2 vlan 2
Step 2 Set the aging time of a dynamic MAC address entry.
[Switch] mac-address aging-time 500
Step 3 Verify the configuration.
# Run the display mac-address command in any view to check whether the static MAC address
entries are successfully added to the MAC address table.
[Switch] display mac-address static vlan 2
-------------------------------------------------------------------------------
MAC Address VLAN/VSI Learned-From Type
-------------------------------------------------------------------------------
0002-0002-0002 2/- Eth0/0/1 static
0003-0003-0003 2/- Eth0/0/1 static
0004-0004-0004 2/- Eth0/0/2 static
-------------------------------------------------------------------------------
Total items displayed = 3
# Run the display mac-address aging-time command in any view to check whether the aging
time of dynamic entries is set successfully.
[Switch] display mac-address aging-time

Aging time: 500 seconds

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