Huawei OTN Equipment Fails to Transparently Transmit Ethernet Clock Signals

Symptom Clocks between PTN equipment must be synchronized. Network AM using the OTN network architecture is configured between PTN equipment to transparently transmit clock signals from upstream PTN equipment to downstream PTN equipment or to implement network-wide clock synchronization. After the network is set up according to the network topology, the clock synchronization fails. The following figure shows the network topology. Figure 1 The Network Topology of AM Network  Cause Analysis The OptiX OSN 6800/OptiX OSN 8800 earlier than V100R006C01 cannot directly restore clock signals from 10GE services transmitted from PTN equipment. Therefore, clock signals are transparently transmitted from the upstream PTN equipment to the downstream PTN equipment. According to the network topology, PTN equipment transmits 10GE LAN services to the OTN network that consists of NG WDM equipment. The TN52TQX board is configured on the OptiX OSN 6800/OptiX OSN 8800 equipment and is set to the MAC Transparent Mapping (10.7G) mode. This network topology, however, cannot implement clock transparent transmission because of the MAC Transparent Mapping (10.7G) mode and Bit Transparent Mapping (11.1G) mode when clock signals are processed. 10GE LAN services can be set to 10GE LAN MAC Transparent Mapping (10.7G) mode or 10GE LAN Bit Transparent Mapping (11.1G) mode. The differences are as follows: ·         In the 10GE LAN MAC Transparent Mapping (10.7G) mode: 10GE LAN signals are encapsulated in the GFP-F mode and then mapped into standard OTU2 frames. In this mode, 10GE MAC frames are transparently transmitted. In addition, the equipment working in this mode supports standard OTU2 frames at the rate of 10.71 Gbit/s and can be interconnected with all equipment that supports standard protocol rates. In this mode, the local clock is traced and service clock signals cannot be transparently transmitted. ·         In the 10GE LAN Bit Transparent Mapping (11.1G) mode: Client 10GE LAN signals are directly mapped into OTU2 frames and transmitted at the rate of 11.1 Gbit/s. The transmission is implemented by extending the OTU2 frame structure and the transmission rate is higher than standard OTU2 signals. In this mode, the service clock is traced, and service clock signals can be transparently transmitted after the line rate is set to speed-up mode for the TN52TQX board. ·         To transmit link information in client services, you must set the MAC Transparent Mapping (10.7G) mode and enable the LPT function or set the Bit Transparent Mapping (11.1G)mode for the TN52TQX board. Procedure 1.    Set the Working Mode to Bit Transparent Mapping (11.1G) mode and the line rate to Speed-up Mode for the service board. Result The problem is resolved. Reference Information The NG WDM equipment traces the local clock or service clock based on the service type. Generally, the service clock is traced, and clock transparent transmission is supported when OTN boards are configured with the maximum supported cross-connect granularity and are set to the Speed-up Mode. Clock synchronization can be achieved by means of transparent transmission and network-wide clock synchronization. The OptiX OSN 6800/OptiX OSN 8800 earlier than V100R006C01 can only transparently transmit 10GE services and clocks between PTN equipment. The same is true for SDH services (transparent transmission is implemented using SDH boards). Network-wide clock synchronization can be achieved only when the TN52TOG board is interconnected to PTN equipment to transmit GE services. On the OTN network, the boards that support the IEEE 1588 feature can transmit physical clocks.

SmartAX MA5800 Multi-service Access Module V100R1017C00 Specification List

Huawei SmartAX MA5800 Multi-service Access Module V100R1017C00 Specification List

How to change the MTU value of a Layer 3 interface on Huawei MA5800?

In the VLANIF interface on Huawei MA5800, run the MTU command to set the value ranging from 1501 to 9600. However, the maximum length of Ethernet frames forwarded at Layer 2 is 9216. Therefore, the Layer 3 MTU and Ethernet header cannot exceed 9216. Otherwise, the set value will be discarded.

The default value is 1500.
After setting the maximum transmission unit (MTU) by running the mtu command on a VLANIF interface, this configuration takes effect only for this interface.

 Example: 
 Run the huawei(config-if-vlanif2)#mtu 1560 command.

 The detailed information is as follows:
    Line protocol current state : UP
 huawei(config)#display interface vlanif 2
 vlanif2 current state : UP
 Description: HUAWEI, SmartAX Series, vlanif2 Interface
 The Maximum Transmit Unit is 1560 bytes
 Forward plane MTU is 1560 bytes
 Internet protocol processing : disabled
 IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 00e0-fc11-2233
 VLAN Encap-mode : double-tag, inner-label is 2

How many versions does Huawei OSN 8800 Optical Amplifier Board OAU1 have?

AU1 is a WDM optical amplifier board, to amplify C band optical signals at different Gain Ranges; OAU1 has three versions TN11, TN12 and TN13.

TN11OAU and TN12OAU will occupy two slots on Huawei OSN 6800 or Huawei OSN 8800; TN13OAU only occupies one slot.

Also they have function difference. TN11OAU1 board does not support adjustment of input optical power, whereas the TN12OAU1 and TN13OAU1 board supports

How to Replace an EOS EGS4 on Huawei OSN 3500?

Prerequisites

• You are an NM user with Operator Group rights or higher.
• The type and position of the board to be replaced must be confirmed.
• The old board and the new board have the same software version, and the new board does not contain any configurations.

Impact on System

The Ethernet boards Huawei EGS4 are classified into the transparent transmission boards and the switching boards. Replacing the boards of different types has the following impacts on services:

• If you replace a transparent transmission board, the services on the board are interrupted.
• When you replace a switching board, if the processing board is configured with the TPS/BPS/PPS/DLAG protection, the services on the processing board are protected.

Tools, Equipment, and Materials

Shielding bag, fiber extraction tool, and U2000

Procedure

1. Select the spare part.
   • Select the spare board that has the same parameters as the board to be replaced.
   • If the board to be replaced supports the board version replacement function, check for substitute boards.
2. Query and record the current alarms of the board.
3. If the board to be replaced is connected by fibers, record the positions of fiber connections and remove the fibers by using a fiber extraction tool.
4. Replace the board on the subrack of Huawei OSN 3500.
   When you remove or install the board, the BD_STATUS or COMMUN_FAIL alarm is reported. After the new board is online, the alarms are cleared automatically.

   The replacement considers the board that is configured with board-level protection as an example.

How to Back Up the NE Database to the SCC Board on Huawei DWDM Equipment?

You need to back up the NE database during daily maintenance, to ensure that Huawei TN52SCC board of the NE automatically restores to normal operation after a data loss or equipment power failure. When you back up the NE database to the SCC board, you actually back up the NE data in the DRDB database of the SCC board to the Flash database. When the NE is restarted after a power failure, the SCC board automatically reads the configuration from the FLASH and issues the configuration to the boards.

Prerequisite

You are an NMS user with "Administrators" privilege.

You must log in to the NE as an NE user with system level authority.

Tools, Equipment and Materials

U2000 or Web LCT

Precautions

By default, the NMS automatically backs up the NE database into the flash memory every 30 minutes.

Procedure on the U2000

1. Visit the following navigation path.
   
2. Back up the NE database to the SCC board on Huawei OSN 6800.
   

Procedure on the Web LCT

1. Select one or more NEs in the NE list. Click BackUp NE Database > BackUp to SCC.
   The NMS takes a few minutes to back up the NE database. Do not perform any operation in the process of backup.
2. Click OK in the confirmation dialog box.
3. Click Close in the Operation Result dialog box is displayed.

How to Implement the Binding of the IP Address and Interface?

Huawei Switch implements binding between an interface and an IP address through the traffic
policy and DHCP snooping. Then the interface allows only the packets with the bound IP
address and packets matching the DHCP snooping binding table to pass through. The Switch like Huawei 48-ports 10GE SFP+ switch S6720-54C-EI-48S-DC does support binding of IP address + MAC address + interface.
For example, to configure GigabitEthernet 0/0/8 to allow packets with the source IP address
being 192.168.130.50 apart from of the packets matching the DHCP snooping binding table,
and discard other packets, do as follows:
# Enable DHCP snooping globally.
[HUAWEI] dhcp snooping enable
# Configure an advanced ACL that matches source IP address 192.168.130.50.
[HUAWEI] acl 3000
[HUAWEI-acl-adv-3000] rule 5 permit ip source 192.168.130.50 0
[HUAWEI-acl-adv-3000] rule 10 deny ip source any
[HUAWEI-acl-adv-3000] rule 15 deny ip destination any
[HUAWEI-acl-adv-3000] quit
# Create a traffic classifier that matches the advanced ACL.
[HUAWEI] traffic classifier c1
[HUAWEI-classifier-c1] if-match acl 3000
[HUAWEI-classifier-c1] quit
# Create a traffic behavior and a traffic policy.
[HUAWEI] traffic behavior b1
[HUAWEI-behavior-b1] permit
[HUAWEI-behavior-b1] quit
[HUAWEI] traffic policy p1
[HUAWEI-trafficpolicy-p1] classifier c1 behavior b1
[HUAWEI-trafficpolicy-p1] quit
# Apply the traffic policy to GigabitEthernet 0/0/8 so that the interface allows only the
packets with the source IP address 192.168.130.50 to pass through apart from of the packets
matching the DHCP snooping binding table.
In V100R005 and later versions, the configuration is as follows:
[HUAWEI] interface GigabitEthernet 0/0/8
[HUAWEI-GigabitEthernet0/0/8] port default vlan 4094
[HUAWEI-GigabitEthernet0/0/8] ip source check user-bind enable
[HUAWEI-GigabitEthernet0/0/8] traffic-policy p1 inbound