OSN1500 SSN1EMS4 single board is an Ethernet switching processing board, which is mainly used to solve the telecommunication application areas such as Ethernet service access, bandwidth management, and Layer 2 switching of Ethernet services.The EMS4 single board supports the functions and features of Layer 2 switching, link aggregation, and multicast, etc. The EMS4 single board consists of an Ethernet access module, a mapping module, a logic control module, and a power supply module. The single board consists of an Ethernet access module, a network processing module, a mapping module, an interface conversion module, a logic control module, a clock module, and a power module. The panel of the single board contains single board indicators, interfaces, bar codes, and laser security levels. The single board indicators contain optical interface indicators, electrical interface indicators, laser safety level, Ethernet performance indicators, mechanical indicators and power consumption. Typical networking applications of Ethernet switching processing board can realize Ethernet access, aggregation, Layer 2 switching of Ethernet data, port isolation, flow classification, data flow control, VLAN management, priority configuration and other data features, as well as data encapsulation/decapsulation, virtual cascade, SDH mapping/demapping and other functions. At the same time, it can be docked with broadband access equipment and digital communication equipment to provide a network-wide solution.

Introduction to Metro1000 V3

The OptiX 155/622H has a box-integrated design that can be used alone or integrated into a 220V chassis. The dimensions of the box are: 436mm (L) x 293mm (W) x 86mm (H) OptiX 155/622H provides perfect network protection mechanism for all kinds of services, and on the basis of SDH protection mechanism, it adds data link layer protection for Ethernet services, forming layered protection for services. It supports tracking multiple clock sources and supports clock synchronization under SSM management. Meanwhile, the OptiX 155/622H supports high-precision time synchronization and meets the IEEE 1588 V2 recommendations.The OptiX 155/622H is an STM-1/STM-4/STM-16 class box device developed by Huawei Technologies Co Ltd, and it can be accessed to a variety of service types, and is applied to the access layer of metro networks and local transmission networks for large-customer leased line access, mobile base station access, and DSLAM access. There are two power input interfaces on the panel of the power filter board, which can access two -48V or two +24V power supplies at the same time, and the two power supplies are backup for each other. There is a ground terminal on the lower right side of the power input connector, which is used to connect to the PGND terminal of the power line.

OSN product EMS4 pairs EPL service with metro1000V3EFS veneer, and finds that when the vctrunk port of the data veneer is set to tag attribute, the test frame does not pass; when the vctrunk port of the data veneer is set to access attribute, the test frame passes; however, the actual service is normal.EMS4: 4.13 EFS: 2.21

1. For EFS single board version 2.21, the single board only supports MAC bearer test frame.

2、For EMS4 single wave version 4.13, the single board supports MAC bearer and GFP bearer test frame.

For EFS single board, the test frames sent in MAC bearer mode are without VLAN data, that is, these packets are transmitted on the line without VLAN. At the same time, the single board receives the test frames without distinguishing whether they are with or without VLANs. That is, both sides of the vctrunk port set any tag attribute, the test frame is through, this has been verified in the laboratory.

4, for the EMS4 single board, that can receive MAC bearer test frames and can receive GFP bearer mode, but for the reception of MAC bearer test frames, will go to identify the test frame is not with VLAN.

5, when the EMS4 single board and EFS single board pairs of business, EMS4 single board sends test frames, at the same time, will send two ways of test frames, but after reaching the EFS single board, can only receive MAC test frames, at the same time, respond to the MAC test frames, the EFS single board responds to test frames are not with VLANs, and after arriving at the EMS4 single board, due to the EMS4 single board will go to the identification of test frames If it is not with VLAN, it will discard the ports with TAG attribute and allow the ACCESS ports to enter. This leads to the problem.

Root Cause

The test frames are not carried in the same way.2. There is a difference in the way the single board recognizes the test frames.

Suggestion and Summary

1. Upgrade the EFS board on the metro1000V3 equipment to version 2.42, which supports test frames in MAC bearer mode and test frames in GFP bearer mode, so that the problem does not occur.

2, all products EFS single board early version of the board only supports MAC bearer test frames have this problem, you need to upgrade to the corresponding support for two bearer version.

3, EMS4 single board and EFT single board docking will not have this problem, because the EFT single board only supports GFP bearer test frame.