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OSN1500 LCAS is a method of dynamic adjustment of bandwidth in virtual cascade service. When the LCAS function is activated, the bandwidth of VCTRUNK can be dynamically adjusted without affecting the service.VCTRUNK1 is bound with four VC4s, the first two VC4s are transmitted through path 1, and the last two VC4s are transmitted through path 2. When the VC4 of path 1 fails, the service of the whole VCTRUCNK1 is not affected, and the Ethernet service is transmitted through the last two VC4s. Of course, it is also possible to add VC4s to any path, which will also not affect the service. Intelligent path group is to associate member paths belonging to the same LCAS service in an LSP group, and complete the addition, deletion and modification of these member paths in the ASON network. In order to make the virtual cascade service more fault-tolerant, these member paths need to be separated as much as possible. If the source and the host fail to enable LCAS at the same time, configuring channel binding before configuring the crossover service will result in abnormal LCAS negotiation and failure of configuring LCAS. Deleting the existing configurations at both the source and the host and enabling the LCAS function at the same time can eliminate this failure.
OptiX OSN 1500A
- OptiX OSN 1500A/1500B
- OptiX OSN 2500
- OptiX OSN 3500
- OptiX OSN 7500
Failure Category
- LCAS
- Ethernet Failure
Phenomenon Description
If LCAS is enabled on end A but not on end B of a point-to-point network, and the data boards on both ends are first bound to channels and then configured for cross services from the data boards to the line boards, an abnormality occurs in the LCAS negotiation on end A, and all the time slots are deleted or there is only one time slot left.
Cause Analysis
The causes of the above failures are mainly related to the current version of the LCAS function and the principle of its realization, so the following situations should be avoided during the actual configuration of the LCAS function:
- LCAS is not enabled at both ends at the same time
- Bind the channel first and then configure the cross-service
Procedure
- Query the LCAS function of the network elements at both ends to ensure that they are both enabled.
- Query the bound channels on the data boards at both ends and delete the existing configuration.
- Query the cross services from the data board to the line board and delete the existing cross services.
- Configure the cross service from the data board to the line board first, and then configure the bound channel on the data board. The alarm disappears and the problem is solved.
Each smart path group is identified by a group ID. the smart network element assigns a unique group ID to each smart service group. the member paths of a smart path group have the same source-host but the paths are separated as far as possible.
ASON supports the distance difference checking function for intelligent path groups. The delay due to the distance difference between intelligent services carrying data services must be within the range that the data board can support, or the data services will be interrupted without alarms.ASON supports automatic verification of whether the services in the group satisfy the distance difference requirement when the intelligent services bound through LCAS are added to the intelligent service group.
The technical information in this chapter and the related SDH equipment troubleshooting procedures are provided by Shenzhen Optical Transmission Network Technology Co. Huawei SDH optical transmission equipment, SDH transmission equipment sales phone: 13430988088 Welcome to telephone counseling!
