Description of the problem

OSN3500 is upgraded from version R7 to R8 and above, and the DCC_CHAN_LACK alarm is reported after the network element is upgraded, accompanied by the network element going offline.

Processing

See Problem Causes and Solutions.

Root cause

Since the number of D1-D3 channels enabled on the network element before the upgrade is more than 40 due to the SSN1GSCC master DCC assignment working mode 1. this DCC_CHAN_LACK alarm of the R7 code is not registered, so the alarm is not reported before the upgrade. The upgraded version registers the alarm, so it is reported. Because the order of resource allocation after the upgrade is according to the time when the veneer comes online, the DCC ports used for communication between the network management and the network elements may not get the resources, which may lead to the network elements being de-registered.

The technical information related to this chapter and the SDH equipment troubleshooting process are collected and organized by Shenzhen Optical Transmission Network Technology Co. ( www.opticaltrans.com), and are reproduced and retained! Our company specializes in the sale of Huawei SDH optical transmission equipment, SDH transmission equipment.