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Inband DCN loop in RTN980 cause the management down

Publication Date:  2019-07-09 Views:  165 Downloads:  0

Issue Description

In X project, we have 4 RTN 980 all of them are GNE connected to the E1converter  according  to customer requirements and working normally and after while days we connected 1 fiber and 2 Ethernet cables to pass the traffic of the beyond this RTN so all the GNE are down management expect the one who connected to the E1 converter after analysis we found that there is loop in Band DCN and here is the below our network DCN

Alarm Information


Handling Process

1-access on the configuration/communication parameters /DCC management /
2-Disable DCC channel ,D1-D3 and ensure that the communication Status receiving failed

3-for the EG2D inband DCN-
     -access on the configuration/communication parameters /DCN management /port setting/FE,GE,-ensure that staus disable

Root Cause

1-After analysis there SL4D contain D1-D3 default value and D1-D12 default value
2-EG2D support also inband DCN with default value  VLAN: 1 to 4094,  default value of 4094
Bandwidth: 64 kbit/s to 1 Mbit/s, with the default value of 512 kbit/s
3-check the ehernet cable by tester


1-The inband DCN refers to the communication mode in which the DCN is built by the service channels provided by the managed equipment. .so make sure that if you need not to use make sure to disable the function
2- after all this procedure the NGE return up again through the E1 converter so you have to ensure that DCC transparent channel disable to avoid in loop