The nodes in the BMS are not stable, from time to time it goes down and it appears in the Map as its deactivating ones
These sites ware connected to BMS as follows:
MSAN (PVM configured working in integrated mode with IPM)==> S9306A ==> S9306A ==>BMS
all the links between BMS and sites were ok but sometimes we can ping and sometimes we can not.
After checking the SFP types, we found that most of the SFPs used was with following specifications .
Transmission rate 1.25 Gbit/s; Central wavelength 1310 nm; Maximum reach 10 km or 40 km (in the S9300 side).
Transmission rate 1.25 Gbit/s; Central wavelength 1310 nm; Maximum reach 40 km (in the MSAN side).
So for some links were used SFP with Maximum reach 40 km from one side and Maximum reach 10 km from the other side.
After using the SFP for each link with completely the same specification even though the Maximum reach parameter, the problem solved.
1.The situation were ok before adding about 5 new sites
2.Checking the link between the MSAN and BMS, all the links between BMS and sites were ok but sometimes we can ping and sometimes we can not.
3.Checking the configuration of the SNMP in the MSAN sites, it was configured.
4.The configuration in the two Switches were ok