Since SNMP is a network management protocol in the TCP/IP protocols, IP routes must be available between an SNMP server and connected NEs. The DCN between OptiX RTN 950A NEs must be an IP DCN. Otherwise, the SNMP server can access information only on the gateway NE.
An SNMP server can communicate with an OptiX RTN 950A NE only when the community names configured on them are the same. A community name is a character string consisting of less than or equal to 16 bytes. It is the password between the management process and the agent process and restricts an SNMP server's operation permission on an OptiX RTN 950A NE.
The operation permission corresponding to a community name can be read or write.
SNMP server with the read permission can perform the Get, Get-Next, and GetBulk permissions
SNMP server with the write permission can perform the Set operations.
Troubleshooting case: SNMP test failed
When a SNMP is access through the NMS port, the NMS port is connected to the management domain, but the DCN management mode we found was service domain.
As a result, the SNMP packet port is unreachable.
So, please make sure that DCN is used as Management Domain when SNMP is used through NMS port. 
