Configuring the System Description on a Device Running JUNOS Software
You can specify a description for each system being managed by SNMP. This string is placed into the MIB II sysDescription object. To configure a description, include the description statement at the [edit snmp] hierarchy level:
[edit snmp]description description;
If the description contains spaces, enclose it in quotation marks (" ").
To specify the system description:
[edit]snmp {description "M40 router with 8 FPCs";}