46Simple Network Management Protocol(SNMP)The Simple Network Management Protocol (SNMP) is designed to manage devices on IP networks bymonitoring device operation, which might require administrator intervention.NOTE: On Dell Networking routers, standard and private SNMP management information bases(MIBs) are supported, including all Get and a limited number of Set operations (such as set vlanand copy cmd).Protocol OverviewNetwork management stations use SNMP to retrieve or alter management data from network elements.A datum of management information is called a managed object; the value of a managed object can bestatic or variable. Network elements store managed objects in a database called a managementinformation base (MIB).MIBs are hierarchically structured and use object identifiers to address managed objects, but managedobjects also have a textual name called an object descriptor.Implementation InformationThe following describes SNMP implementation information.• Dell Networking OS supports SNMP version 1 as defined by RFC 1155, 1157, and 1212, SNMP version 2cas defined by RFC 1901, and SNMP version 3 as defined by RFC 2571.• Dell Networking OS supports up to 16 trap receivers.• Dell Networking OS implementation of the sFlow MIB supports sFlow configuration via SNMP sets.• SNMP traps for the spanning tree protocol (STP) and multiple spanning tree protocol (MSTP) statechanges are based on BRIDGE MIB (RFC 1483) for STP and IEEE 802.1 draft ruzin-mstp-mib-02 forMSTP.SNMPv3 Compliance With FIPSSNMPv3 is compliant with the Federal information processing standard (FIPS) cryptography standard. TheAdvanced Encryption Standard (AES) Cipher Feedback (CFB) 128-bit encryption algorithm is incompliance with RFC 3826. SNMPv3 provides multiple authentication and privacy options for userconfiguration. A subset of these options are the FIPS-approved algorithms: HMAC-SHA1-96 forauthentication and AES128-CFB for privacy. The other options are not FIPS-approved algorithms becauseof known security weaknesses. The AES128-CFB privacy option is supported and is compliant with RFC3826.838 Simple Network Management Protocol (SNMP)
