User Manual

Configuring X-Pedition Access Security
396 Enterasys X-Pedition User Reference Manual
In other words, VACM gives the ability to allow or deny access to any individual item of
management information depending on the user's group membership and the level of security
provided by the communications channel.
Reliability
In addition to better security and better access control, SNMPv3 also provides a higher degree of
reliability for notifying management stations when critical events occur.
Traditionally SNMP agents communicated events to SNMP managers via “traps.” However, if a
temporary network problem prevents the reception of the trap by the manager, then the trap is lost.
SNMPv3 provides “informs” which are a more reliable form of traps. The SNMP agent initiates the
inform process by sending an inform request to the manager. The manger responds to the inform
request to acknowledge receipt of the message. If the inform is not received by the manager, the
inform request will timeout and a new inform request will be sent. Subsequent inform requests will
be sent as previous requests time-out until either an acknowledgement is received from the
manager, or until a pre-specified retry-count is reached.
Supported SNMPv3 MIBs
This feature supports the following SNMPv3 MIBs
• RFC 1213 MIB-2
• RFC 1471 PPP LCP (Link Control Protocol)
• RFC 1472 PPP Security Protocol
• RFC 1473 PPP IP NCP (Network Control Protocol)
• RFC 1474 PPP Bridge NCP
• RFC 1493 Definitions of Managed Objects for Bridges
• RFC 1512 FDDI MIB
• RFC 1595 SONET / SDH MIB
• RFC 1643 Ethernet Like Interface MIB
• RFC 1657 BGP4 MIB
• RFC 1695 ATM MIB
• RFC 1724 RIPv2 MIB
• RFC 1742 AppleTalk Management Information Base II
• RFC 1850 OSPF MIB
• RFC 1901 Introduction to Community-based SNMPv2 (SNMPV2c)
• RFC 1907 SNMP v2 MIB