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Unformatted text preview: tely the details of ASN.1 and BER are only important to implementors of SNMP. They are
not fundamental to the understanding and use of network management. file:///D|/Documents%20and%20Settings/bigini/Doc...omenet2run/tcpip/tcp-ip-illustrated/snmp_sim.htm (31 of 33) [12/09/2001 14.47.40] Chapter 25. SNMP: Simple Network Management Protocol 25.12 SNMP Version 2
During 1993 11 RFCs were published defining revisions to SNMP The first of these, RFC 1441
[Case et al. 1993], provides an introduction to SNMP Version 2 (SNMPv2). Two books also
describe SNMPv2 [Stallings 1993; Rose 1994]. Two publicly available implementations already
exist (see Appendix B.3 of [Rose 1994]), but vendor implementations probably won't be widely
available until 1994.
In this section we describe the major differences from SNMPv1 to SNMPv2.
1. A new packet type get-bulk-request allows the manager to retrieve large blocks of
2. Another new packet type inform-request allows one manager to send information to
3. Two new MIBs are defined: the SNMPv2 MIB and the SNMPv2-M2M MIB (Manager-toManager).
4. SNMPv2 provides security enhancements over SNMPv1. In SNMPv1 the community name
passed from the manager to the agent is a cleartext password. SNMPv2 can provide
authentication and privacy.
As vendors start to provide SNMPv2-capable agents, management stations will also appear that can
handle both. [Routhier 1993] describes extending an implementation of SNMPv1 to support
SNMPv2. 25.13 Summary
SNMP is a simple request-reply protocol between an SNMP manager and an SNMP agent. The
management information base (MIB) defines the variables that are maintained by the agent, for the
manager to query or set. Only a limited number of data types are used to define these variables.
All the variables are identified by object identifiers, a hierarchical naming scheme consisting of
long strings of numbers that are normally abbreviated into a simple name, for human readability. A
specific instance of a variable is identified by appending an instance to the object identifier.
Many SNMP variables are contained in tab...
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This test prep was uploaded on 04/04/2014 for the course ECE EL5373 taught by Professor Guoyang during the Spring '12 term at NYU Poly.
- Spring '12