TCP IP Illustrated

This is a simple group with only a few variables and

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Unformatted text preview: b object identifiers in Figure 25.6 we also show one named iso.org.dod.internet.private.enterprises (1.3.6.1.4.1). "This is where vendorspecific MIBs are located. The Assigned Numbers RFC lists around 400 identifiers registered below this node. 25.5 Introduction to the Management Information Base file:///D|/Documents%20and%20Settings/bigini/Docu...homenet2run/tcpip/tcp-ip-illustrated/snmp_sim.htm (6 of 33) [12/09/2001 14.47.40] Chapter 25. SNMP: Simple Network Management Protocol The Management Information Base, or MIB, is the database of information maintained by the agent that the manager can query or set. We describe what's called MIB-II, specified in RFC 1213 [McCloghrie and Rose 1991]. As shown in Figure 25.6, the MIB is divided into groups named system, interfaces, at (address translation), ip, and so on. In this section we describe only the variables in the UDP group. This is a simple group with only a few variables and a single table. In the next sections we use this group to show the details of instance identification, lexicographic ordering, and some simple examples of these features. After these examples we return to the MIB in Section 25.8 and describe some of the other groups in the MIB. In Figure 25.6 we showed the group named udp beneath mib. Figure 25.7 shows the structure of the UDP group. Figure 25.7 Tree structure of IP address table. There are four simple variables and a table containing two simple variables. Figure 25.8 describes the four simple variables. Name Datatype R/W Description udpInDatagrams Counter Number of UDP datagrams delivered to user processes. udpNoPorts Counter Number of received UDP datagrams for which no application process was at the destination port. Counter Number of undeliverable UDP datagrams for reasons other than no application at destination port (e.g., UDP checksum error). udpInErrors udpOutDatagrams Counter Number of UDP datagrams sent. file:///D|/Documents%20and%20Settings/bigini/Docu...homenet2run/tcpip/tcp-ip-illustrated/snmp_sim.htm (7 of 33) [12/09/2001 14.47....
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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.

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