TCP IP Illustrated

Since the response to the get next operator contains

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Unformatted text preview: g the next variable, in column-row order: sun % snmpi-a gateway -c secret snmpi> next udpTable udpLocalAddress.0.0.0.0.67=0.0.0.0 snmpi> next udpLocalAddress.0.0.0.0.67 udpLocalAddress.0.0.0.0.161-0.0.0.0 snmpi> next udpLocalAddress.0.0.0.0.161 udpLocalAddress.0.0.0.0.52 0=0.0.0.0 file:///D|/Documents%20and%20Settings/bigini/Doc...omenet2run/tcpip/tcp-ip-illustrated/snmp_sim.htm (12 of 33) [12/09/2001 14.47.40] Chapter 25. SNMP: Simple Network Management Protocol snmpi> next udpLocalAddress.0.0.0.0.520 udpLocalPort.0.0.0.0.67=67 snmpi> next udpLocalPort.0.0.0.0.67 udpLocalPort.0.0.0.0.161=161 snmpi> next udpLocalPort.0.0.0.0.161 udpLocalPort.0.0.0.0.520=520 snmpi> next udpLocalPort.0.0.0.0.520 snmpInPkts.0=59 we're finished with the UDP listener table We see that the order returned corresponds to Figure 25.14. How does a manager know when it reaches the end of a table? Since the response to the get-next operator contains the name of the next entry in the MIB after the table, the manager can tell when the name changes. In our example the last entry in the UDP listener table is followed by the variable snmpInPkts. 25.8 Management Information Base (Continued) We now return to the description of the MIB. We describe only the following groups: system (system identification), if (interfaces) , at (address translation), ip, icmp, and tcp. Additional groups are defined. system Group The system group is simple; it consists of seven simple variables (i.e., no tables). Figure 25.16 shows their names, data types, and descriptions. Name sysDescr Datatype R/W Display String sysObjectID ObjectID Description Textual description of entity. Vendor's ID within the subtree 1.3.6.1.4.1. sysUpTime TimeTicks Time in hundredths of a second since network management portion of system was rebooted. sysContact DisplayString * Name of contact person and how to contact them. sysName DisplayString * Node's fully qualified domain name (FQDN). sysLocation DisplayString * Physical location of...
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