TCP IP Illustrated

00xcinternettransport the systems object identifier

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Unformatted text preview: node. file:///D|/Documents%20and%20Settings/bigini/Doc...omenet2run/tcpip/tcp-ip-illustrated/snmp_sim.htm (13 of 33) [12/09/2001 14.47.40] Chapter 25. SNMP: Simple Network Management Protocol Value indicating services provided by node. It is the sum of the layers in the OSI model supported by the node. The following values are added together, depending on the services provided: 0x01 (physical) , 0x02 (datalink), 0x04 (internet), 0x08 (end-to-end), 0x40 (application). sysServices [0..127] Figure 25.16 Simple variables in system group. We can query the router netb for some of these variables: sun % snmpi -a netb -c secret snmpi> get sysDescr.0 sysObjectID.0 sysDpTime.0 sysServices.0 sysDescr.0="Epilogue Technology SNMP agent for Telebit NetBlazer" sysObjectID.0=1.3.6.1.4.1.12.42.3.1 sysUpTime.0=22 days, 11 hours, 23 minutes, 2 seconds (194178200 timeticks) sysServices.0=0xc<internet,transport> The system's object identifier is in the internet.private.enterprises group (1.3.6.1.4.1) from Figure 25.6. From the Assigned Numbers RFC we can determine that the next object identifier (12) is assigned to the vendor (Epilogue). We can also see that the sysServices variable is the sum of 4 and 8: this element supports the Internet layer (i.e., routing) and the transport layer (i.e., end-to-end). interface Group Only one simple variable is defined for this group: the number of interfaces on the system, shown in Figure 25.17. Name ifNumber Datatype R/W INTEGER Description Number of network interfaces on system. Figure 25.17 Simple variable in if group. This group also defines a table with 22 columns. Each row of the table defines the characteristics for each interface, as shown in Figure 25.18. Interface table, index = < IfIndex > Name ifIndex Datatype INTEGER R/W Description Index of interface, between one and if Number. file:///D|/Documents%20and%20Settings/bigini/Doc...omenet2run/tcpip/tcp-ip-illustrated/snmp_sim.htm (14 of 33) [12/09/2001 14.47.40] Chapter 2...
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