1. SNMP Management Information
Prof. Choong Seon HONG

2. MIB-II RFC 1213 : superset of MIB-I <---- RFC 1156 (MIB-I)
Design criteria of MIB-II as newer version
object for fault or configuration management
weak control objects : not secure
including current use and utility
not limited number of objects (100 objects in MIB-I), all objects
avoiding redundant variables
excluding implementation-specific objects (for example, for BSD UNIX)

3. MIB-II (cont’d) MIB-2 group (refer Figure 5.1) system interfaces at ip
icmp
tcp
udp
egp
dot3
snmp

4. system Group
providing general information about the managed system (see fig 6.1, table 6.1)
having a value that is interpreted as a seven-bit code
sysServices =  2 L-1 Where S = set of number of layers for which services
LS are Provided
For example, or 72 (2 (4-1) + 2 (7-1)) for host that provides application services
sysDescr
systObjectID
sysUpTime : timeTicks
sysContact : contact point
sysNames : administratively assigned name
sysLocation : Physical location
sysServices : a value that indicates the set of services this entity primarily offers

5. System Group

6. interfaces Group
containing generic information about the physical interfaces
configuration information and statistics on the events occurring at each interface
mandatory implementation for all systems
containing basic information that is useful as a starting point for any network management function
See Table 6.2 and Figure 6.2
ifType : recording the type of interface (See Table 6.3)
ifOperStatus : reflecting actual current operational status (read-only)
ifAdminStatus : enabling a manager to specify a desired operational status (read-write)
ex) if ifAdminStatus is value up(1), while ifOperStatus is value down(2) then interface has failed

7. interfaces Group
Figure 6.2

8. interfaces Group

9. MIB-II
visualizing the flow of traffic across an interface using Case diagram (see Figure 6.3)
ifOutDiscards

10. MIB-II Address translation Group
providing mapping from a network address (IP address) to a physical address (ex, MAC address, X.121 address)
deprecated in MIB-II

11. MIB-II
ip Group
including information relevant to the implementation and operation of IP at a node
containing some basic counters of traffic flow into and out of the IP layer
See Fig 6.5, Table 6.5

12. MIB-II
ip Group

13. MIB-II (cont’d) ipRouteProto other local netmgmt icmp egp
ggp (obsolete)
hello (obsolete)
rip
is-is
es-is
ciscoIgrp
bbnSpfIgp
ospf
bgp

14. MIB-II (cont’d)

15. MIB-II (cont’d)
ipRouteType
other
invalid
direct
indirect

16. MIB-II (cont’d)
IP Forwarding table
: replacing ipRouteTable

17. icmp Group
Transferring messages from routers and other hosts to a host
providing feedback about problems in the communications environment , ex) not reaching datagram, buffering capacity problem to forward a datagram
Containing information relevant to the implementation and operation of ICMP at a node (See Figure 6.8, Table 6.6)

18. icmp Group

19. icmp Group

20. icmp Group

21. icmp Group

22. tcp Group
Containing information relevant to the implementation and operation of TCP at a node (Figure 6.10, Table 6.7)
The only table that is part of this group : tcpConnTable
tcpRtoAlgorithm : after transmitting a segment, related to receiving an acknowledgement
determining the amount of time that a sending TCP entity waits before retransmitting
other, constant, rsre, vanj

23. tcp Group

24. tcp Group
Case diagram for MIB-II tcp group

25. udp Group
Containing information relevant to the implementation and operation of UDP at a node (Figure 6.12, Table 6.8)
udpTable : containing information about this entity’s UDP end-points on which a local application is currently accepting datagrams
IP address
UDP port

26. udp Group
Case diagram for MIB-II udp group

27. udp Group

28. egp Group
Containing information relevant to the implementation and operation of the External Gateway Protocol (EGP) at a node (See Figure 6.14, Table 6.9)
egpNeighTable : containing information about each of the neighbor gateways known to this entity

29. egp Group

30. Transmission Group
Containing objects that provides details about the underlying transmission medium for each interface on a system
A node in the MIB-II hierarchy under which various interface-specific groups are located

31. Ethernet Interface MIB
An MIB defined under the transmission node of MIB-II hierarchy
Object Structure of EtherLike MIB (See Figure 6.15, Table 6.10)

32. Ethernet Interface MIB

33. Ethernet Interface MIB