3Com CoreBuilder 3500, Implementation Manual

Page: 564 / 592

564 C
HAPTER
18: D
EVICE
M
ONITORING
RMON-2 MIB RMON-1 and RMON-2 are complementary MIBs. The RMON-2 MIB
extends the capability of the original RMON-1 MIB to include protocols
above the MAC level. Because network-layer protocols (such as IP) are
included, a probe can monitor traffic through routers attached to the
local subnetwork.
Use RMON-2 data to identify traffic patterns and slow applications. The
RMON-2 probe can monitor:
■
The sources of traffic arriving by a router from another network.
■
The destination of traffic leaving by a router to another network.
Because it includes higher-layer protocols (such as those at the application
level), an RMON-2 probe can provide a detailed breakdown of traffic by
application.
Table 70 shows the additional MIB groups available with RMON-2.
Table 70 RMON-2 Group Descriptions
RMON-2 Group Description
Protocol Directory(11) Lists the inventory of protocols that the probe can
monitor
Protocol Distribution(12) Collects the number of octets and packets for
protocols detected on a network segment
Address Map(13) Lists MAC-address-to-network-address bindings
discovered by the probe, and the interface on which
the bindings were last seen
Network Layer Host(14) Counts the amount of traffic sent from and to each
network address discovered by the probe
Network Layer Matrix(15) Counts the amount of traffic sent between each pair
of network addresses discovered by the probe
Application Layer Host(16) Counts the amount of traffic, by protocol, sent from
and to each network address discovered by the
probe
Application Layer Matrix(17) Counts the amount of traffic, by protocol, sent
between each pair of network addresses discovered
by the probe
User History(18) Periodically samples user-specified variables and logs
the data based on user-defined parameters
Probe Configuration(19) Defines standard configuration parameters for
RMON probes