3Com CoreBuilder 3500, Implementation Manual

Page: 554 / 592

554 C
HAPTER
18: D
EVICE
M
ONITORING
Protocol Distribution Group
The protocolDist group tracks how many octets and packets the
supported protocols have sent. It features two tables, a protocol
distribution control table that manages the collection of the statistics for
the supported protocols, and a protocol distribution statistics table that
records the statistics. In the control table, each row represents a network
interface associated with the probe and controls rows in the statistics
table (a row for each protocol associated with the interface).
The protocolDist tables keep statistics for the three base protocols: IP, IPX,
and AppleTalk. Unlike the protocolDir group, it does not keep statistics
for higher-level protocols such as UDP, TCP, UDP-SNMP, and so forth.
The protocol distribution statistics table includes the following statistics:
■
The number of packets received for each protocol
■
The number of octets transmitted to this address since it was added to
the network-layer host table
Address Map Group
The addressMap group maps each network address to a specific
MAC-level address and to a specific port on the network device. This
group provides three scalar objects (to track address-mapping entry
insertions, deletions, and the maximum number of entries), an address
map control table, and an address map data table.
Unlike other RMON control tables and data tables, the address map data
table is not indexed by a row of the control table. The data table has
entries that enable the mapping between the network addresses
(normally IP addresses) and MAC addresses. The control table has an
entry for each subnetwork connected to the probe so that addresses can
be discovered on a new subnetwork and address mapping entries can be
placed in the data table.
Network-Layer Host Group
The nlHost group gathers statistics about packets based on their
network-layer address. (The RMON-1 host group gathers statistics based
on MAC address.)
This group features a host control table and a host data table.