3Com 4007, Руководство по внедрению, Страница: 643 / 684

Remote Monitoring (RMON) 643
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.
Network-Layer Matrix Group
The nlMatrix group gathers statistics about pairs of hosts based on
network-layer address. (The RMON-1 matrix group gathers statistics
based on MAC address.)
This group features two control tables and three data tables. One control
table and its data tables collect matrix statistics; the other control table
and its data table collect TopN statistics (reports describing hosts that top
a list).
Application-Layer Host Group
The alHost group gathers statistics about IP packets over a monitored
port based on their protocol. (The RMON-2 network-layer matrix group
gathers statistics based on the network address).
This group features a host data table.