User`s guide

Components of the Network Model
4-6
8000-A2-GB21-10
June 1997
In other words, the router’s interface to the MCC must be multihomed. This is
necessary to support proxy ARP.
Discovering Devices on the Network (Discovery)
In the illustration on page 4-5, the IP addresses assigned for the router’s
interface to the MCC card are 135.1.2.1 and 135.1.3.254. The second IP address
is on the same subnetwork as the internal addresses of the DSL cards and the
HotWire 5446 RTUs. The MCC card will not forward broadcasts on the
management network (135.1.2.x) across the HotWire DSLAM system backplane
because it is a separate subnetwork, as the DSL cards do not need to be
discovered by the management system.
How does the NMS learn the address of a device beyond the MCC card?
 DCE Manager gets the IP address of a DSL card from the Entity MIB on the
MCC card.
After the DCE Manager has learned the IP address of a DSL card through
the Entity MIB, it addresses management traffic directly to that card.
 DCE Manager gets IP address of the RTU from the Entity MIB on the DSL
card.
After the DCE Manager has learned the IP address of the RTU through the
Entity MIB, it addresses management traffic directly to that RTU.
When the HotWire DSLAM and HotWire 5446 systems networks are configured
as described above, the DCE Manager provides a view of the entire network from
information contained in the MCC card’s entity MIB.
97-1549
2
MCC Card
DSL Card 1
DSL Card 2
RTU RTU RTU RTU RTU RTU
NOTE:
It is not recommended that the DCE Manager access a DSL card via its
Ethernet port because the Entity MIB on the DSL card does not reflect a view
of the entire HotWire DSLAM system. It reflects only the view of the DSL card
discovered . Also, in a fully configured DSLAM, 18 additional devices will be
discovered and appear on your network map.
If you want to manage DSL devices across the ISP network, use telnet. For
more information on telnet see Chapter 8,
Diagnostics and Troubleshooting ,
of the
HotWire Digital Subscriber Line Access Multiplexer (DSLAM) User’s
Guide
.