User's Manual

Table Of Contents
174 Operation
Chapter 4 - Operation and Administration
with "AA AA 03" in the header, and the destination MAC address is
00:10:E7:00:00:01. If the SU receives this packet from the Ethernet, it
means that there is a loop and the SU will send an appropriate message
to the NPU.
2 Duplicate SU Name: The SU Name (User Name) is already in use by
another SU connected to the same Base Station. A Base Station cannot
serve two SUs with the same User Name. Upon identifying an SU with
an SU Name (User Name) that is identical to that of a previously
registered SU, the new SU will be registered (to enable management),
but will not receive any services. Its name in the NPU database will be
changed to SU@<SU's MAC Address>. The system administrator will be
informed of the problem through the Fault Status parameter in any of
the relevant Show menus (Fault Status 2) and through a trap message
(rbSuDuplicateName trap). If the administrator decides that the SU is
legitimate and should receive services, a new User Name must be
configured in the SU. The SU will receive services only after configuring
it with a User Name that is unique in the Base Station’s database. (see
also Section 4.10.7.3.1.1).
Summary Information
Total Number of SUs: The total number of SUs in the database (including
connected and pre-configured SUs)
Total Connected SUs
SUs Connected to AU Slot N, where N=1-4, 7-9.
NOTE
Another loop avoidance mechanism that is transparent to the operator is performed by the NPU:
The NPU scans packets received from the network (DATA port) and verifies that the SRC MAC in
the received packet does not match any of the addresses in the NPU's bridging table. If there is a
match it means that the source MAC address of the message received from the network side is
identical to a MAC address of a device behind one of the SUs served by the Base Station. In case
of a match, the NPU discards all packets designated to the device with this MAC address, until it's
aging time expires.
NOTE
An SU that is defined as Temporary will be deleted from the database 20 minutes after being
disconnected.