AIM2-A2-GZ40-20
May 2005
17
DHCP Option 82
Default: Disabled
NOTE: DHCP Option 82 is available for configuration in NMS only; it cannot be
configured via the CLI or SNMP.
Dynamic Host Configuration Protocol (DHCP) Option 82 allows dynamic
configuration of IP addresses by adding an identifying string to packets (Option 82)
that enables your DHCP Server to recognize which BLC port an IP address
request is coming from. This allows the DHCP Server to limit the number of IP
addresses assigned per port according to the DHCP Server configurations.
PVC Settings
ADSL data travels by way of Asynchronous Transfer Mode (ATM) cells across
Permanent Virtual Circuits (PVCs). Each PVC consists of one Virtual Channel
across one Virtual Path as identified by a Virtual Channel Identifier (VCI) and a
Virtual Path Identifier (VPI). Configuration of PVCs allows for the categorization of
traffic by type (such as video or voice) by assigning a separate PVC to each
Ethernet port (up to four) on a remote modem.
To configure PVC Indexes, you must first deactivate the VPI/VCI Detect parameter
(see
VPI/VCI Detect
, below). The default is ON, whereby the selected port will
automatically monitor the line to determine the VPI and VCI settings of the remote
ADSL modem to which it is connected and set itself accordingly on PVC 1. If no
ATM cells are detected (at any VPI/VCI setting), the port will default to VPI 0 and
VCI 35. Thereafter, once it does detect ATM cells from the remote ADSL modem, it
will reconfigure VPI and VCI to the same settings at which the ATM cells from the
remote ADSL modem were detected. With the VPI/VCI Detect Setting at off, the
selected port will default to VPI 0 and VCI 35 on PVC 1 unless the port was
previously set at VPI/VCI Detect on and had already detected the VPI and VCI
settings of the remote ADSL modem. In this case, turning the VPI/VCI function off
will lock in the previously detected settings unless the VPI and VCI values are
altered manually.
Once the VPI/VCI Detect Setting has been turned off, you will be able to manually
configure the VPI and VCI settings for up to four PVC Indexes (numbered 1–4) in
the same ADSL Circuit Configuration window. Each index must be assigned the
same VPI and VCI values as the port on the remote ADSL modem to which that
index will be assigned in order for traffic to traverse the line successfully. The
pull-down PVC Index menus may now be used to select a PVC Index for each of
the rules you configure.
NOTE: PVC Indexes will only be applied to packets coming in through a subscriber
connection (WAN). They are not applicable to packets coming in through an uplink
connection.
VPI/VCI Detect
Default: On
ADSL data travels by way of Asynchronous Transfer Mode (ATM) cells across
Permanent Virtual Circuits (PVCs). Each PVC consists of one Virtual Channel
across one Virtual Path as identified by a Virtual Channel Identifier (VCI) and a
