Lucent Technologies 6000 - Manual (Page 181)

Configuring Individual WAN Connections
Configuring MP, MP+ and BACP connections
MAX 6000/3000 Network Configuration Guide 4-49
Target utilization
Target Util specifies a percentage of line utilization (default 70%) to use as a threshold when
determining when to add or subtract bandwidth.
Adding or dropping links (Add Pers, Sub Pers, Inc Ch Count, Dec Ch Count)
Add Pers specifies a number of seconds that the ALU must persist beyond the Target Util
threshold before the MAX unit adds bandwidth. Sub Pers specifies a number of seconds that
the ALU must persist below the Target Util threshold before the unit subtracts bandwidth.
When adding bandwidth, the unit adds the number of channels specified in the Inc Ch Count
parameter. When subtracting bandwidth, it subtracts the number of channels specified in the
Dec Ch Count parameter, dropping the newest channels first.
Guidelines for configuring bandwidth criteria
When configuring DBA, keep the following guidelines in mind:
• The values for the Sec History, Add Pers, and Sub Pers parameters should smooth out
spikes in bandwidth utilization that last for a shorter time than it takes to add capacity.
Over T1 lines, the unit can add bandwidth in less than ten seconds. Over ISDN lines, the
unit can add bandwidth in less than five seconds.
• When the unit adds bandwidth, you typically incur a minimum usage charge. Thereafter,
billing is time sensitive. The Sub Pers value should at least allow the period to which the
minimum duration charge applies, plus one or two billing time increments. Typically,
billing is done to the next multiple of six seconds, with a minimum charge for the first
thirty seconds. Your carrier representative can help you understand the billing structure for
the switched tariffs.
• You can add channels one at a time or in multiples. (For additional information, see the
Parallel Dial parameter in the MAX Reference).
• Avoid adding or subtracting channels too quickly (less than 10-20 seconds apart) to reduce
the number of short duration calls, each of which incurs the carrier's minimum charge.
Adding or subtracting channels too quickly can also affect link efficiency, because the
devices on either end have to retransmit data when the link speed changes.
Settings in a RADIUS profile
RADIUS uses the following attribute-value pairs for MP connections:
Attribute Value
Framed-Protocol (7) Encapsulation protocol. MP (262) indicates Multilink Protocol.
Ascend-Base-Channel-C
ount (172) Base number of channels to use for a multilink PPP connection.
When a call is received, the MAX authenticates the first (base)
channels of the call and then determines the maximum and
minimum settings.
Ascend-Minimum-Chann
els (173) Minimum number of channels available to a multilink PPP
connection. In this release, MP does not make use of this value.
However, it’s value can apply to MP+ connections.