User Manual

Additional Remote Networking Bandwidth On Demand
5-7
5.3.3.2 Assign Port Priority Numbers
Priority numbers enable a site to determine which of its assigned ports it should use first for outgoing calls.
The highest priority ports, those with higher priority numbers, will be used first. As additional bandwidth
is needed, lower priority ports will be used in descending order of priority.
To assign priority numbers to a site’s ports, use the following command:
Figure 5-9: Assigning Port Priority Numbers
Note: By default, all ports are assigned a priority of 1.
5.3.3.3 Specify the Bandwidth Measurement Period
A period must be specified (in seconds) during which the SCS will measure a site’s use of bandwidth. The
measurement taken during this period will be compared to the Add and Remove values (see below) to
determine if bandwidth should be added or removed. Short periods may lead to “thrashing.”
Figure 5-10: Specifying the Bandwidth Measurement Period
5.3.3.4 Specify When Bandwidth is Added or Removed
Determine when bandwidth will be added or removed from a site. This is specified in terms of a percentage;
when a site’s bandwidth use on its currently-dialed out ports reaches or falls below this percentage,
bandwidth will be added or removed as appropriate.
Figure 5-11: Determining When Bandwidth Will Be Added/Removed
5.3.3.5 Configure the Delay Between Bandwidth Adjustments
Determine the minimum period of time between one adjustment in bandwidth (addition or removal) and a
following adjustment. Configure this delay using the Define Site Bandwidth Holddown command; by
default, this timer is set to 60 seconds.
Figure 5-12: Configuring the Holddown Timer
The holddown timer helps to limit the "thrashing" caused by rapid adjustments in bandwidth. When the
holddown timer is used in conjunction with a short bandwidth measurement period, the site will respond
quickly to initial changes in packet traffic without thrashing.
In the example above, the holddown timer is set to 30 seconds. When bandwidth is added to site irvine,
additional bandwidth cannot be added until 30 seconds have passed. Bandwidth changes in the opposite
direction (addition or subtraction) require a delay of double the holddown timer; for example, when
bandwidth is removed from irvine, it cannot be added for 60 seconds.
Local>> DEFINE SITE irvine PORT 2 PRIORITY 2
Local>> DEFINE SITE irvine BANDWIDTH PERIOD 60
Local>> DEFINE SITE irvine BANDWIDTH ADD 90
Local>> DEFINE SITE irvine BANDWIDTH REMOVE 40
Local>> DEFINE SITE irvine BANDWIDTH HOLDDOWN 30