Extreme Networks EPICenter 4.1, Руководство по установке программного обеспечения, Страница: 406 / 546

406 EPICenter Software Installation and User Guide
Voice over IP Manager
ports. Depending on your VoIP network topology and device configuration, there may be situations
where the minimum bandwidth is either overestimated or underestimated. See “Minimum
Bandwidth Calculations” on page 402” for more details. If this occurs, you can edit the bandwidth
parameters as part of this configuration process.
The VoIP applet also sets the QoS profile and priority in the Calculated Settings list based on the
settings you select in the fields in the Select Switches area of the window.
To configure one or more switches with settings that differs from the default settings, do the
following:
2 Make your changes to the QoS settings:
a Select the QoS profile that should be used (QP1 through QP8).
b Select the priority (low to highHi).
c Select the compression algorithm.
d Type in a compression rate to be used as a parameter in the calculation of minimum bandwidth.
The default is the rate normally used by the compression algorithm. If you have selected “Other”
as the compression algorithm, the default is set to zero. This value is used only in the calculation
of minimum bandwidth, and does not affect the actual compression rate used by the phone. As a
rule, you should set the compression rate to be the same as the rate actually used by the
compression algorithm for the phone.
3 Select one or more switches that should be configured using these QoS settings, and click the Add
button to move them to the Calculated Settings list.
Click the Add All button to move the entire list of switches to the Calculated Settings list.
4 You can edit the minimum and maximum bandwidth setting values once an entry has been placed
in the Calculated Settings list. Select the cell containing the bandwidth percentage you want to
change, type in a new percentage, and click outside the cell for the change to be recognized.
There are a number of reasons why you might want to change the minimum or maximum
bandwidth settings:
— To reduce the minimum bandwidth percentage when the IP phone ports are set to Auto but
actually run at 1000 Mbps
— To increase the minimum bandwidth percentage when a ingress port is actually a trunk port
carrying aggregated VoIP traffic from an edge switch
—
To limit the maximum bandwidth (the default maximum is 100%)
See “Minimum Bandwidth Calculations” on page 402 for more details on the bandwidth calculation
issues.
5 You can repeat steps one and two for other switches in the Select Device(s) list.
6 To change the profile, priority, algorithm or compression rate for an entry in the Calculated Settings
list, you must remove the switch from the list, change the settings, and add it again.
Remove switches from the Calculated Settings list by
selecting the switches and clicking the Remove button
.
You can remove all switches from the Calculated
Settings list by clicking the Remove All button
.
7
Click the Apply button to initiate configuration of the QoS parameters on the switches.