Cisco Cisco TelePresence MCU 4510 Maintenance Manual
Reservation of MCU media ports
Cisco TelePresence MCU Version 4.2 Printable online help
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MSE Media2 blades the number and type of available media ports on the MCU is controlled by the
port capacity mode which you configure on the
port capacity mode which you configure on the
page.
Unreserved mode
This is the mode that the MCU runs in when the Media port reservation setting is configured as
Disabled, and is the mode that the MCU uses by default. With this scheme, you can specify a
maximum value for the number of video and audio-only ports each conference is allowed to use on the
Conference configuration page. These limits are optional, and by default there is no configured limit.
Disabled, and is the mode that the MCU uses by default. With this scheme, you can specify a
maximum value for the number of video and audio-only ports each conference is allowed to use on the
Conference configuration page. These limits are optional, and by default there is no configured limit.
The configured limits are strictly maximum values; in particular, setting such a limit does not guarantee
that that many participants will be able to join the conference. It is perfectly possible to set these
values such that the sum of the configured limits across all active conferences exceeds the total
number of ports available on the MCU.
that that many participants will be able to join the conference. It is perfectly possible to set these
values such that the sum of the configured limits across all active conferences exceeds the total
number of ports available on the MCU.
Reserved mode
This is the mode that the MCU runs in when the Media port reservation setting is configured as
Enabled. With this scheme, each conference must be configured with a number of video ports to
reserve and a number of audio-only ports to reserve. These values differ from the maximum port
values set in
Enabled. With this scheme, each conference must be configured with a number of video ports to
reserve and a number of audio-only ports to reserve. These values differ from the maximum port
values set in
Reservations are guaranteed
As well as being maximum values (i.e. enforcing limits on the number of conference participants),
port reservation values also guarantee that that many endpoints are able to participate in the
conference.
As well as being maximum values (i.e. enforcing limits on the number of conference participants),
port reservation values also guarantee that that many endpoints are able to participate in the
conference.
Port reservations are mandatory
In unreserved mode, it is not necessary to specify a number of video or audio-only ports for a
conference. In reserved mode, however, every conference must have configured reservations for
both video and audio-only ports.
In unreserved mode, it is not necessary to specify a number of video or audio-only ports for a
conference. In reserved mode, however, every conference must have configured reservations for
both video and audio-only ports.
Over-allocation is not permitted
Port reservations guarantee that a certain number of participants will be able to join a conference;
because of this, the MCU will not permit these reservations to be configured such that the total
number of reserved ports at any given time exceeds the total number of ports available. See
Port reservations guarantee that a certain number of participants will be able to join a conference;
because of this, the MCU will not permit these reservations to be configured such that the total
number of reserved ports at any given time exceeds the total number of ports available. See
Clashing reservations
In order to honor configured port reservations, the MCU must ensure that at any given time the
number of reserved ports does not exceed the total media capacity. This entails some level of clash
detection when you schedule conferences change their configuration.
number of reserved ports does not exceed the total media capacity. This entails some level of clash
detection when you schedule conferences change their configuration.
The MCU considers two conferences to be clashing if they can ever be active simultaneously. When
validating a conference schedule, the MCU looks at the maximum number of ports reserved by other
conferences which can be active at the same time, and checks that the number of ports requested by
the conference being added or changed is guaranteed to be available. If, for instance, the MCU has
20 video ports available in total, it will not be possible to set up two conferences which require 15
video ports each if they are scheduled such that they ever overlap.
validating a conference schedule, the MCU looks at the maximum number of ports reserved by other
conferences which can be active at the same time, and checks that the number of ports requested by
the conference being added or changed is guaranteed to be available. If, for instance, the MCU has
20 video ports available in total, it will not be possible to set up two conferences which require 15
video ports each if they are scheduled such that they ever overlap.
In the simple case of conferences which start at specific times and end at specific times (or, indeed,
are permanent), it is easy to see whether they clash. The more complex cases involve repetition, and
it is important to bear in mind that port reservations are only permitted when the MCU can guarantee
them for
are permanent), it is easy to see whether they clash. The more complex cases involve repetition, and
it is important to bear in mind that port reservations are only permitted when the MCU can guarantee
them for
every
repetition of a conference. As an example, a conference scheduled to run from 08:00 to
10:00 on the second Monday of each month will be deemed to clash with a conference configured to
run from 09:00 to 09:30 every Monday, even though the former will only really clash with the latter
every fourth or fifth week.
run from 09:00 to 09:30 every Monday, even though the former will only really clash with the latter
every fourth or fifth week.
In general, to make best use of the available MCU media ports, you should not schedule conferences
to be longer than needed, and you should limit repetitions, either by end date or number, wherever
possible.
to be longer than needed, and you should limit repetitions, either by end date or number, wherever
possible.