The value of pwTemplateIgmpMcacPrRsvMndBW specifies the bandwidth
pre-reserved for all the mandatory channels on a given interface
in kilo-bits per second(kbps).
If the value of pwTemplateIgmpMcacUnconstBW is '0', no mandatory
channels are allowed. If the value of pwTemplateIgmpMcacUnconstBW
is '-1', then all mandatory and optional channels are allowed.
If the value of pwTemplateIgmpMcacPrRsvMndBW is equal to the
value of pwTemplateIgmpMcacUnconstBW, then all the unconstrained
bandwidth on a given interface is allocated to mandatory channels
configured through multicast CAC policy on that interface and no
optional groups (channels) are allowed.
The value of pwTemplateIgmpMcacPrRsvMndBW should always be less
than or equal to that of pwTemplateIgmpMcacUnconstBW. An attempt
to set the value of pwTemplateIgmpMcacPrRsvMndBW greater than
that of pwTemplateIgmpMcacUnconstBW will result in
'inconsistentValue' error.