Cisco Cisco TelePresence Video Communication Server Expressway 관리 매뉴얼
Use subzone bandwidth limits if you want to configure the bandwidth available between one specific subzone and all
other subzones or zones.
other subzones or zones.
Use pipes if you want to configure the bandwidth available between one specific subzone and another specific
subzone or zone.
subzone or zone.
If your bandwidth configuration is such that multiple types of bandwidth restrictions are placed on a call (for example,
if there are subzone bandwidth limits and pipe limits), the lowest limit will always apply to that call.
if there are subzone bandwidth limits and pipe limits), the lowest limit will always apply to that call.
How different bandwidth limitations are managed
In situations where there are differing bandwidth limitations applied to the same link, the lower limit will always be the
one used when routing the call and taking bandwidth limitations into account.
one used when routing the call and taking bandwidth limitations into account.
For example, Subzone A may have a per call inter bandwidth of 128. This means that any calls between Subzone A
and any other subzone or zone will be limited to 128kbps. However, Subzone A also has a link configured between it
and Subzone B. This link uses a pipe with a limit of 512kbps. In this situation, the lower limit of 128kbps will apply to
calls between the two, regardless of the larger capacity of the pipe.
and any other subzone or zone will be limited to 128kbps. However, Subzone A also has a link configured between it
and Subzone B. This link uses a pipe with a limit of 512kbps. In this situation, the lower limit of 128kbps will apply to
calls between the two, regardless of the larger capacity of the pipe.
In the reverse situation, where Subzone A has a per call inter bandwidth limit of 512kbps and a link to Subzone B with
a pipe of 128kbps, any calls between the two subzones will still be limited to 128kbps.
a pipe of 128kbps, any calls between the two subzones will still be limited to 128kbps.
Bandwidth consumption of traversal calls
A non-traversal call between two endpoints within the same subzone would consume from that subzone the amount
of bandwidth of that call.
of bandwidth of that call.
A traversal call between two endpoints within the same subzone must, like all traversal calls, pass through the
Traversal Subzone. This means that such calls consume an amount of bandwidth from the originating subzone’s total
concurrent allocation that is equal to twice the bandwidth of the call – once for the call from the subzone to the
Traversal Subzone, and again for the call from the Traversal Subzone back to the originating subzone. In addition, as
this call passes through the Traversal Subzone, it will consume an amount of bandwidth from the Traversal Subzone
equal to that of the call.
Traversal Subzone. This means that such calls consume an amount of bandwidth from the originating subzone’s total
concurrent allocation that is equal to twice the bandwidth of the call – once for the call from the subzone to the
Traversal Subzone, and again for the call from the Traversal Subzone back to the originating subzone. In addition, as
this call passes through the Traversal Subzone, it will consume an amount of bandwidth from the Traversal Subzone
equal to that of the call.
Links and Pipes
Configuring Links
Links connect local subzones with other subzones and zones. For a call to take place, the endpoints involved must
each reside in subzones or zones that have a link between them. The link does not need to be direct; the two
endpoints may be linked via one or more intermediary subzones.
each reside in subzones or zones that have a link between them. The link does not need to be direct; the two
endpoints may be linked via one or more intermediary subzones.
Links are used to calculate how a call is routed over the network and therefore which zones and subzones are
involved and how much bandwidth is available. If multiple routes are possible, your VCS will perform the bandwidth
calculations using the one with the fewest links.
involved and how much bandwidth is available. If multiple routes are possible, your VCS will perform the bandwidth
calculations using the one with the fewest links.
The Links page (Configuration > Bandwidth > Links) lists all existing links and allows you to create, edit and delete
links.
links.
The following information is displayed:
Field
Description
Name
The name of the link. Automatically created links have names based on the nodes that the link is
between.
between.
Node 1 and
Node 2
The Traversal Subzone and the zone that the link is between.
The two subzones, or one subzone and one zone, that the link is between.
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Cisco TelePresence Video Communication Server Administrator Guide
Bandwidth Control