Cisco Cisco TelePresence Video Communication Server Expressway 관리 매뉴얼
Figure 10 Maximum port allocation for a media traversal call
In practice, you probably won't reach the maximum number of concurrent traversal calls, have them all routed
through the B2BUA, and have all the possible types of media in every call. However, we defined the default range to
accommodate this extreme case, and the VCS raises an alarm if the total port requirement could exceed the port
range you specify.
through the B2BUA, and have all the possible types of media in every call. However, we defined the default range to
accommodate this extreme case, and the VCS raises an alarm if the total port requirement could exceed the port
range you specify.
What is the default range?
On new installations of X8.1 or later, the default media traversal port range is 36000 to 59999, and is set on the VCS
Control (Configuration > Local Zones > Traversal Subzone). In Large VCS Expressway systems the first 12 ports in
the range – 36000 to 36011 by default – are always reserved for multiplexed traffic. The VCS Expressway listens on
these ports. You cannot configure a distinct range of demultiplex listening ports on Large systems: they always use
the first 6 pairs in the media port range. On Small/Medium systems you can explicitly specify which 2 ports listen for
multiplexed RTP/RTCP traffic, on the VCS Expressway (Configuration > Traversal > Ports). On upgrades to X8.2 or
later, the VCS Control retains the media traversal port range from the previous version (could be 50000 - 54999 or
36000 - 59999, depending on source version). The VCS Expressway retains the previously configured demultiplexing
pair (either 2776 & 2777 or 50000 & 50001 by default, depending on upgrade path) and the switch Use configured
demultiplexing ports is set to Yes. If you do not want to use a particular pair of ports, switch Use configured
demultiplexing ports to No, then the VCS Expressway will listen on the first pair of ports in the media traversal port
range (36000 and 36001 by default). In this case, we recommend that you close the previously configured ports after
you configure the firewall for the new ports.
Control (Configuration > Local Zones > Traversal Subzone). In Large VCS Expressway systems the first 12 ports in
the range – 36000 to 36011 by default – are always reserved for multiplexed traffic. The VCS Expressway listens on
these ports. You cannot configure a distinct range of demultiplex listening ports on Large systems: they always use
the first 6 pairs in the media port range. On Small/Medium systems you can explicitly specify which 2 ports listen for
multiplexed RTP/RTCP traffic, on the VCS Expressway (Configuration > Traversal > Ports). On upgrades to X8.2 or
later, the VCS Control retains the media traversal port range from the previous version (could be 50000 - 54999 or
36000 - 59999, depending on source version). The VCS Expressway retains the previously configured demultiplexing
pair (either 2776 & 2777 or 50000 & 50001 by default, depending on upgrade path) and the switch Use configured
demultiplexing ports is set to Yes. If you do not want to use a particular pair of ports, switch Use configured
demultiplexing ports to No, then the VCS Expressway will listen on the first pair of ports in the media traversal port
range (36000 and 36001 by default). In this case, we recommend that you close the previously configured ports after
you configure the firewall for the new ports.
Configuring the Default Subzone
The Default Subzone page (Configuration > Local Zone > Default Subzone) is used to place bandwidth restrictions
on calls involving endpoints in the Default Subzone, and to specify the Default Subzone's registration, authentication
and media encryption policies.
on calls involving endpoints in the Default Subzone, and to specify the Default Subzone's registration, authentication
and media encryption policies.
When an endpoint registers with the VCS, its IP address and alias is checked against the subzone membership rules
and it is assigned to the appropriate subzone. If no subzones have been created, or the endpoint’s IP address or alias
does not match any of the subzone membership rules, it is assigned to the Default Subzone (subject to the Default
Subzone's Registration policy and Authentication policy).
and it is assigned to the appropriate subzone. If no subzones have been created, or the endpoint’s IP address or alias
does not match any of the subzone membership rules, it is assigned to the Default Subzone (subject to the Default
Subzone's Registration policy and Authentication policy).
The use of a Default Subzone on its own (without any other manually created subzones) is suitable only if you have
uniform bandwidth available between all your endpoints. Note that if your Local Zone contains two or more different
networks with different bandwidth limitations, you should configure separate subzones for each different part of the
network.
uniform bandwidth available between all your endpoints. Note that if your Local Zone contains two or more different
networks with different bandwidth limitations, you should configure separate subzones for each different part of the
network.
Default Subzone configuration options
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Cisco TelePresence Video Communication Server Administrator Guide
Bandwidth Control