Cisco Cisco Expressway メンテナンスマニュアル
Figure 11 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 Expressway 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 Expressway raises an alarm if the total port requirement could exceed the
port range you specify.
What is the default range?
The default media traversal port range is 36000 to 59999, and is set on the Expressway-C at Configuration
> Traversal Subzone. In Large Expressway systems the first 12 ports in the range – 36000 to 36011 by default – are
always reserved for multiplexed traffic. The Expressway-E 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
Expressway-E (Configuration > Traversal > Ports). If you choose not to configure a particular pair of ports (Use
configured demultiplexing ports = No), then the Expressway-E will listen on the first pair of ports in the media
traversal port range (36000 and 36001 by default).
> Traversal Subzone. In Large Expressway systems the first 12 ports in the range – 36000 to 36011 by default – are
always reserved for multiplexed traffic. The Expressway-E 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
Expressway-E (Configuration > Traversal > Ports). If you choose not to configure a particular pair of ports (Use
configured demultiplexing ports = No), then the Expressway-E will listen on the first pair of ports in the media
traversal port range (36000 and 36001 by default).
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 Expressway, 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).
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).
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
.
Configuring Subzones
The Subzones page (Configuration > Local Zone > Subzones) lists all the subzones that have been configured on the
Expressway, and allows you to create, edit and delete subzones. For each subzone, it shows how many membership
rules it has, how many devices are currently registered to it, and the current number of calls and bandwidth in use. Up
to 1000 subzones can be configured.
Expressway, and allows you to create, edit and delete subzones. For each subzone, it shows how many membership
rules it has, how many devices are currently registered to it, and the current number of calls and bandwidth in use. Up
to 1000 subzones can be configured.
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Cisco Expressway Administrator Guide
Bandwidth Control