Cisco Cisco Expressway Maintenance Manual
About subzones
The Local Zone is made up of subzones. Subzones are used to control the bandwidth used by various parts
of your network.
of your network.
Three special subzones — the Default Subzone, the Traversal Subzone and the Cluster Subzone (only
applies if the Expressway is in a cluster) — are automatically created and cannot be deleted.
applies if the Expressway is in a cluster) — are automatically created and cannot be deleted.
Note that the Traversal Subzone is the only configurable subzone.
Default links between subzones
The Expressway is shipped with the Default Subzone and Traversal Subzone (and Default Zone) already
created, and with links between them. If the Expressway is added to a cluster then default links to the
Cluster Subzone are also established automatically. You can delete or amend these
created, and with links between them. If the Expressway is added to a cluster then default links to the
Cluster Subzone are also established automatically. You can delete or amend these
if you need
to model restrictions of your network.
About the Traversal Subzone
The Traversal Subzone is a conceptual subzone. Its sole purpose is to control the bandwidth used by
.
The
Traversal Subzone
page (
Configuration > Traversal Subzone
) allows you to place bandwidth
restrictions on calls being handled by the Traversal Subzone and to configure the range of ports used for the
media in traversal calls.
media in traversal calls.
Configuring bandwidth limitations
All traversal calls pass through the Traversal Subzone, so by applying bandwidth limitations to the Traversal
Subzone you can control how much processing of media the Expressway will perform at any one time. These
limitations can be applied on a total concurrent usage basis, and on a per-call basis.
Subzone you can control how much processing of media the Expressway will perform at any one time. These
limitations can be applied on a total concurrent usage basis, and on a per-call basis.
for more details.
Configuring the Traversal Subzone ports
On
Configuration > Traversal Subzone
you can configure the range of ports used for media in traversal
calls.
What is a valid range to use?
You can define the media port range anywhere within the range 1024 to 65533. Traversal media port start
must be an even number and Traversal media port end must be an odd number, because ports are
allocated in pairs and the first port allocated in each pair is even.
must be an even number and Traversal media port end must be an odd number, because ports are
allocated in pairs and the first port allocated in each pair is even.
How big should the range be?
Up to 48 ports could be required for a single traversal call, and you can have up to 100 concurrent traversal
calls on a small/medium system, or 500 concurrent traversal calls on a large system. The default range is
thus 48*500 = 24000 ports.
calls on a small/medium system, or 500 concurrent traversal calls on a large system. The default range is
thus 48*500 = 24000 ports.
Cisco Expressway Administrator Guide (X8.5.1)
Page 182 of 399
Bandwidth control
About subzones