# Network Zone Topology

## Purpose

The Network Zone Topology form allows you to model the IP network connectivity and assign bandwidth limits at bottleneck points. You model the data network by building a Spanning Tree topology, where the network is divided into zones that have zone access points (ZAPs) between them. See About Zones and ZAPs for information and example configurations.

The sub-form Network Zone Topology identifies a bandwidth limit and the managing ICP for up to six zone access points between the zone and its parent zone.

Use this form to perform the following tasks:

- Program Bandwidth Management

- Bandwidth Management Configuration form

For more information:

- Bandwidth Management - Introduction

## Conditions

- This form and sub-form must be shared with all ICPs in the network that perform bandwidth management. If this form is not shared, Bandwidth Management may not function properly if the user enters conflicting configuration information into the network elements.

## Field Descriptions

Parameter | Description | Default Value
Zone ID | The number of the Zone in the range 1 to 999. The Zone ID must exist in the Network Zones form. Zone IDs must be unique; you cannot reference the same zone twice. See Configuring a Simple Network and Configuring a Complex Network for more information. | Blank
Zone Label | A read-only field with the name of the Zone provided in the Network Zones form. |
Parent Zone ID | Enter the number of the Parent Zone in the range 1 to 999. The Parent Zone ID must exist in the Network Zones form. | Blank
Parents Ancestors 1 | Read-only field that contains the Parent Ancestors of the Zone ID. |
Parents Ancestors 2 | Read-only field that contains the Parent Ancestors of the Zone ID. |
Parents Ancestors 3 | Read-only field that contains the Parent Ancestors of the Zone ID. |
Parent Ancestors 4 | Read-only field that contains the Parent Ancestors of the Zone ID. |
Media Path Anchor Zone ID | Enter the Parent Zone ID in the range 1 to 999 to indicate that the parent of the zone contains a device which anchors the media path. This means that the media paths associated with the call made between the devices in the zone must travel to the parent zone, and back to the child zone. See Configuring Bandwidth Management for Teleworkers for an example that shows how to use Media Path Anchor Zone IDs. NOTE: When this field is set to the Parent Zone ID, the zone must have only one zone access point (ZAP) between that zone and the parent zone. | Blank
Perimeter Zone | Enter Yes to indicate that media paths that traverse the zone are heading out of the region, or into the region. You use perimeter zones to isolate the bandwidth management of certain regions of the network from the bandwidth management of other regions to simplify measurement and alarm reporting. See Simplifying BWM within a Network for an example that illustrates this concept. | No
Zone Access Point Assignment
Zone Access Point ID | A read-only field containing the Zone Access Point (ZAP) ID. |
Zone Access Point Label | Enter a string to describe the access point, for example, you can use the name of the router, or the physical location. | Blank
Bandwidth Limit (kbit/s) | Enter the bandwidth limit for the Zone Access Point. The minimum bandwidth is 1 kbit/s (1,024 bits per second) and the maximum bandwidth is 1 Tbit/s (1,099,511,627,776 bits per second). | 1
Network Element | Specify the Network Element that manages this Zone Access Point. NOTE: If you remove the Network Element from this form, you also need to remove the ZAP label, and reset the Bandwidth Limit to 1. | Blank