Table of Contents

Understanding Discovery Protocols
Updating the Discovery Process

Restarting Discovery
Rediscovering a Device
Changing Discovery Parameters
Adding and Removing VTP Domains

Resolving Discovery Problems

Discovering Your Network

When you install CWSI Campus, it automatically discovers your network devices starting with the seed device you specified during installation and displays a map of your network in the CWSI Campus map window.

You can use the discovery process to force network discovery. You can also modify the discovery process, for example, to change a network timeout interval.

The following sections provide you with detailed information to successfully discover your network:

• Understanding Discovery Protocols

• Updating the Discovery Process

• Resolving Discovery Problems

Understanding Discovery Protocols

CWSI Campus uses a background process called asynchronous network interface (ANI) to perform its discovery. The ANI process uses the following protocols:

• Cisco Discovery Protocol (CDP) is a link-layer discovery protocol that discovers all Cisco devices that communicate at Layer 2, for example, devices in an Ethernet or Token Ring LAN.

• Integrated Local Management Interface (ILMI) is an ATM Forum standard discovery mechanism that provides information about discovering devices on an ATM network at the ATM physical connectivity level.

Updating the Discovery Process

If you have properly prepared for discovery, CWSI Campus automatically discovers your network. However, you can make any of the following changes in the discovery process:

• Restarting Discovery

• Rediscovering a Device

• Changing Discovery Parameters

• Adding and Removing VTP Domains

Restarting Discovery

From the CWSI Campus map window, select View>Rediscover Map. The Discovery process runs and updates the current network map.

Rediscovering a Device

You may need to rediscover a device because a condition or attribute about that device has changed since the last discovery.

Step 1 Select the device on the CWSI Campus map.

Step 2 Select Edit>Rediscover Device.

Changing Discovery Parameters

After the initial network discovery, you can modify certain parameters, such as the discovery and polling intervals; extend discovery beyond routers; and change or add the seed device used for discovery.

To change the discovery parameters, follow these steps:

The Discovery options are displayed. (See Figure 3-1.)

Figure 3-1: CWSI Campus Properties: Discovery

Step 3 Change the discovery parameters as described in Table 3-1.
Table 3-1: Discovery Parameters

Field	Description
Discovery Interval	The discovery interval indicates the interval at which CWSI Campus runs the discovery process. The default interval is 30 minutes. You can reduce or increase this interval depending on the size of your network. For a very large network, you might need to increase the interval.
Polling Interval	After CWSI Campus discovers your devices, the discovery process continues to poll the status of the discovered devices. The default polling interval is 300 seconds (5 minutes), but you can change the frequency of this polling.
Jump Router Boundaries	By default, discovery extends until it reaches a router. However, you can extend discovery beyond the boundaries set by routers on your network. If you choose to extend the discovery boundaries, you should be cautious about how far you extend them. Discovery could take much longer if you do not selectively choose the boundaries by disabling CDP on devices such as gateways. Also, you can ensure more reliable discovery of remote VTP domains by adding a seed device from them (see the "Selecting a Seed Device" section in Chapter 2, "Preparing for Network Discovery").
Seed Device	The discovery seed device is the device from which you start the discovery process. When you installed CWSI Campus, you specified a seed device. Whenever you run the network discovery process, the seed device is used to initiate the discovery process. Step 1 Enter the IP address of the new seed device. Step 2 Click Add to add the seed device to the list. Step 3 Select the newly added seed device. The selected seed device will be used for the next scheduled discovery. If you want to perform an immediate discovery process, from the CWSI Campus map, select View>Rediscover Map.

Step 5 To retain these changes to discovery, select File>Save ANI Properties.

Adding and Removing VTP Domains

Step 2 In the CWSI - Properties window, select the Domains tab. (See Figure 3-2.)

Figure 3-2: CWSI Campus Properties: Domains

Resolving Discovery Problems

If you have difficulty with the discovery process, refer to the "Working with Discovery" section of Chapter 8, "Troubleshooting". This section provides you with detailed troubleshooting information.

Posted: Mon Nov 15 10:29:15 PST 1999
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