Configure Cisco ACS

In this chapter we will go through basic Cisco ACS configuration. We will describe how you can create network device groups, users that will be able to access the devices in these groups, and the authorization policies that will determine the rights the users will be granted on these devices.

Here is a brief description of some of the components in ACS:

  • Network device groups – groups of network devices, usually with similar functions.
  • Identity groups – groups of users.
  • User accounts – user accounts will be placed in the Identity groups.
  • Authorization profiles – profiles that control what rights are permitted. They are associated with a Network device group and an Identity group.

In our example, we will create the following:

  • a single device group named RoutersHQ for the routers.
  • a single router that will be placed in the RoutersHQ device group.
  • two Identity groups – Admin and HelpDesk
  • two users – an administrator that will be placed in the the Admin group, and a user that will be placed in the HelpDesk group.
  • two authorization policies – the AdminRole group with the full privilege level 15 access, and the HelpDeskRole with the privilege level 1 access to the devices in the RoutersHQ device group.

To start with the ACS configuration, open your browser and browse to the https://ACS_IP/acsadmin, where ACS_IP is the IP address of your ACS server. Log in with the username of acsadmin and the password of default:

acs first login

You will be prompted to change the default password:

acs change password

A newly installed Cisco ACS requires proper licensing. To get your free evaluation license, go here here. Log in with your Cisco account and select Get Other Licenses > Demo and Evaluation. Search for secure and finish the license wizard.

Once we’ve applied the license, we can create the ACS components listed above. First, we need to create a device group called RoutersHQ. To do so, go to Network Resources > Network Device Groups > Device Type > Create:

acs create device group

Enter the device group information and click the Submit button:

acs device group information

After the device group has been created, we need to add a router in it. To do this, go to Network Resources > Network Devices and AAA Clients > Create:

acs add aaa client

Under Name, enter the name for the router (it does not have to match the real router’s hostname). Under Device Type, select the device group you’ve created in the previous step. Under IP address, enter the IP address of the router. Under Authentication options, click the checkbox next to the protocol that will be used and type the password.

acs add device group

Next, we need to create two user groups: Admin and HelpDesk. To do this, go to Users and Identity Stores > Identity Groups > Create:

acs create identity group

Enter the group information:

acs create identity group 1

Repeat the process to create the second group:

acs create identity group 2

Now we need to create two users and place them in the appropriate identity groups. To do that, go to Users and Identity Stores > Internal Identity Stores > Users > Create:

acs create users

Under Name, enter Administrator. Under Identity Group, select the Admin group. Under Password, configure the password for the user. When you are done, click Submit to create the user:

acs create users 1

Repeat the process for the Helpdesk user. Make sure to select the HelpDesk group:

acs create users 2

The next step is to create authorization policies to give full access to users in the Admin group and limited access to users in the HelpDesk group. Go to Access Policies > Access Services > Default Device Admin > Authorization > Create:

acs create authorization policy

Name this policy AdminRole. Under Identity Group, choose the Admin group. Under NDG:Device Type, choose the RoutersHQ device group. Click the Select button next to Shell Profile:

acs create authorization policy 1

We will not use the preconfigured profiles – we will create our own. Click Create:

acs create authorization policy 2

Name the profile and click the Common Tasks tab:

acs create authorization policy 3

Change the Default privilege level to Static, and assign the privilege level of 15:

acs create authorization policy 4

Click Submit. We need to repeat the process to create the HelpDeskRole:

acs create authorization policy 5

acs create authorization policy 6

This time, assign the privilege level of 1:

acs create authorization policy 7

We can now configure the router to use ACS for AAA.

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