Chapter 3 ACS 5.x Policy Model

Access Services

ACS accepts the results of the requests and returns them to the NAS. You must configure the external RADIUS and TACACS+ servers in ACS for ACS to forward requests to them. You can define the timeout period and the number of connection attempts.

The ACS proxy remote target is a list of remote RADIUS and TACACS+ servers that contain the following parameters:

IP

Authentication port

Accounting port

Shared secret

Reply timeout

Number of retries

Connection port

Network timeout

The following information is available in the proxy service:

Remote RADIUS or TACACS+ servers list

Accounting proxy local/remote/both

Strip username prefix/suffix

When a RADIUS proxy server receives a request, it forwards it to the first remote RADIUS or TACACS+ server in the list. If the proxy server does not receive a response within the specified timeout interval and the specified number of retries, it forwards the request to the next RADIUS or TACACS+ server in the list.

When the first response arrives from any of the remote RADIUS or TACACS+ servers in the list, the proxy service processes it. If the response is valid, ACS sends the response back to the NAS.

Table 3-7lists the differences in RADIUS proxy service between ACS 4.2 and 5.3 releases.

Table 3-7

Differences in RADIUS and TACACS+ Proxy Service Between ACS 4.2 and 5.3

 

 

 

 

Feature

 

ACS 5.3

ACS 4.2

 

 

 

Configurable timeout (RADIUS)

Yes

No

 

 

 

Configurable retry count (RADIUS)

Yes

No

 

 

 

Network timeout (TACACS+)

Yes

No

 

 

 

Authentication and accounting ports

Yes

Yes

(RADIUS)

 

 

 

 

 

 

Connection port (TACACS+)

Yes

No

 

 

 

Proxy cycles detection

Yes (For RADIUS only)

No

 

 

 

Username stripping

Yes

Yes

 

 

 

Accounting proxy (local, remote, or both)

Yes

Yes

 

 

 

Account delay timeout support (RADIUS)

No

No

 

 

 

 

User Guide for Cisco Secure Access Control System 5.3

3-8

OL-24201-01

 

 

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Cisco Systems OL-24201-01 manual Feature ACS, Radius