Name: Cisco IOS XE Intelligent Services
Brand: Cisco
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Configuring ISG Access for PPP Sessions

Prerequisites for ISG Access for PPP Sessions

For information about release and platform support, see the “Feature Information for ISG Access for PPP

Sessions” section on page 13.

The specific access protocol that is being used must be provisioned on the interface.

If local PPP authentication is required, the ppp authentication command must be configured on the

interface or virtual template.

The tasks and examples in this document assume that you know how to configure and use ISG control

policies. See the module “Configuring ISG Control Policies” for information about how configure

control policies.

Restrictions for ISG Access for PPP Sessions

In Cisco IOS XE, SSO and ISSU are not supported for the following features on ISG PPP sessions:

• Port-Bundle Host Key

• Layer 4 Redirect

• Traffic Class

• Accounting

Information About Configuring ISG Access for PPP Sessions

Before you configure access for PPP sessions, you should understand the following concepts:

• Overview of ISG Access for PPP Sessions, page 2

• ISG Subscriber IP Address Management for PPP Sessions, page 3

• VRF Transfer for PPP Sessions, page 3

• Default Policy for ISG Access for PPP Sessions, page 3

Overview of ISG Access for PPP Sessions

Layer 2 sessions are established by means of control protocols that operate between the peer entities and

the ISG device. Typically, Layer 2 sessions are encapsulated to isolate them from other sessions on the

same physical media.

Although the system provides default handling for Layer 2 sessions, you may want to configure policies

to forward or locally terminate the protocol or to locally authenticate subscribers on the basis of identity

data that is collected from the access protocol. ISG control policies can be configured to extract identity

and credentials of peer entities from access protocols. This mechanism allows services to be provisioned

for Layer 2 sessions on the basis of any identity pertaining to the session, whether explicitly provided

via the protocol or native to the underlying media or access port.

ISG supports the following Layer 2 access protocols:

• PPP

• PPP over Ethernet (PPPoE)

Cisco IOS XE Intelligent Services User Manual

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