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Configuring PPP CHAP Authentication
For interfaces with PPP encapsulation, you can configure interfaces to support the PPP Challenge Handshake Authentication Protocol (CHAP), as defined in RFC 1994, PPP Challenge Handshake Authentication Protocol (CHAP). When you enable CHAP on an interface, the interface can authenticate its peer and can be authenticated by its peer.
For information about configuring CHAP, see Configuring the PPP Challenge Handshake Authentication Protocol.