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Chapter 1
Introducing the Contivity Extranet Switch
The Switch
The Nortel Networks Contivity Extranet Switch 1500 Series provides scalable,
secure, manageable extranet access for up to 100 simultaneous users across the
Public Data Network (PDN). The Contivity Extranet Switch 1500 Series consists
of the 1500, 1510, 1520, and 1530 models.
The Switch includes the most popular tunneling protocols, IP Security (IPsec),
Point-to-Point Tunneling Protocol (PPTP), Layer 2 Forwarding Tunneling
Protocol (L2TP), and Layer 2 Forwarding (L2F). IPsec uses digital certificates,
password-based keys, and tokens for authentication; PPTP, L2TP, and L2F use
Challenge Handshake Authentication Protocol (CHAP) or Password
Authentication Protocol (PAP) for authentication. The PPTP implementation for
the Switch supports MS-CHAP authentication with 56- to 128-bit key encryption.
Figure 1-1 shows an intranet and an extranet.