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Point-to-Point Protocol (PPP)
The district local LAN and the district WAN are connected through serial and frame relay connections. These connections are controlled by protocols that operate like Layer 2 LAN protocols. In order for the LAN to WAN connections to function correctly a regimented set of procedures must be enforced.
1. Link Establishment and Configuration Negotiation
2. Link-Quality Determination
3. Network Layer Protocol Configuration Negotiation
4. Link Termination
The above are the 4 procedures in PPP encapsulation. We are using PPP because it can be easily setup and is widely supported.
PPP is designed to allow the simultaneous use of multiple network-layer protocols. PPP supports other protocols besides IP, including IPX and DECnet.
The PPP implementation on serial 0 interface is achieved by using the following router commands :
Sunset# config terminal
Sunset(config)# username [hostname] password [password]
Sunset(config)# interface s0
Sunset(config-if)# encapsulation ppp
Sunset(config-if)# ppp authentication chap
Sunset(config-if)# ppp chap hostname [hostname]
Sunset(config-if)# ppp chap password [password]
Sunset(config-if)# ^z
Sunset# copy run start