Packet Tracer: WAN, point to point links.
- 1. RAFAT KHANDAKER PACKET TRACER WAN LINKS POINT TO POINT 05/09/16 . ABSTRACT Configuring point to point WAN serial interface with multiple encapsulation types such as: HDLC, PPP, Frame relay. Testing configuration settings in packet tracer to study different WAN link settings through DCE/DTE serial interfaces. INTRODUCTION Serial interfaces on WAN links, going to the ISP, are encapsulated with certain protocols to govern point to point connections. HDLC is a cisco proprietary protocol used for cisco routers to communicate point to point links, It use a checksum error but the protocal is not widely used. PPP protocol is more universally used because it supports more router vendors, other than cisco. PPP also allows CHAP or PAP authentication between PPP devices. Frame Relay is more commonly used due to it's hi-speed availability and also more cheap to implementation.
- 2. HDLC encapsulation (Low left router to core) (LOWER LEFT ROUTER)
- 4. CORE ROUTER ( Simulating error with point to point mismatch )
- 5. NOTICE IT SAYS: " SERIAL INTERFACE IS UP, HOWEVER, LINE PROTOCOL IS DOWN." THIS IS THE ERROR WE EXPECT TO SEE WHEN PROTOCOL IS MISMATCHED. INTERFACE WHEN MATCHED :
- 6. WE CAN SEE IN THE ORANGE ( HDLC Point to Point )
- 7. PING IS SUCCESSFUL !! PPP WAN TO WAN LINK For PPP we have the option to encrypt our chanel with pap or chap authentication. PAP authentication is sent through the wan link in clear text, so the password to authenticate can easily be sniffed through traffic. CHAP authentication is somewhat better because the password is, at the minimum, hashed in an algorithm. Some other authentication that may be useful, MS- Chap V2, V3 which are more secure. PPP also allows us to compress or stack the data that we can send through the link. Bottom, Right Router config.
- 9. PING IS SUCCESSFUL !! show debug int s3/0 from core router : We can see that line protocol is up and LCP is open in ppp encapsulation. LCP is link control protocol, this needs to be in the open state before ppp can communicate through wan links.
- 10. FRAME RELAY POINT TO POINT NETWORK FRAME RELAY is a point to point local link usually between the ISP and the local management router. Frame Relay is cost effective and reliable. Frame Relay service provider guarantees a fixed bandwitdth. CIR, commited information rate is the commited bandwidth that the frame relay provider will give us. Frame Relay use packet switching protocol, where packets are transmitted and re-assembled in a frame-relay network. Frame Relay cloud, DCE routers in a frame switched network. Terms: PVC : permanent virtual circuit ( popular ) - available all the time. PVC use full mesh or partial mesh
- 11. Full Mesh Partial Mesh -Hub and spoke. SVC: switched virtual circuit - available under certain conditions. PVC use... LMI, Local Management Interface, which are Hello and response packets to keep Frame Relay PVC links up. DLCI
- 12. DLCI in a Frame Relay Network, Data-Link Connection Identifier. DLCI's are frame-relay layer 2 address, however, it can be re-used from router to router. - Inverse ARP --> usually enabled by default on a cisco interface running Frame-Relay. ( encapsulation frame-relay command and then open the interface. You're running inverse ARP. after configuration : enable mode: show frame map --> command to troubleshoot frame-relay CORE WAN ROUTER ( DCE ) TOP ROUTER
- 13. ping is unsuccessful MANUALLY CONFIGURING DLCI , INVERSE ARP on Frame Relay network TOP ROUTER
- 14. CORE ROUTER Show frame map - command from Core Router status is active and statically assigned... simulation purpose. Ping is still uncucessful..... Continuing troubleshooting.... I'm going to configure Frame Relay in a separate network for simulation, based on resource material from http://websistent.com/how-to-configure-frame-relay-in-cisco-packet-tracer/ From this document, I realized that static routing needs to be configured in order for Frame- Relay to function.
- 15. Fixing original packet tracer diagram Core Router Top Router Ping is still unsuccessful from previous problem. I am going to configure Frame Relay wih a frame relay cloud network. I noticed in this example that subinterfaces are configured with point to point on the same DLCI address. I hope this configuration helps to identify Frame-Relay under more reliable circumstances. ROUTER 0
- 17. ALL SETTINGS ARE CORRECTLY CONFIGURED EXCEPT FOR THE CLOUD AT THIS POINT * packet tracer will not let me configure the cloud * error.* ... the configuration should be right at this point, a frame relay table needs to be configured. RESULTS In this lab I have been able to configure WAN point to point link connections. I was able to successfully implement PPP and HDLC networks. Frame-Relay networks was a prize worthy experience, I learned a lot about this network. I will attempt to do more research to fix Frame relay, from what I know so far, Frame-Relay at this network was configured correctly. RESOURCES: https://www.youtube.com/watch?v=8JlGioR6JlI http://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/25647- understanding-ppp-chap.html http://www.cisco.com/c/en/us/td/docs/ios/12_2/debug/command/reference/122debug/dbfintro.ht ml