Chapter 12. X.25 over Frame Relay: Using the Annex G Feature
X.25 is a legacy WAN communication protocol established by the International Telecommunication Union-Telecommunication Standardization Sector (ITU-T) in the 1970s. Similar to Frame Relay, X.25 is designed to interconnect user devices and network devices across geographically dispersed areas. X.25 is designed to operate effectively over any transmission medium regardless of the quality of the line. The X.25 protocol has a built-in error recovery mechanism, which allows it to work over poor-quality transmission media.
This chapter discusses the functionalities of Annex G, a feature that allows X.25 protocol to be transported over a Frame Relay network. The Cisco IOS software supports the ...
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