Frame-Relay Layer 2 technology Leased line to Frame-Relay network – a telco provided cloud Frame-Relay is the technology deployed between the router and the Frame-Relay switch Used for one connection to a mesh network per site

Frame Relay Data Link Connection Identifier (DCLI) is the Layer 2 address A number used to identify the end point in a frame relay network. DLCI 1023 is reserved for LMI updates Committed Information Rate (CIR) – bandwidth which has been ‘purchased from supplier’ Burst Rate – Additional bandwidth utilised, is not guaranteed and has the DE bit set

Resolving IP/DLCI Inverse ARP An automatic system that enables a router to link an IP address to a DCLI Determines the IP address of a distant host Resolves IP addresses to DLCI A Frame-Relay map is a manual configuration, mapping IP and DLCI number frame-relay map ip

Types Point to point - like a standard serial line (each sub-interface on its own subnet) Multi point – all sub-interfaces are on the same subnet Multi point is often used to create an OSPF network. Causes problems with split horizon for dv routing protocols

Configuration Commands Router (config)#int s0/0 #encapsulation frame-relay #int s0/0.1 point to point # ip address #Frame-relay interface-dlci 22

LMI Layer Management Interface Informs routers of the dcli numbers that are relevant and pvc status Status values:- Active – end to end connectivity Inactive – other end wants response Deleted - our end is down