Frame Relay Polling, Error Handling, and Specification Enhancements - Page 5

 By Cisco Press | Posted Jan 25, 2002
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LMI Extensions

The LMI global addressing extension gives Frame Relay DLCI values global rather than local significance. DLCI values become DTE addresses that are unique in the Frame Relay WAN. The global addressing extension adds functionality and manageability to Frame Relay internetworks. Individual network interfaces and the end nodes attached to them can be identified by using standard address-resolution and discovery techniques. Additionally, the entire Frame Relay WAN appears as a LAN to routers on the periphery.

The LMI multicasting extension allows multicast groups to be assigned. Multicasting saves bandwidth by allowing routing updates and address-resolution messages to be sent only to specific groups of routers. The extension also transmits reports on the status of multicast groups in update messages.

Our next segment from Cisco Press' Network Consultants Handbook will deal with Frame Relay Applications.

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