Chapter 3: Terminal Menu Operation and Structure
Frame Relay/Maintenance Protocol
Write security: 3, Read security: 5
The Frame Relay maintenance protocol is used on the WAN port. The main- tenance protocol is used to send link status and virtual circuit information be- tween Frame Relay switches and other devices (such as routers) that communicate with them. Possible choices are listed below.
Annex D (def) - This is an ANSI standard and is the most commonly used standard in the US.
Annex A - This is the CCITT European standard.
LMI - This was developed by a vendor consortium and is also known as the “consortium” management interface specification. It is still used by some carriers in the U.S.
Static - This should be selected when there is no Frame Relay switch in the circuit. The DLCIs are assigned in the DLCI Mapping and must be the same for the device it will communicate with.
Frame Relay/Polling Frequency
Write security: 3, Read security: 5
This parameter is the interval that the Express L768/L1.5 polls the Frame Re- lay switch using the maintenance protocol selected above. The Express L768/ L1.5 is required to poll the Frame Relay switch periodically to determine whether the link is active. The value is in seconds and ranges from 5 to 30 sec- onds with a default of 15 seconds.
Frame Relay/DLCI Mapping
This menu allows each DLCI to be mapped to a particular Frame Relay main- tenance protocol. Each protocol parameter can be individually configured for each DLCI. By factory default, the DLCI map is empty.
When empty and a maintenance protocol other than static is used, the Express L768/L1.5 will poll the switch to determine which DLCIs are active. These ac- tive DLCIs will attempt to determine the IP and IPX addresses on the other end of the virtual circuit using Inverse ARP (IARP). If there is a response, the net- work learned will be added to the router tables and the virtual circuit will be treated as an unnumbered interface. Bridge mode is not attemped in this case.
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