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DLCI window
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Model 3120 RAS Administrators’ Reference Guide
14 • Frame Relay
LMI Interface (frDlcmiInterface)
LMI is used in the generic sense as an in-band signaling system. The signaling is slightly different depending
on which end of the Frame Relay Interface it is, or in other words its orientation. The User end issues periodic
STATUS ENQUIRY messages and waits for a STATUS reply from the Network. The USER setting is correct
if the access server is a DCE connecting to a Frame Relay network. It is possible to configure an access server to
“look” like a Frame Relay Network. By setting the LMI Interface to NETWORK, you can connect another
Frame Device directly to the access server. This is also the setting if you were to connect two access servers
back-to-back without the benefit of an established Frame Relay network.
Bidirectional Polling(frDlc rDlcmiPollingBiDir)
Bidirectional Polling pertains only to the Network LMI side. If enabled, the Network LMI issues STATUS
ENQUIRY messages and waits for a STATUS reply from the User.
Polling Verification (T392)( frDlcmiPollingVerification)
Polling Verification pertains only to the Network LMI side. It is the amount of time permitted without receiv-
ing a STATUS ENQUIRY message from the User before Counting an Error.
DLCI window
The Data Link Connection Identifier (DLCI) provides each PVC with a unique identifier at both the access
server and the Frame Relay switch. Within each link (DLMI) there can be multiple Permanent Virtual Circuits
(PVC). Each of these PVCs are point-to-point links to remote locations, and define the data path between the
access server and the Frame Relay network.
Within each DLMI are one or more Data Link Channel Identifier (DLCIs). This is the identification of a PVC
within the Frame Relay link.
There will be at least one PVC automatically installed. This is the management DLCI or LMI. This DLCI,
often DLCI 0, is the communication channel between the access server and the Frame Relay network switch.
This management channel communicates configuration and health information of the Frame Relay link. See
Figure 74.
Figure 74. DLMI—Configuration View window
Summary of Contents for 3120
Page 8: ...Contents Model 3120 RAS Administrators Reference Guide 8...
Page 12: ...About this guide Model 3120 RAS Administrators Reference Guide 12...
Page 134: ...8 Dial Out Model 3120 RAS Administrators Reference Guide 134 An example section of dialout...
Page 140: ...9 Callback Access Server Administrators Reference Guide 140 Dialout...
Page 176: ...13 Filter IP Model 3120 RAS Administrators Reference Guide 176 An example of using a filter...
Page 226: ...17 MFR Version 2 Model 3120 RAS Administrators Reference Guide 226 MFR Version 2 Modify...
Page 238: ...19 SNMP Model 3120 RAS Administrators Reference Guide 238 Out...
Page 304: ...25 License Model 3120 RAS Administrators Reference Guide 304 End User License Agreement...
Page 309: ...309 Appendix B MIB trees Chapter contents Model 2960 MIB Tree Structure 310...