DLMI window
164
Model LRA2900A RAS Administrators’ Reference Guide
13 • Frame Relay
The Frame Relay link is now available. The final stage will be to configure PVCs and IP routing so they can use
these new links.
The following sections describe the additional variables on the DLMI window.
Note
Be careful not to change these variables unless your provider instructs
you to do so. The factory defaults generally provide the appropriate
settings for service.
Data Link Protocol
The layer 2 link protocol for Frame Relay is LAPF, otherwise referred to as Q.922. The factory default of
q922(4)
will be the most common.
DLCI Length
The DLCI identifies the virtual connection on the bearer channel for the Frame Relay Interface. The factory
setting of
two-octets(2)
represents 10-bit addressing. Your access server can support a maximum of 32 separate
PVCs or virtual channels per Frame Relay link.
Polling Interval (T391)
Each side of the Frame Relay interface, the Network side and the User side, communicate status. T391 is the
number of seconds between subsequent Status Enquiry messages. An Error Count is logged if no response
from the previous Status Enquiry message was received during the T391 interval. The default value is
10
.
Full Enquiry Interval (N391)
Status Enquiry messages are of two different varieties: 1) Link Integrity Verification, which simply exchange
sequence numbers between peers and 2) Full Status messages, which is a request from the peer for the list of all
active/inactive PVCs. The default is
6
.
Error Threshold (N392)
N392 is the number of errors (T392 and T391 timeouts and sequence number errors) before action is taken.
Action consists of changing all the PVCs from active to inactive. N392 must be less than or equal to N393.
The default value is
3
.
Monitored Events (N393)
Expected and unexpected events are counted up till the Event Count reaches N393, whereupon the Event
Count is cleared and the Error Threshold Count is cleared. Events consist of timer (T391 and T392) expira-
tions and received Status Enquiry messages. N393 must be greater or equal to N392. The default value is
4
.
Max Virtual Circuits
The maximum number of PVCs determines the amount of internal resources are allocated for the Frame Relay
system. The default value is
32
.
LMI Interface
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
Summary of Contents for LRA 2900
Page 29: ...Contents Model LRA2900A RAS Administrators Reference Guide 29 ...
Page 33: ...About this guide Model LRA2900A RAS Administrators Reference Guide 33 ...
Page 63: ...5 Authentication Model LRA2900A RAS Administrators Reference Guide 63 Modify Static User ...
Page 72: ...72 Model LRA2900A RAS Administrators Reference Guide 7 Dial In ...
Page 201: ...16 MFR Version 2 Model LRA2900A RAS Administrators Reference Guide 201 ...
Page 211: ...16 MFR Version 2 Model LRA2900A RAS Administrators Reference Guide 211 MFR Version 2 Modify ...
Page 268: ...268 Chapter 22 About Chapter contents Introduction 269 Black Box contact information 269 ...
Page 273: ...23 License Model LRA2900A RAS Administrators Reference Guide 273 End User License Agreement ...
Page 278: ...278 Appendix B MIB trees Chapter contents Model LRA 2900 MIB Tree Structure 279 ...