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13 • Frame Relay
Access Server Administrators’ Reference Guide
142
DLMI window
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
Содержание Access Server
Страница 24: ...Contents Access Server Administrators Reference Guide 24 ...
Страница 28: ...About this guide Model 2960 RAS Getting Started Guide 28 ...
Страница 32: ...1 Introduction Access Server Administrators Reference Guide 32 Saving HTTP HTML Object Changes ...
Страница 37: ...37 Chapter 3 Import Export Chapter contents Introduction 38 Export Configuration 38 Import Configuration 40 ...
Страница 48: ...4 Alarms Access Server Administrators Reference Guide 48 Modify Alarms Configuring alarm severity levels ...
Страница 58: ...5 Authentication Access Server Administrators Reference Guide 58 Static User Authentication ...
Страница 94: ...7 Dial In Access Server Administrators Reference Guide 94 Dial In User Statistics window ...
Страница 110: ...8 Dial Out Access Server Administrators Reference Guide 110 Dial Out User Statistics window ...
Страница 114: ...9 Drop and Insert Access Server Administrators Reference Guide 114 Drop and Insert main window ...
Страница 134: ...12 Filter IP Access Server Administrators Reference Guide 134 Defining a filter ...
Страница 148: ...13 Frame Relay Access Server Administrators Reference Guide 148 Link Status and the IP Forwarding ...
Страница 174: ...17 MFR Version 2 Access Server Administrators Reference Guide 174 ...
Страница 184: ...17 MFR Version 2 Access Server Administrators Reference Guide 184 MFR Version 2 Modify ...
Страница 190: ...18 RIP Version 2 Access Server Administrators Reference Guide 190 RIP Version 2 Statistics ...
Страница 196: ...19 SNMP Access Server Administrators Reference Guide 196 Out ...
Страница 248: ...23 TCP Access Server Administrators Reference Guide 248 TCP Details ...
Страница 252: ...24 UDP Access Server Administrators Reference Guide 252 Introduction ...
Страница 253: ...253 Chapter 25 About Chapter contents Introduction 254 Patton Electronics Company contact information 254 ...
Страница 258: ...26 License Access Server Administrators Reference Guide 258 End User License Agreement ...