Information Technology Reference
In-Depth Information
LMI Fields
Table 5-7
Field
Description
LMI DLCI
The LMI DLCI is 1023 if you use a cisco-type LMI. It is 0 if you use either ANSI or
ITU (q333a).
UII
Unnumbered Information Indicator; sets the poll/final bit to zero.
PD
Protocol Discriminator; contains a value indicating the frame is an LMI frame.
Call Ref
Call Reference. This field always contains 0s. It is not currently used.
Message type
Status-inquiry message—Allows a user device to inquire about the status of the network.
Status message—Response to an inquiry message.
IE
Information Elements; contains IE identifiers and data.
FCS
Frame Check Sequence; verifies the data.
Flags
Delimits the beginning and end of the frame and is always binary 01111110.
FRTS Traffic Shaping Commands
Table 5-8
Command
Description
frame-relay traffic-rate
average
[
peak
]
Defines the traffic rate for the VC.
frame-relay adaptive-shaping
{
becn
|
foresight
}}}}
Enables dynamic traffic shaping based on
received BECNs or ForeSight. ForeSight is a
Cisco proprietary traffic control mechanism.
This command replaces
frame-relay becn-
response-enable
.
frame-relay custom-queue-list
list
-
number
Defines a custom queue list number to apply
to the VC.
frame-relay priority-group
list-number
Defines a priority group number to apply to
the VC to enable priority queuing.
ISDN Devices
Table 5-9
Device
Description
TE1
Any terminal or router with an ISDN BRI. This device has a 4-wire interface.
TE2
Any terminal or router without a BRI; it connects to the TA through an EIA/TIA-232 or
V.35 interface.
TA
Connects the TE2 device to the ISDN network. Its input is the physical EIA/TIA-232
interface and its output is the ISDN BRI.
NT1
Usually the device that connects the 4-wire BRI to the 2-wire phone line.
NT2
NT2 devices provide switching and concentration of ISDN lines on the customer premise.
LE
Carrier's ISDN CO.
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