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9
C
ONFIGURING
PPP, MLPPP,
AND
HDLC
9.1Layer Two Configurations: PPP, MLPPP, and
HDLC
Black Box systems may be configured for a variety of Layer 2 protocols. This document outlines High-level Data Link
Control (HDLC), Point to Point Protocol (PPP), and Multilink PPP (MLPPP) configurations. Other Black Box
documents outline Frame Relay and Multilink Frame Relay configuration.
Black Box LR1104A systems are often used at POPs to aggregate data for WAN transmission. The following figure
details PPP and multilink PPP connections from two CPE sites to a main site.
Figure 17 PPP/MLPPP Application
Site 1 uses a Black Box LR1114A system to establish a 6 Mbps MLPPP connection (four T1 lines) to the main site. In
this example, MLPPP segmentation is configured lower than the default setting of 512 bytes, and the differential delay
tolerance is tighter than the default 128 milliseconds.
Site 2 connects to the main site over a single T1 link with PPP encapsulation. The LR1104A system PPP parameters
(i.e., the maximum transmit and receive byte sizes) are adjusted to comply with the Site 1 router configuration.
Tasman 1400
Tasman 6300
SITE 1
S
ITE 2
WAN
Router/DSU
CT3
4 x T1
(MLPPP)
LR1114A
LR1104A