
PPP Concepts
114068 Rev. A 2-17
Monitoring PPP Link Quality
To ensure that the router can successfully transfer data, PPP monitors the quality
of the point-to-point link with Link Quality Monitoring (LQM) and Link Quality
Report (LQR) packets. PPP supports LQM over standard synchronous interfaces
only. PPP does not support LQM over High-speed Serial Interfaces (HSSI). BNX
software, however, does support LQM and LQR over HSSI interfaces.
Used with these
data link types
• Bay Networks standard
synchronous
• Frame Relay direct mode
• PPP
PPP (only)
Media supported • Synchronous
• T1/E1
• MCE1/MCT1
• HSSI
• Synchronous
• T1/E1
• MCE1/MCT1
• ISDN B-channel drivers
• Raise-DTR/V.25bis modems
Packet
resequencing
Depends on the path selection:
• With address-based selection
(the default), packets always
arrive in sequence.
• With random path selection,
packets traveling on different
paths can arrive at their
destination out of sequence.
Multilink maintains the sequence
of packets sent over different lines
of the link.
Support for
bandwidth-on-
demand
No Yes
Miscellaneous • Address-based selection does
not always result in even
traffic distribution across all
data paths.
• Random selection provides for
even traffic distribution.
• All lines in a circuit must
negotiate and perform multilink.
• You cannot use nonmultilink
lines in a circuit with multilink
lines.
• All data packets sent over a
PPP multilink circuit travel as
multilink packets.
Table 2-3. Comparing Multiline and Multilink
(continued)
Feature Multiline Multilink
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