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314470-15.5 Rev 00 18-1
Chapter 18
Configuring PPP Services
Version 15.5.0.0
The following section is new to Chapter 3, “Customizing PPP Services” in
Configuring PPP Services.
Multi-Class Extension to Multi-Link PPP
Beginning with version 15.5.0.0, BayRS supports RFC 2686, “Multi-Class
Extension to Multi-Link PPP.” This feature provides a Layer 2 fragmentation and
interleaving solution for Point-to-Point Protocol (PPP) wide area networks
(WANs) that ensures high voice quality for voice over IP (VoIP) packets
transmitted with data packets over a WAN. When this feature is enabled, large
data packets are fragmented into smaller packets and higher-priority voice packets
are sent between (interleaved with) the data packet fragments.
Multiclass extension (MCE) to multilink PPP (MLPPP) is a QoS enhancement for
bandwidth limited PPP connections (link speeds less than T1 speeds). Utilization
of this feature minimizes the serialization delay and delay variance (jitter) of VoIP
packets over low speed links by fragmenting large data packets and interleaving
higher-priority voice packets with the data packet fragments.
Packets are prioritized based on PPP service classes that are defined in the MLPPP
header. A mapping has been defined between the PPP service classes and DiffServ
Code Points (DSCPs) in IP headers based on Nortel Networks Service Class
(NNSC) definitions. The mapping of PPP Classes to DSCP is shown in
Table 18-1
.
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