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Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 22 Configuring Multilink Point-to-Point Protocol Connections
MLP on LNS
• If link fragmentation and interleaving (LFI) is enabled, only one link is used for interleaving. For
more information, see the “Fragmenting and Interleaving Real-Time and Nonreal-Time Packets”
chapter in the
Cisco 10000 Series Router Quality of Service Configuration Guide.
• We strongly recommend that you use only strict priority queues when configuring Multi-VC MLP
over ATM-based LFI. For more information, see the “Prioritizing Services” chapter in the
Cisco 10000 Series Router Quality of Service Configuration Guide.
MLP on LNS
Networks are migrating from the digital subscriber line (DSL) aggregation network connectivity to
broadband remote access server (BRAS), with the mix of Ethernet and ATM access networks. Therefore,
there is an increasing need to support MLP, and, link fragmentation and interleaving (LFI), to allow
high-priority, low-latency packets to be interleaved between fragments of lower-priority, higher-latency
packets. Voice over IP (VoIP) is an example of a low-latency service.
In the Cisco 12.2(33)SB release, the MLP on LNS feature is introduced for asymmetric digital subscriber
line (ADSL) deployments where the upstream bandwidth (BW) is low. The MLP on LNS feature can
receive fragments from the customer premises equipment (CPE), ensuring that there is less latency
upstream, even if a large packet gets in between the voice packets.
The MLP on LNS feature bundles together a virtual private dial network (VPDN) session on a single
logical connection, which forms an MLP bundle on the LNS. Before the Cisco IOS 12.2(33)SB release,
Cisco 10000 series routers supported only multilink bundle termination on the PPP termination
aggregation (PTA) router. In the Cisco IOS 12.2(33)SB release, Cisco 10000 series routers support MLP
termination on the LNS also.
Figure 22-3 shows an MLP on LNS application.
Figure 22-3 MLP on LNS Application
The MLP on LNS feature is described in the following sections:
• About MLP on LNS, page 22-19
• PPP multilink links max Command, page 22-21
• PXF Memory and Performance Impact for MLP on LNS, page 22-21
• Restrictions and Limitations for MLP on LNS, page 22-23
• Configuring MLP on LNS, page 22-24
270324
Router
Digital
Remote user
Internet service
provider
Analog
A
Call
Call
L2TP or L2F
tunnels
Cisco 10000
PRE3
B
C