22-19
Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 22 Configuring Multilink Point-to-Point Protocol Connections
MLP on LNS
• 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
About MLP on LNS
The multilink interface-based configuration requires one virtual template per bundle so that the
multilink group # command can be configured on the virtual template. However, for the MLP on LNS
feature, you can only scale up to 2000 virtual templates.
To address the virtual template scaling issue and to avoid cumbersome configuration management, in the
Cisco IOS 12.2(33)SB release, virtual access bundles are supported. In virtual access bundles, the bundle
interface is cloned from the virtual template when the first member link is negotiated on the LNS. The
virtual access bundle support is limited to bundle termination on LNS.
Before the Cisco IOS 12.2(33)SB release, multilink interface-based configuration was used to
distinguish between single and multi-member bundles. However, for the virtual access based bundle
interface, you can no longer use the interface number range to distinguish between single and
multi-member bundles because the bundles are generated dynamically in the Cisco IOS 12.2(33)SB
release. To distinguish single and multi-member bundles, the user-specified value for the ppp multilinks
max link # command is used.
The following two diagrams show two different MLP on LNS bundle configurations supported with the
Cisco IOS 12.2(33)SB release.
Figure 22-4 shows MLP on CPE for dial-up networks.
Figure 22-4 MLP on LNS–Multimember Bundle
Figure 22-5 shows a single-member bundle on the CPE. These are single-member bundles where the
traffic received by the Cisco 10000 router is fragmented to interleave high-priority traffic in between
low-priority network traffic.
270325
L2TP
Upstream
• Reassembly of MLP
Downstream
• MLP
• No QoS
• No MLP fragmentation and interleaving
Upstream
• MLP
(Multiple links per bundle)
MLP
Multiple links per bundle
Cisco 10000
series router
PRE3 LNS
CPE
NAS
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