Cisco 10000-2P2-2DC Software Guide - Page 497

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 Upstream • Reassembly of MLP Downstream • MLP • No QoS • No MLP fragmentation and interleaving Upstream • MLP (Multiple links per bundle) Cisco 10000 series router PRE3 LNS NAS CPE 270325 L2TP MLP Multiple links per 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. OL-2226-23 Cisco 10000 Series Router Software Configuration Guide 22-19