Cisco 10000-2P2-2DC Software Guide - Page 481

Chapter 22 Configuring Multilink Point-to-Point Protocol Connections MLP Bundles Cisco IOS Release 12.2(31)SB2 12.2(33)SB 12.2(33)SB2 12.2(33)XNE Description Required PRE Support was added for the PRE3 and the valid multilink PRE3 interface ranges for MLP over serial or multi-VC MLP over ATM changed from 1 to 9999 (Release 12.2(28)SB and later) to from 1 to 9999 and 65,536 to 2,147,483,647. The MLPPP on LNS feature was introduced on the Cisco PRE3 and PRE4 10000 series router that is supported on the PRE3 and PRE4. This feature is not supported on the PRE2. The MLPoE LAC Switching feature was introduced on the PRE3 Cisco 10000 series router. The MLPoE at PTA feature was introduced on the Cisco PRE3 and PRE4 10000 series router. MLP Bundles MLP combines multiple physical links into a logical bundle called an MLP bundle (see Figure 22-1). An MLP bundle is a single, virtual interface that connects to the peer system. Having a single virtual interface enables fancy queuing and QoS to be applied to the traffic on the virtual interface (for example, policing and traffic shaping can be applied to the traffic flows). Each individual link to the peer system might be doing some form of fancy queuing, but none of the links knows about the traffic on the other parallel links. Fancy queuing and QoS cannot be applied uniformly to the entire aggregate traffic between the system and its peer system. A single virtual interface also simplifies the task of monitoring traffic to the peer system (for example, traffic statistics are all on one interface). Figure 22-1 Multilink PPP Bundle 132316 Point-to-Point An endpoint discriminator is used to identify the member links of the MLP bundle. Restrictions for MLP Bundles The router supports links equal to T1/E1 or less for MLPPP bundling. You cannot bundle high-speed links (for example, E3) because the router can store only 50 ms of data based on the E1 speed. MLP Bundles and PPP Links MLP works with fully functional Point-to-Point Protocol (PPP) interfaces. An MLP bundle can consist of a PPP over serial link and a PPP over ATM link. As long as each link behaves like a standard serial interface, the mixed links work properly in a bundle. OL-2226-23 Cisco 10000 Series Router Software Configuration Guide 22-3