Lenovo TB-8504F User Manual
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Multilink PPP Support for the Cisco ASR 1000
Series Routers
First Published: October 2012
Last Updated: December 5, 2016
Multilink Point-to-Point Protocol (MLP) provides support to aggregate the bandwidth of low-speed
WAN and broadband links into a single entity, referred to as a bundle interface. A bundle interface is a
logical entity that provides a single point in which other features (for example, Quality of Service [QoS])
can be attached. MLP provides incremental bandwidth on demand, by adding additional links to the
bundle, as needed. MLP also enables interleaving of latency-sensitive priority traffic with fragmented
nonpriority traffic using link fragmentation and interleaving (LFI).
Member links that are a part of an MLP bundle can be bundled across ports on:
•
•
•
The Cisco IOS XE software supports MLP links for serial (T1, E1, NxDS0) and broadband topologies
such as Multilink PPP over ATM (MLPoA), Multilink PPP over Ethernet (MLPoE), Multilink PPP over
Ethernet over ATM (MLPoEoA), and Multilink PPP over LNS (MLPoLNS). Additionally, the Cisco IOS
XE software allows the device to operate as an L2TP Access Concentrator (LAC), L2TP Network Server
(LNS), or PPP Termination and Aggregation (PTA) device.
This document describes the features, limitations, and scaling of MLP on the Cisco ASR 1000 Series
Aggregation Services Routers running the Cisco IOS XE software. For information about the
configuration and operation of MLP in the Cisco IOS XE software, see the "Configuring Multilink PPP
Connections" chapter in the
Release 3S (Cisco ASR
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest
information about features and caveats, see the release notes for your platform and software release. To
find information about the features documented in this module, and to see a list of the releases in which each
feature is supported, see the
1000 Series Routers? section on page
OL-16506-17
The same shared port adapter (SPA)
Different SPAs on the same SPA interface processor (SIP)
Different SPAs on different SIPs
Wide-Area Networking Configuration Guide: Multilink PPP, Cisco IOS XE
1000).
?$paranum>Feature Information for Multilink PPP Support for Cisco ASR
Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide
C H A P T E R
11-18.
11
11-1
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Summary of Contents for Lenovo TB-8504F
- Page 1 C H A P T E R Multilink PPP Support for the Cisco ASR 1000 Series Routers First Published: October 2012 Last Updated: December 5, 2016 Multilink Point-to-Point Protocol (MLP) provides support to aggregate the bandwidth of low-speed WAN and broadband links into a single entity, referred to as a bundle interface. A bundle interface is a logical entity that provides a single point in which other features (for example, Quality of Service [QoS]) can be attached.
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Page 2: Table Of Contents
Chapter 11 Multilink PPP Support for the Cisco ASR 1000 Series Routers Contents Use the Cisco Feature Navigator to find information about platform support and Cisco IOS and Cisco IOS XE operating system software image support. To access the Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. -
Page 3: Cisco Ios Xe Scaling Limits For Mlp Bundles
Chapter 11 Multilink PPP Support for the Cisco ASR 1000 Series Routers Cisco IOS XE Scaling Limits for MLP Bundles Cisco IOS XE Scaling Limits for MLP Bundles This section lists the scaling limits for MLP bundles in different releases of Cisco IOS XE, in which scaling limits were either introduced or enhanced. - Page 4 Chapter 11 Multilink PPP Support for the Cisco ASR 1000 Series Routers Cisco IOS XE Scaling Limits for MLP Bundles Table 11-1 shows the maximum scale numbers for various MLP functionalities on the Cisco ASR 1000 Series Aggregation Services Routers. Table 11-1 MLP Features and Maximum Scale Numbers Maximum...
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Page 5: Restrictions For Mlp Over Serial Interfaces
Chapter 11 Multilink PPP Support for the Cisco ASR 1000 Series Routers Cisco IOS XE Scaling Limits for MLP Bundles Restrictions for MLP over Serial Interfaces The following restrictions apply to MLP over Serial Interfaces: The MLP over Serial Interfaces feature supports a maximum of ten member links per bundle. The •... - Page 6 Chapter 11 Multilink PPP Support for the Cisco ASR 1000 Series Routers Cisco IOS XE Scaling Limits for MLP Bundles If the DSLAM between the CPE and PTA communicates the link rate through the PPPoE • dsl-sync-rate tags (Actual Data-Rate Downstream [0x82/130d] tag), the PTA device passes this data to the RADIUS server, but the Cisco ASR 1000 Series Aggregation Services Routers do not act upon it.
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Page 7: Restrictions For Mlp Over Atm At Pta And Lac
Chapter 11 Multilink PPP Support for the Cisco ASR 1000 Series Routers Cisco IOS XE Scaling Limits for MLP Bundles Restrictions for MLP over ATM at PTA and LAC The following restrictions apply to MLP over ATM at PTA and LAC: ATM Autosense is supported to allow the dynamic selection of MLPoA or MLPoEoA. -
Page 8: Information About Multilink Ppp Support For Cisco Asr 1000 Series Routers
Chapter 11 Multilink PPP Support for the Cisco ASR 1000 Series Routers Information About Multilink PPP Support for Cisco ASR 1000 Series Routers over and begin affecting packet buffering on other MLP bundles. (The MLP lost-fragment timeout can be configured on the multilink virtual template interface using the ppp timeout multilink lost-fragment (seconds) (milliseconds) configuration command). -
Page 9: Quality Of Service
Chapter 11 Multilink PPP Support for the Cisco ASR 1000 Series Routers Information About Multilink PPP Support for Cisco ASR 1000 Series Routers Downstream LFI, page 11-13 • IP Type of Service Reflect, page 11-15 • IP Tunnel Marking, page 11-15 •... - Page 10 Chapter 11 Multilink PPP Support for the Cisco ASR 1000 Series Routers Information About Multilink PPP Support for Cisco ASR 1000 Series Routers When packets transit the MLP transmit path, they are subject to two separate stages of queuing. The •...
- Page 11 Chapter 11 Multilink PPP Support for the Cisco ASR 1000 Series Routers Information About Multilink PPP Support for Cisco ASR 1000 Series Routers shape [average | peak] mean-rate [burst-size] [excess-burst-size] account {{{qinq | dot1q} {aal5 | aal3} {subscriber-encapsulation}} | {user-defined offset [atm]}} This command enables you to include the additional overhead added by a SPA using the user-defined option.
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Page 12: Bandwidth
Chapter 11 Multilink PPP Support for the Cisco ASR 1000 Series Routers Information About Multilink PPP Support for Cisco ASR 1000 Series Routers Bandwidth The interface-level bandwidth command must not be used to define the bandwidth at the bundle level on the virtual template interface or the multilink interface. -
Page 13: Downstream Lfi
Chapter 11 Multilink PPP Support for the Cisco ASR 1000 Series Routers Information About Multilink PPP Support for Cisco ASR 1000 Series Routers Downstream LFI Although LFI is thought of as a single feature, it is actually two independent features within MLP. MLP link fragmentation allows larger packets to be Layer 2 fragmented by MLP, and the fragments to be distributed across the various member links in the MLP bundle. - Page 14 Chapter 11 Multilink PPP Support for the Cisco ASR 1000 Series Routers Information About Multilink PPP Support for Cisco ASR 1000 Series Routers here, you must also define a QoS policy with one or more priority classes, and attach the QoS to this interface using the service-policy output policy-map name command.
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Page 15: Ip Type Of Service Reflect
Chapter 11 Multilink PPP Support for the Cisco ASR 1000 Series Routers Information About Multilink PPP Support for Cisco ASR 1000 Series Routers In the legacy model, there were many instances when fragmentation was enabled by default without users being aware that it was configured. In addition, packets of moderate length could be fragmented. This did not provide the expected throughput on the bundle due to the added packet Layer 2 overhead introduced by MLP fragmentation. -
Page 16: Unsupported Features
Chapter 11 Multilink PPP Support for the Cisco ASR 1000 Series Routers Additional References set dscp tunnel xx • set prec tunnel xx • police set-dscp-tunnel-transmit xx • police set-prec-tunnel-transmit xx • The following example shows how to set the ToS value using the police set-prec-tunnel-transmit option: policy-map ppp class class-default... - Page 17 Chapter 11 Multilink PPP Support for the Cisco ASR 1000 Series Routers Additional References Related Topic Document Title PPP commands Cisco IOS Dial Technologies Command Reference Broadband Configuration Cisco IOS XE Broadband and DSL Configuration Guide Cisco IOS Configuration Fundamentals Cisco IOS Configuration Fundamentals Command Reference Standards Standard...
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Page 18: Feature Information For Multilink Ppp Support For Cisco Asr 1000 Series Routers
Chapter 11 Multilink PPP Support for the Cisco ASR 1000 Series Routers Feature Information for Multilink PPP Support for Cisco ASR 1000 Series Routers Technical Assistance Description Link The Cisco Support website provides extensive online resources, http://www.cisco.com/cisco/web/support/index.html including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. - Page 19 Chapter 11 Multilink PPP Support for the Cisco ASR 1000 Series Routers Feature Information for Multilink PPP Support for Cisco ASR 1000 Series Routers Table 11-2 Feature Information for Multilink PPP Support for Cisco ASR 1000 Series Routers Feature Name Releases Feature Information MLPoLNS Model F and IP...
- Page 20 Chapter 11 Multilink PPP Support for the Cisco ASR 1000 Series Routers Feature Information for Multilink PPP Support for Cisco ASR 1000 Series Routers Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide 11-20 OL-16506-17...