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Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 22 Configuring Multilink Point-to-Point Protocol Connections
Multi-VC MLP over ATM Virtual Circuits
For more information about link fragmentation and interleaving, see the “Fragmenting and Interleaving
Real-Time and Nonreal-Time Packets” chapter in the Cisco 10000 Series Router Quality of Service
Configuration Guide.
Performance and Scalability for Multi-VC MLP over ATM VCs
• Configure the hold-queue command in interface configuration mode for all physical interfaces,
except when configuring the OC-12 ATM line card. The 1-Port OC-12 ATM line card does not
require the hold-queue command. For example:
Router(config-if)# hold-queue 4096 in
• Configure the following commands and recommended values on the virtual template interface:
–
ppp max-configure 110
–
ppp max-failure 100
–
ppp timeout retry 5
–
keepalive 30
For example:
Router(config-if)# ppp max-configure 110
Router(config-if)# ppp max-failure 100
Router(config-if)# ppp timeout retry 5
Router(config-if)# keepalive 30
For more information, see the “Scalability and Performance” chapter in this guide.
Restrictions and Limitations for Multi-VC MLP over ATM VCs
• A maximum of 10 member links is supported per bundle.
• MLP over ATM member links are restricted to nonaggregated PVCs (for example, variable bit
rate-nonreal-time [VBR-nrt] and constant bit rate [CBR] ATM traffic classes only).
• The router supports a maximum of 1250 bundles per system and 2500 member links per system.
• Each member link can have a bandwidth rate up to 2048 kbps.
• The router only supports member links with the same encapsulation type.
• The valid multilink interface ranges are from 1 to 9999 (Release 12.2(28)SB and later) and from 1
to 9999 and 65,536 to 2,147,483,647 (Release 12.2(31)SB2 and later). For example:
Router(config)# interface multilink 8
• MLP PVCs cannot be on-demand VCs that are automatically provisioned.
• Associating MLP over ATM PVCs with ATM virtual paths (VPs) is discouraged, though not
prevented.
• Cisco IOS software supports a maximum of 4096 total virtual template interfaces.
• You cannot manually configure the bandwidth on a bundle interface using the bandwidth command.
• You cannot apply a virtual template with MLP configured to an MLP bundle.
• If a virtual template attached to a member link specifies a bandwidth, the router does not clone the
specified bandwidth to the MLP bundle and the member links.