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Chapter 22
Configuring Multilink Point-to-Point Protocol Connections
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Single-VC MLP over ATM Virtual Circuits
The Single-VC MLP over ATM virtual circuits (VCs) feature enhances the MLP over Serial interfaces
feature by enabling you to configure multilink Point-to-Point Protocol (MLP) on an ATM VC. By doing
so, you can aggregate multiple data paths (for example, PPP over ATM encapsulated ATM VCs) into a
single logical connection called an MLP bundle (see the
MLP bundle can have only one member link.
MLP supports link fragmentation and interleaving (LFI). When enabled, the MLP fragmentation
mechanism multilink encapsulates large nonreal-time packets and fragments them into a small enough
size to satisfy the delay requirements of real-time traffic. The smaller real-time packets remain intact and
MLP sends the packets to a special transmit queue, allowing the packets to be sent earlier than other
packet flows. The MLP interleaving mechanism sends the real-time packets between the fragments of
the nonreal-time packets. 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 Single-VC MLP over ATM
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For more information, see the "Scalability and Performance" chapter in this guide.
Restrictions and Limitations for Single-VC MLP over ATM
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You cannot apply a virtual template with MLP configured to an MLP bundle.
We strongly recommend that you use only strict priority queues when configuring MLP over
Serial-based LFI. For more information, see the "Prioritizing Services" chapter in the
Series Router Quality of Service Configuration
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
Only one member link is supported per bundle.
Single-VC 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).
Single-VC MLP over ATM Virtual Circuits
Guide.
"MLP Bundles" section on page
Cisco 10000 Series Router Software Configuration Guide
Cisco 10000
22-3). The
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Troubleshooting
