Cisco 10000 - Manual (Page 434)

19-16
Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 19 Configuring Multilink Point-to-Point Protocol Connections
Multi-VC MLP over ATM Virtual Circuits
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 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.