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Cisco 10000 Series Router Quality of Service Configuration Guide
OL-7433-09
Chapter 16 Fragmenting and Interleaving Real-Time and Nonreal-Time Packets
Multilink PPP-Based Link Fragmentation and Interleaving
MLP Bundle Interface and Service Policies
The router applies a service policy, attached to a multilink interface, to only the MLP bundle interface.
The QoS actions defined by the service policy are applied to the outbound nonreal-time packets before
the packets reach the bundle first-in first-out (FIFO) queue. The nonreal-time packets are fragmented in
the FIFO queue and then the real-time packets are interleaved between the fragments as the real-time
packets exit their priority queue.
Performance and Scalability for Multi-VC MLP Over ATM-Based LFI
The following list describes how to enhance performance and scalability for Multi-VC MLP over
ATM-based LFI:
•
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
•
Configure the
hold-queue
command in interface configuration mode for all physical interfaces,
except when configuring the ATM OC-12 line card. The OC-12 does not require the
hold-queue
command.
For more information, see the
“Scalability and Performance”
chapter in the
Cisco 10000 Series Router
Broadband Aggregation, Leased-Line, and MPLS Configuration Guide
.
Restrictions and Limitations for Multi-VC MLP Over ATM-Based LFI
•
Multi-VC MLP over ATM member links are restricted to non-aggregated PVCs (for example,
variable bit rate-nonreal-time (VBR-nrt) and constant bit rate (CBR) ATM traffic classes only).
•
Each MLP over ATM member link can be up to 2048 kbps.
•
The router supports a maximum of 10 member links (ATM PVCs) per bundle.
•
The router supports a maximum of 1250 bundles per system and a maximum of 2500 member links
per system.
•
For Cisco IOS Release 12.2(28)SB and later releases, the valid multilink interface values are from
1 to 9999. For Cisco IOS Release 12.2(31)SB2 and later releases, valid values are from 1 to 9999
and 65,536 to 2,147,483,647.
•
All member links in a MLP bundle must have the same encapsulation type and bandwidth.
Performance is not guaranteed when member links have different bandwidths.
•
Interleaving occurs on one member link.
•
MLP VCs cannot be on-demand VCs that are automatically provisioned.
•
Associating MLP over ATM VCs with ATM virtual paths (VPs) is discouraged, though not
prevented.
•
Cisco IOS software supports a maximum of 4096 total virtual template interfaces.
•
We strongly recommend that you use only strict priority queues when configuring Multi-VC MLP
over ATM-based LFI. For more information, see
Chapter 8, “Prioritizing Services.”
