Cisco 10000 Series User Manual

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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
FRF.12 Fragmentation
Note The Cisco 10000 series router does not require that you configure priority (low-latency) queuing to use
interface-based fragmentation. However, the purpose of LFI is to reduce delay for priority traffic;
therefore, the benefit of LFI is realized when you do configure priority queuing. The class of
delay-sensitive traffic is mapped through a service policy to the priority queue.
Restrictions and Limitations for FRF.12 Fragmentation
PVC-Based Fragmentation
• Fragmentation is performed after frames are removed from the bundle.
• The frame-relay route command does not support fragmentation.
• The show frame-relay fragment command does not provide information about the number of
fragments received, dropped, and transmitted.
• The show frame-relay fragment interface command does not provide information about the
number of:
– Fragmented packets and bytes received
– Packets dropped while being reassembled
– Received packets in timeouts
– Interleaved packets transmitted
– Fragmented packets and bytes transmitted
– Fragmented packets dropped when transmitted
• We strongly recommend that you use only strict priority queues when configuring PVC-based
FRF.12 fragmentation. For more information, see
Chapter 8, “Prioritizing Services.”
Interface-Based Fragmentation
• PVC-based and interface-based fragmentation cannot be configured at the same time.
• The rate of the interface or subinterface must be between 64 and 2048 kbps.
• Interface fragmentation and Frame Relay traffic shaping cannot be configured at the same time on
an interface. Do not configure the frame-relay traffic-shaping command on an interface with
Frame Relay interface fragmentation configured.
• The frame-relay fair-dlci queuing command cannot be configured on an interface with Frame
Relay interface fragmentation configured. To specify QoS on FRF.12-enabled interfaces, use service
policies (see
Chapter 13, “Defining QoS for Multiple Policy Levels.”).
• Local Management Interface (LMI) traffic is not fragmented.
• We strongly recommend that you use only strict priority queues when configuring interface-based
FRF.12 fragmentation. For more information, see
Chapter 8, “Prioritizing Services.”

Cisco 10000 Series Specifications

General

Brand	Cisco
Model	10000 Series
Category	Network Router
Language	English