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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
Link Fragmentation and Interleaving
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MLP over Frame Relay-based LFI—Uses the fragmentation and interleaving capability of MLP to
transport real-time traffic (for example, voice) and nonreal-time traffic (for example, data transfers)
together on low-speed Frame Relay permanent virtual circuits (PVCs) without causing excessive
delay to the real-time traffic. MLP uses the fragmentation and packet sequencing specifications
defined in RFC 1990 to implement link fragmentation and interleaving at the bundle level.
MLP over Frame Relay-based LFI supports only one member link per MLP bundle and the link is
LFI-enabled.
•
FRF.12 Fragmentation—Uses Frame Relay Forum FRF.12-based fragmentation on Frame Relay
permanent virtual circuits (PVCs) to allow long, nonreal-time data packets to be broken into smaller
fragments and shorter real-time packets to be interleaved between the fragments. In this way,
real-time and nonreal-time packets can be carried together on low-speed links without causing
excessive delay to the real-time traffic. The real-time packets remain intact and are less likely to
experience long queuing delays.
Feature History for Link Fragmentation and Interleaving
Cisco IOS Release
Description
Required PRE
Release 12.0(23)SX
The PVC-based FRF.12 Fragmentation feature and the
MLP over Serial-based LFI feature were introduced on the
router.
PRE1
Release 12.0(27)S
The FRF.12 Fragmentation feature was enhanced to enable
interface-based FRF.12 fragmentation.
PRE1
Release 12.2(27)SBB
The following features were introduced on the PRE2: MLP
over Serial-based LFI, MLP over Frame Relay-based LFI,
Single-VC and Multi-VC MLP over ATM-based LFI, and
PVC-based and Interface-based FRF.12 Fragmentation.
PRE2
Release 12.2(31)SB2
The following features were introduced on the PRE3: MLP
over Serial-based LFI, MLP over Frame Relay-based LFI,
Single-VC and Multi-VC MLP over ATM-based LFI, and
PVC-based and Interface-based FRF.12 Fragmentation.
PRE3
