Cisco Cisco IOS Software Release 12.2(14)S

This document describes the Frame Relay Queueing and Fragmentation at the Interface feature in 
Cisco IOS Release 12.2(14)S and includes the following sections:

The Frame Relay Queueing and Fragmentation at the Interface feature introduces support for 
low-latency queueing (LLQ) and FRF.12 end-to-end fragmentation on a Frame Relay interface. This new 
feature simplifies the configuration of low-latency, low-jitter quality of service (QoS) by enabling the 
queueing policy and fragmentation configured on the main interface to apply to all permanent virtual 
circuits (PVCs) and subinterfaces under that interface. Before the introduction of this feature, queueing 
and fragmentation had to be configured on each individual PVC. Subrate shaping can also be configured 
on the interface. 

When FRF.12 end-to-end fragmentation is enabled on an interface, all PVCs on the main interface and 
its subinterfaces will have fragmentation enabled with the same configured fragment size. To maintain 
low latency and low jitter for higher priority traffic, the configured fragment size must be greater than 

12.2(14)S

This feature was introduced.