Cisco Cisco IOS Software Release 12.2(14)S
1
Cisco IOS Release 12.2(14)S
Frame Relay Queueing and Fragmentation
at the Interface
at the Interface
Feature History
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:
Cisco IOS Release 12.2(14)S and includes the following sections:
•
•
•
•
•
•
•
•
Feature Overview
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.
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.
How Frame Relay Queueing and Fragmentation at the Interface Works
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
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
Release
Modification
12.2(14)S
This feature was introduced.