Types Of Hierarchical Policies; Nested Hierarchical Policies - Cisco 10000 Series Configuration Manual

Types of Hierarchical Policies

Types of Hierarchical Policies
The Cisco 10000 series router supports the following types of hierarchical policies:
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Nested Hierarchical Policies

A nested hierarchical policy is a queuing model that defines a minimum bandwidth for multiple classes
and specifies a combined maximum bandwidth for the classes. Using a nested hierarchical policy, you
can shape two or more queues together into one logical QoS policy. In this way, you can associate
multiple logical links with a physical interface and enable the router to service any group of queues
independently of other queues. The router provides distinct dequeuing rates to the subsets of the queues
on a physical link.
Figure 13-1
Relay. The network interface has two PVCs (PVC1 and PVC2), each with a multiqueue shape rate of
768 kbps. Each PVC has two fair queues whose aggregate output is shaped at 768 kbps.
Figure 13-1 Nested Hierarchical Policy on Frame Relay
PVC1 shaped at 768 Kbps
Fair Queue at 512 Kbps
Cisco 10000 Series Router Quality of Service Configuration Guide
13-6
Nested Hierarchical Policies, page 13-6
Defines up to two levels of hierarchy. A nested policy can define a minimum bandwidth for each
type of traffic on a virtual circuit and a maximum bandwidth for the virtual circuit's total traffic.
However, a nested policy cannot actively police a subclass of each guaranteed class while placing a
maximum transmission limit on the aggregate traffic.
Three-Level Hierarchical Policies, page 13-8
Defines up to three levels of hierarchy. A three-level policy can define a minimum bandwidth for
each traffic type on a virtual circuit, define a maximum bandwidth for the virtual circuit's total
traffic, police a subclass of each guaranteed class, and place a maximum transmission limit on the
aggregate traffic.
Hierarchical Input Policing Policies, page 13-10
Defines up to two levels of hierarchy for inbound traffic only. A hierarchical input policing policy
can define two levels of policing, one in the parent policy and one in the child policy. The top-level
parent policy is typically used to police an interface, subinterface, ATM VC, Frame Relay DLCI, or
802.1Q VLAN, and is applied to all traffic.
shows a sample queuing configuration on a T1 network interface that is running Frame
Fair Queue at 512 Kbps
T1
PVC2 shaped at 768 Kbps
Fair Queue at 512 Kbps
Chapter 13 Defining QoS for Multiple Policy Levels
Fair Queue at 512 Kbps
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