Cisco 10000 Series User Manual

18-20
Cisco 10000 Series Router Quality of Service Configuration Guide
OL-7433-09
Chapter 18 Regulating and Shaping Subscriber Traffic
MQC Support for IP Sessions
• When you remove a policy from the parent interface, one of the following actions occurs:
– The policy is removed from a subinterface and is uninherited from any sessions on the
subinterface that inherited the policy from it. If the main interface has a policy, sessions on the
subinterface from which the policy was removed inherit that.
– The policy is removed from the main interface and is uninherited from the main interface and
also from any sessions under its subinterfaces that inherited this policy.
• When a session without a policy receives one from the RADIUS server, you only need to install the
new policy. However, when a session with an inherited policy from the parent receives a new policy
from the RADIUS server, you must first uninherit the parent policy and then install the new one.
• When a session policy is removed, the session inherits the policy from its nearest parent,
subinterface, or main interface that has a policy.
Service Policy Maps and Service Profiles
An Intelligent Service Gateway (ISG) service is a collection of policies that may be applied to a
subscriber session. Services are defined in service policy maps and service profiles.
Service policy maps and service profiles contain a collection of traffic policies and other functionality.
Traffic policies determine which functionality is applied to which session traffic. A service policy map
or service profile may also contain a network-forwarding policy, a specific type of traffic policy that
determines how session data packets are forwarded to the network.
Service policy maps and service profiles serve the same purpose; the only difference between them is
that a service policy map is defined on the local device using the policy-map type service command,
and a service profile is configured on an external device, such as an authentication, authorization, and
accounting (AAA) server (for example, RADIUS).
Restrictions and Limitations for MQC Support for IP Sessions
• Interface redundancy is not supported on the Cisco 10000 series router.
• IP session QoS and PPP session QoS are two separate features. IP session QoS does not include PPP
session QoS.
• IP sessions over ATM VCs do not support queuing policy maps.
• Only the marking and policing features work in upstream traffic. All queuing, policing, and marking
MQC features work in downstream traffic.
• The behavior of session and interface oversubscription for the PRE2 and PRE3 is unchanged from
the usual QoS oversubscription behavior on the PRE2 and PRE3.
• IP sessions over Gigabit EtherChannel (GEC) is not supported.
• The PRE2 does not support three-level hierarchical MQC policies. Therefore, MQC policies applied
to IP sessions on PRE2-based routers must conform to this PRE2 limitation. For example, a shaping
policy that is applied to a session can have just two levels, where one level has all class queues and
the next level is the default queue that does aggregate shaping.
• The PRE3 supports three levels of hierarchies. Any limitations of PRE3 hierarchies also apply to the
MQC policies on IP sessions.
• The router cannot map IP sessions to an interface. However, the router can map LNS and LAC
sessions to an interface.

Cisco 10000 Series Specifications

General

Brand	Cisco
Model	10000 Series
Category	Network Router
Language	English