Feature History For Class-Based Traffic Shaping; System Limits For Class-Based Shaping; Restrictions And Limitations For Class-Based Shaping; Hierarchical Shaping - Cisco 10000 Series Configuration Manual

Traffic Shaping

Feature History for Class-Based Traffic Shaping

Cisco IOS Release
Release 12.0(25)SX
Release 12.2(16)BX
Release 12.2(28)SB
Release 12.2(31)SB2

System Limits for Class-Based Shaping

Table 3-1 on page 3-2

Restrictions and Limitations for Class-Based Shaping

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Hierarchical Shaping

Hierarchical shaping provides two levels of shaping—per-VC ATM-level shaping and per-VC
packet-level shaping—and provides per-VC and per-VP traffic shaping to control or modify the flow of
traffic on an interface. Traffic shaping limits throughput by buffering excess traffic instead of dropping
packets. The shaping function also ensures that traffic from one VC does not adversely impact another
VC, resulting in loss of data.
The Cisco 10000 series router supports hierarchical shaping for the following ATM line cards:
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•
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The router supports hierarchical shaping when operating as a Layer 2 Access Concentrator (LAC) and
in the following modes:
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•
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Hierarchical shaping does not require that you configure policy maps. You can use hierarchical shaping
with non-queuing related policy maps configured in a virtual template or configured directly on the VC.
Apply queuing-related policy maps directly to the VC.
Cisco 10000 Series Router Quality of Service Configuration Guide
9-4
Description
The Class-Based Traffic Shaping feature was introduced
on the router.
This feature was introduced on the PRE2.
This feature was integrated in Cisco IOS
Release 12.2(28)SB for the PRE2.
This feature was introduced on the PRE3.
lists the system limits for policy maps supported on the Cisco 10000 series router.
A single policy map can be attached to multiple interfaces concurrently. If you attempt to attach a
policy map to an interface when the sum of the bandwidth assigned to classes is greater than 99
percent of the available bandwidth, the router logs a warning message and does not allocate the
requested bandwidth to all of the classes. If the policy map is already attached to other interfaces, it
is removed from them.
Whenever you modify a class policy in an attached policy map, class-based weighted fair queuing
(CBWFQ) is notified and the new classes are installed as part of the policy map in the CBWFQ
system.
OC-12
4-port OC-3
8-port E3/DS3
PPP termination and aggregation (PTA)
Router bridge encapsulation (RBE)
RFC 1483
Chapter 9 Shaping Traffic
Required PRE
PRE1
PRE2
PRE2
PRE3
OL-7433-09