Qos For Ipv6 Acls; Traffic Shaping; Regulation Of Traffic With The Shaping Mechanism - Cisco ASR 9000 Series Configuration Manual

Configuring Modular QoS Congestion Management

QoS for IPv6 ACLs

The Modular Weapon-X line cards support classification of IPv6 properties based on Source IP, Destination
IP, Source Port, Destination Port, Protocol, TOS, Hop Limit, and ACL-based classification.
The supported interfaces are indicated below.
Supported Interface
L3 main interface
L3 sub-interface
L3 bundle-interface/ sub-interface
L2 main interface
L2 sub-interface
L2 bundle-interface/ sub-interface

Traffic Shaping

Traffic shaping allows you to control the traffic flow exiting an interface to match its transmission to the speed
of the remote target interface and ensure that the traffic conforms to policies contracted for it. Traffic adhering
to a particular profile can be shaped to meet downstream requirements, thereby eliminating bottlenecks in
topologies with data-rate mismatches.
To match the rate of transmission of data from the source to the target interface, you can limit the transfer of
data to one of the following:
• A specific configured rate
• A derived rate based on the level of congestion
The rate of transfer depends on these three components that constitute the token bucket: burst size, mean rate,
and time (measurement) interval. The mean rate is equal to the burst size divided by the interval.
When traffic shaping is enabled, the bit rate of the interface does not exceed the mean rate over any integral
multiple of the interval. In other words, during every interval, a maximum of burst size can be sent. Within
the interval, however, the bit rate may be faster than the mean rate at any given time.
When the peak burst size equals 0, the interface sends no more than the burst size every interval, achieving
an average rate no higher than the mean rate. However, when the peak burst size is greater than 0, the interface
can send as many as the burst size plus peak burst bits in a burst, if in a previous time period the maximum
amount was not sent. Whenever less than the burst size is sent during an interval, the remaining number of
bits, up to the peak burst size, can be used to send more than the burst size in a later interval.

Regulation of Traffic with the Shaping Mechanism

When incoming packets arrive at an interface, the packets are classified using a classification technique, such
as an access control list (ACL) or the setting of the IP Precedence bits through the Modular QoS CLI (MQC).
Cisco ASR 9000 Series Aggregation Services Router Modular Quality of Service Configuration Guide, Release 6.1.x
Ethernet Linecard
yes
yes
yes
no
no
no
QoS for IPv6 ACLs
Enhanced Ethernet Linecard
yes
yes
yes
yes
yes
yes
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