Platform Hardware Capabilities - Cisco Catalyst 4500 series Administration Manual

Chapter 42 Configuring Quality of Service
Supported classification actions
police
police (percent)
police (two rates)
set cos
set dscp
set precedence
set qos-group
table map support
priority
shape
bandwidth
dbl
queue-limit

Platform Hardware Capabilities

Qos Actions
Classification
Policing
Marking
Queuing
DBL
Prerequisites for Applying a QoS Service Policy
Unlike the Switch QoS model, there is no prerequisite for enabling QoS on various targets. Just the
attachment of a service policy enables QoS and detachment of that policy disables QoS on that target.
OL_28731-01
Configuring QoS on a Standalone Supervisor Engine 6-E/6L-E or Supervisor Engine 7-E/7L-E/8-E
Descriptions
Configures traffic policing.
Configures traffic policing on the basis of a percentage of bandwidth available on an
interface.
Configures traffic policing using two rates, the committed information rate (CIR) and
the peak information rate (PIR).
Sets the Layer 2 class of service (CoS) value of an outgoing packet.
Marks a packet by setting the differentiated services code point (DSCP) value in the
type of service (ToS) byte of IPv4 or traffic class byte of IPv6 packet.
Sets the precedence value in the packet header.
Sets a QoS group identifier (ID) that can be used later to classify packets.
Unconditional marking of one packet field based on another packet field.
Gives priority to a class of traffic belonging to a policy map.
Shapes traffic to the indicated bit rate according to the algorithm specified.
Provides a guaranteed minimum bandwidth to each of the eight queues.
Dynamic buffer limit.
Specifies the maximum number of packets a transmit queue can hold.
Numbers of entries supported
64k input and 64k output classification entries are supported.
A given policy can use at most 24k ACLs
16K policers are supported. Policers are allocated to given direction in blocks of 2k.
For example, 2k policers can be used in for input and 14k policers can be used for
output. Single rate policers uses one policer entry. Single Rate Three Color Marker
(srTCM) (RFC 2697) and Two Rate Three Color Marker (trTCM) (RFC 2698) uses
two policer entries
Marking of Cos and DSCP/Precedence is supported through two marking tables, each
capable of supporting 512 entries. There are separate tables for each direction.
The queue size is Configurable with the maximum number of entries configurable per
port depending on the chassis and line card type.
You can enable DBL action on all configured class-maps.
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
42-49