Input Policy Maps; Output Policy Maps - Cisco 3845 - Security Bundle Router Software Manual

Chapter 27 Configuring QoS
Figure 27-8 Input and Output Policy Relationship
Traffic received
on a port or
service instance
Classification
Inspect packet,
and process the
match
commands.
Table 27-1 Options for Input and Output Policies
Action

Input Policy Maps

Classification
Marking
Policing

Output Policy Maps

Classification
Queuing
OL-23400-01
Policing
Compare received
traffic rate with the
configured policer
and determine if
the packet is in
profile or out of
profile.
Feature
Outer VLAN, Inner VLAN, or both
Outer CoS, Inner CoS, or both, MAC ACLs,
IP ACLs, IPv4 DSCP or Precedence, MPLS
EXP
Match any (only)
Match any
Outer CoS, IPv4 DSCP or Precedence, MPLS
EXP, QoS group or discard class
Multiple marking actions for the same class
1 rate, 2 color
2 rate, 3 color
Conditional marking: Outer CoS, IPv4 DSCP
or Precedence, MPLS EXP, QoS group or
discard class
Multiple conditional marking actions.
Outer VLAN, Inner VLAN, or both
Outer CoS, Inner CoS, or both, MAC ACLs,
IP ACLs, IPv4 DSCP or Precedence, MPLS
EXP
Match any (only)
Tail drop (queue-limit) or weighted tail drop
based on outer CoS, IPv4 DSCP or
precedence, MPLS EXP, QoS group or discard
class
In profile or
out of profile
Mark
Based on whether
the packet is in or
out of profile and
the configured
parameters,
determine whether
to pass through,
mark down, or
drop the packet.
Applicable Level
VLAN level.
Class level.
Physical level or VLAN level.
Any one level (class, VLAN, or physical)
Any one level (class, VLAN, or physical)
VLAN level
Class level
Class level
Cisco ME 3800X and 3600X Switch Software Configuration Guide
Understanding QoS
Queueing and
scheduling
Based on the
hierarchical QoS
configuration,
create queues for
classes, VLANs,
and physical
interfaces. Place
the packet into the
queue and service
it according to the
configuration.
27-21