27-21
Cisco ME 3800X and 3600X Switch Software Configuration Guide
OL-23400-01
Chapter 27 Configuring QoS
Understanding QoS
Figure 27-8
Input and Output Policy Relationship
Table 27-1
Options for Input and Output Policies
Action
Feature
Applicable Level
Input Policy Maps
Classification
Outer VLAN, Inner VLAN, or both
VLAN level.
Outer CoS, Inner CoS, or both, MAC ACLs,
IP ACLs, IPv4 DSCP or Precedence, MPLS
EXP
Match any (only)
Class level.
Match any
Physical level or VLAN level.
Marking
Outer CoS, IPv4 DSCP or Precedence, MPLS
EXP, QoS group or discard class
Multiple marking actions for the same class
Any one level (class, VLAN, or physical)
Policing
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.
Any one level (class, VLAN, or physical)
Output Policy Maps
Classification
Outer VLAN, Inner VLAN, or both
VLAN level
Outer CoS, Inner CoS, or both, MAC ACLs,
IP ACLs, IPv4 DSCP or Precedence, MPLS
EXP
Match any (only)
Class level
Queuing
Tail drop (queue-limit) or weighted tail drop
based on outer CoS, IPv4 DSCP or
precedence, MPLS EXP, QoS group or discard
class
Class level
208742
Classification
Policing
Mark
In profile or
out of profile
Inspect packet,
and process the
match
commands.
Compare received
traffic rate with the
configured policer
and determine if
the packet is in
profile or out of
profile.
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.
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.
Queueing and
scheduling
Traffic received
on a port or
service instance
