Chapter 10
| Quality of Service
Creating QoS Policies
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which are green, yellow, or red. Refer to RFC 2698 for more information on
other aspects of trTCM.
Command Usage
◆ A policy map can contain 128 class statements that can be applied to the same
interface (page 241). Up to 32 policy maps can be configured for ingress ports.
◆ After using the policy map to define packet classification, service tagging, and
bandwidth policing, it must be assigned to a specific interface by a service
policy (page 241) to take effect.
Parameters
These parameters are displayed:
Add
◆ Policy Name – Name of policy map. (Range: 1-32 characters)
◆ Description – A brief description of a policy map. (Range: 1-64 characters)
Add Rule
◆ Policy Name – Name of policy map.
◆ Class Name – Name of a class map that defines a traffic classification upon
which a policy can act.
◆ Action – This attribute is used to set an internal QoS value in hardware for
matching packets. The PHB label is composed of five bits, three bits for per-hop
behavior, and two bits for the color scheme used to control queue congestion
with the srTCM and trTCM metering functions.
■
Set CoS – Configures the service provided to ingress traffic by setting an
internal CoS value for a matching packet (as specified in rule settings for a
class map). (Range: 0-7)
See Table 17, “Default Mapping of CoS/CFI to Internal PHB/Drop
Precedence,” on page 224).
■
PHB – Per-hop behavior, or the priority used for this router hop.
(Range: 0-7)
■
Drop Precedence – Drop precedence used in controlling traffic
congestion. (Range: 0 - Green, 3 - Yellow, 1 - Red)
■
Set PHB – Configures the service provided to ingress traffic by setting the
internal per-hop behavior for a matching packet (as specified in rule
settings for a class map). (Range: 0-7)
See Table 16, “Default Mapping of DSCP Values to Internal PHB/Drop
Values,” on page 222).
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