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Random Early Detection – RED starts dropping yellow and red packets when the
buffer fills up to a moderately high level, and then starts dropping any packets
regardless of color when the buffer fills up to a very high level.
Command Usage
◆
A policy map can contain 512 class statements that can be applied to the same
interface
(page
239). 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
239) 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: 1-256 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 16, "Default Mapping of CoS/CFI to Internal PHB/Drop
Precedence, " on page
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 15, "Default Mapping of DSCP Values to Internal PHB/Drop
Values, " on page
■
Set IP DSCP – Configures the service provided to ingress traffic by setting
an IP DSCP value for a matching packet (as specified in rule settings for a
class map). (Range: 0-63)
222).
220).
– 233 –
Chapter 10
| Quality of Service
Creating QoS Policies
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