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Catalyst 6500 Series Switch Cisco IOS Software Configuration Guide—Release 12.1 E
78-14099-04
Chapter 31 Configuring PFC QoS
Configuring PFC QoS
Configuring a Per-Interface Policer
To configure a per-interface policer (see the “Policers” section on page 31-19), perform this task:
When configuring a per-interface policer, note the following:
• Policing uses the Layer 3 packet size.
• See the “PFC QoS Configuration Guidelines and Restrictions” section on page 31-31 for
information about rate and burst size granularity.
• You can enter the flow keyword to define a microflow policer. During microflow policing, the
following occurs:
–
PFC QoS considers IPX traffic with same source network, destination network, and destination
node to be part of the same flow, including traffic with different source nodes or sockets.
–
PFC QoS considers MAC-Layer traffic with the same protocol and the same source and
destination MAC-Layer addresses to be part of the same flow, including traffic with different
ethertypes.
–
Microflow policers do not support the maximum_burst_bytes parameter, the
pir bits_per_second keyword and parameter, or the violate-action keyword.
• The valid range of values for the CIR bits_per_second parameter is as follows:
–
Minimum—32 kilobits per second, entered as 32000
–
Maximum—4 gigabits per second, entered as 4000000000
• The normal_burst_bytes parameter sets the CIR token bucket size.
• The maximum_burst_bytes parameter sets the PIR token bucket size (not supported with the flow
keyword)
• When configuring the size of a token bucket, note the following:
–
The minimum token bucket size is 1 kilobyte, entered as 1000 (the maximum_burst_bytes
parameter must be set larger than the normal_burst_bytes parameter)
–
The maximum token bucket size is approximately 32 megabytes, entered as 31250000
–
To sustain a specific rate, set the token bucket size to be at least the rate value divided by 4000,
because tokens are removed from the bucket every 1/4000th of a second (0.25 ms).
Command Purpose
Router(config-pmap-c)# police [flow] bits_per_second
normal_burst_bytes [maximum_burst_bytes] [pir
1
peak_rate_bps] [[[conform-action {drop |
set-dscp-transmit
2
dscp_value | set-prec-transmit
2
ip_precedence_value | transmit}] exceed-action {drop
| policed-dscp | transmit}] violate-action
1
{drop |
policed-dscp | transmit}]
1. Supported only with PFC2. Not supported in microflow policers (the flow keyword configures a microflow policer).
2. With PFC2, the set-dscp-transmit and set-prec-transmit keywords are only supported for IP traffic.
Creates a per-interface policer and configures the policy map
class to use it.
Router(config-pmap-c)# no police [flow]
bits_per_second normal_burst_bytes
[maximum_burst_bytes] [pir peak_rate_bps]
[[[conform-action {drop | set-dscp-transmit
dscp_value | set-prec-transmit ip_precedence_value |
transmit}] exceed-action {drop | policed-dscp |
transmit}] violate-action {drop | policed-dscp |
transmit}]
Deletes the per-interface policer from the policy map class.
