31-36
Catalyst 6500 Series Switch Cisco IOS Software Configuration Guide—Release 12.1 E
78-14099-04
Chapter 31 Configuring PFC QoS
Configuring PFC QoS
The maximum_burst_bytes parameter is supported with PFC2. The maximum_burst_bytes
parameter is not supported with PFC, but can be entered with a value equal to the
normal_burst_bytes parameter.
• The valid range of values for the pir bits_per_second parameter is as follows:
–
Minimum—32 kilobits per second, entered as 32000 (the value cannot be smaller than the
CIR bits_per_second parameters)
–
Maximum—4 gigabits per second, entered as 4000000000
The pir bits_per_second parameter is supported with the PFC2. The pir bits_per_second parameter
is not supported with the PFC1 but can be entered with the PFC1 if the value is equal to the CIR
bits_per_second parameter.
• (Optional) You can specify a conform action for matched in-profile traffic as follows:
–
The default conform action is transmit, which sets the policy map class trust state to trust
DSCP unless the policy map class contains a trust command (see the “Policy Maps” section on
page 31-18 and the “Configuring Policy Map Class Actions” section on page 31-44).
–
To set PFC QoS labels in untrusted traffic, enter the set-dscp-transmit keyword to mark
matched untrusted traffic with a new DSCP value or enter the set-prec-transmit keyword to
mark matched untrusted traffic with a new IP precedence value (with the PFC2, the
set-dscp-transmit and set-prec-transmit keywords are only supported for IP traffic). PFC QoS
sets egress ToS and CoS from the configured value.
–
Enter the drop keyword to drop all matched traffic.
Note When you configure drop as the conform action, PFC QoS configures drop as the exceed
action and the violate action.
• (Optional) For traffic that exceeds the CIR, you can specify an exceed action as follows:
–
The default exceed action is drop, except with a maximum_burst_bytes parameter (drop is not
supported with a maximum_burst_bytes parameter).
Note When the exceed action is drop, PFC QoS ignores any configured violate action.
–
Enter the policed-dscp-transmit keyword to cause all matched out-of-profile traffic to be
marked down as specified in the markdown map (see the “Configuring DSCP Markdown
Values” section on page 31-68).
Note When you create a policer that does not use the pir keyword and the maximum_burst_bytes
parameter is equal to the normal_burst_bytes parameter (which is the case if you do not enter
the maximum_burst_bytes parameter), the exceed-action policed-dscp-transmit keywords
cause PFC QoS to mark traffic down as defined by the policed-dscp max-burst markdown
map.
• (Optional) For traffic that exceeds the PIR, you can specify a violate action as follows:
–
To mark traffic without policing, enter the transmit keyword to transmit all matched
out-of-profile traffic.
–
The default violate action is equal to the exceed action.
