Cisco Cisco IOS Software Release 12.2(27)SBC

The priority traffic of one logical interface cannot only impose burstiness on other traffic, but also starve 
other traffic. The only way to prevent the starvation of other traffic is by configuring a policer on the 
priority queue by limiting the percent of priority traffic to less than 90 percent of the parent bandwidth 
and the port bandwidth. 

 describes the configuration granularity for the three-level scheduler.

To configure bandwidth-remaining ratios on subinterface-level and class-level queues, see the 
Distribution of Remaining Bandwidth Using Ratio, Release 12.2(31)SB2 feature module.

This section provides the following configuration examples:

The following example configuration consists of one policy map named Child with the following traffic 
classes defined: prec0, prec2, and class-default. The policy is attached to the ATM interface 1/0/0, which 
has a configured rate of 1000 kbps.

policy-map Child

class prec0

bandwidth 300

class prec2

bandwidth 100

class class-default

bandwidth 50

!

interface atm 1/0/0

bandwidth 1000

service-policy output Child

Less than or equal to 2 Mbps

.4%

Greater than 2 Mbps and less than 1 Gbps

.2%

Greater than or equal to 1 Gbps

.1%