17-5
Cisco 10000 Series Router Quality of Service Configuration Guide
OL-7433-09
Chapter 17 Configuring Dynamic Subscriber Services
Applying Traffic Shaping Parameters Using RADIUS Profiles
Usage Guidelines for the default dbs enable Command
The
default
dbs enable
command is not nvgenned and does not appear in the output of the
show running-config
command when configured.
Use the
default dbs enable
command to remove the
dbs enable
command or the
no dbs enable
command from a configuration. For example, in the following configuration we enable DBS on
PVC 1/55:
Router(config)#
interface atm 6/0/0.600 point-to-point
Router(config-if)#
pvc 1/55
Router(config-if-atm-vc)#
dbs enable
Router(config-if-atm-vc)#
encapsulation aal5mux ppp Virtual-Template1
Router(config-if-atm-vc)#
end
We later decide to change the PVC configuration so that a VC class is applied to the PVC. The
configuration of the VC class, named vc-test, includes the
dbs enable
command. Therefore, we must
remove the
dbs enable
command from the PVC configuration by using the
default dbs enable
command.
The
default dbs enable
command removes the
dbs enable
command from the PVC configuration, as
shown in the following configuration, but it does not remove the ability to do DBS under the VC class.
Notice that the
default dbs enable
command also does not appear in the PVC configuration.
vc-class atm vc-test
vbr-nrt 505 505
dbs enable
encapsulation aal5mux ppp Virtual-Template1
!
interface ATM6/0/0.600 point-to-point
pvc 1/55
class-vc vc-test
PCR and SCR Parameters for Multiple Sessions on a VC
DBS selects the PCR and SCR parameters for a VC on which multiple PPPoE sessions are allowed and
applies the parameters to the VC. The RADIUS profile values for the first user on a VC override the
default values of the VC. At any time, DBS selects the PCR and SCR values that are the highest of all
the sessions. Adding and removing sessions from the VC can result in changes in the PCR and SCR
parameters.
If users already exist on the VC, each new value overrides the existing configuration only if the value is
higher than the existing value. If the selected PCR value is higher than available bandwidth, DBS applies
the highest value supported on the VC. If the PCR is less than the minimum PCR supported on a VC,
DBS applies the minimum supported value.