15-11
Cisco 10000 Series Router Quality of Service Configuration Guide
OL-7433-09
Chapter 15 Oversubscribing Physical and Virtual Links
Configuring Oversubscription
Oversubscribing ATM VBR-nrt VCs
To enable oversubscription of ATM VBR-nrt VCs, enter the following commands beginning in global
configuration mode:
Note
You do not need to use the
service-policy
command to specify the ATM VC oversubscription because a
variable bit rate (VBR) ATM VC uses sustained cell rate (SCR) to define the VC’s average transmission
rate.
Example 15-2
oversubscribes an ATM interface by five times the physical transmission capacity.
Example 15-2 Oversubscribing an ATM VC
Router(config)#
interface serial 1
Router(config-if)#
atm over-subscription-factor 5
Oversubscribing Frame Relay PVCs
To oversubscribe Frame Relay PVCs, perform one of the following configuration tasks:
•
Oversubscribing Frame Relay PVCs Using Hierarchical Policies, page 15-12
•
Oversubscribing Frame Relay PVCs Using a Map Class, page 15-15
Command
Purpose
Step 1
Router(config)#
interface
type
slot
/
subslot
/
port
.
subinterface
Specifies the interface or subinterface on which you want to
enable VC oversubscription. Enters interface or
subinterface configuration mode.
Step 2
Router(config-if)#
atm over-subscription-factor
{
factor
}
Oversubscribes an ATM VC.
factor
specifies the amount of oversubscription. The default
value is 1, which indicates no oversubscription. Valid values
are:
•
1 to 500 on the PRE2—Requires Cisco IOS Release
12.3(7)XI3 or later releases, or Cisco IOS
Release 12.2(28)SB
•
1 to 500 on the PRE3—Requires Cisco IOS
Release 12.2(31)SB2 or later releases
Note
Use this command for each ATM interface that you
want to oversubscribe.
