Atm Oversubscription For Dynamic Interfaces; How Oversubscription Works; Static Atm 1483 Subinterfaces - Juniper JUNOSE SOFTWARE 11.2.X - LINK LAYER CONFIGURATION GUIDE 7-7-2010 Configuration Manual

ATM Oversubscription for Dynamic Interfaces

Copyright © 2010, Juniper Networks, Inc.
attributes are returned, a user login is created, and the dynamic interfaces are configured
from the RADIUS attributes.
ATM 1483 interfaces may receive configuration data from the RADIUS server in the form
of traffic-shaping parameters.
Any changes made to a RADIUS configuration for a given dynamic interface do not take
effect until an existing dynamic interface configured from this RADIUS entry is re-created,
that is, deleted and then dynamically created.
You can take advantage of oversubscription of static ATM 1483 subinterfaces and
bulk-configured ATM VCs with the following dynamic interface configurations:
The router supports oversubscription of static ATM 1483 subinterfaces when you
configure the static ATM 1483 subinterface to support one of the following dynamic
upper-layer encapsulation types: bridged Ethernet, IP, Multilink PPP, PPP, and PPPoE
interfaces. For information about configuring dynamic upper-layer encapsulation types
over a static ATM 1483 subinterface, see "About Configuring Dynamic Interfaces over
Static ATM" on page 518.
The router supports oversubscription of bulk-configured VC ranges when you create
a bulk-configured VC range on a static ATM AAL5 interface for use by a dynamic
ATM 1483 subinterface. For information about configuring dynamic ATM 1483
subinterfaces with bulk-configured VC ranges, see "Configuring ATM 1483 Dynamic
Subinterfaces" on page 624 in "Configuring Dynamic Interfaces Using Bulk Configuration"
on page 619.

How Oversubscription Works

Oversubscription is based on the capabilities of the ATM line module on which the dynamic
interface is configured. For details about the capabilities of specific ATM line modules,
see either "Module Capabilities" on page 11 in "Configuring ATM" on page 3, or the Link
Layer Maximums tables in JunosE Release Notes, Appendix A, System Maximums.
Each ATM line module supports a maximum number of configured subinterfaces or VCs,
and a smaller maximum number of subinterfaces or VCs that can be active at any one
time. The maximum number of active subinterfaces or VCs determines the number of
subscribers that can connect to the router through this line module at any one time.
As a result, you can oversubscribe static ATM 1483 subinterfaces or bulk-configured VC
ranges by creating up to the maximum number of configured subinterfaces or VCs
supported on the module, knowing that no more than the maximum number of active
subinterfaces or VCs can be connected to the router at any one time.

Static ATM 1483 Subinterfaces

An active static ATM 1483 subinterface currently supports a dynamic upper-layer
encapsulation type such as PPP or PPPoE. For ATM line modules that support ATM
subinterface oversubscription, the maximum number of active subinterfaces supported
per module is less than the maximum number of configured subinterfaces supported
per module.
Chapter 17: Configuring Dynamic Interfaces
515