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ATM Oversubscription for Bulk-Configured VC Ranges
Copyright © 2010, Juniper Networks, Inc.
The atm atm1483 auto-configure command specifies the types of dynamic
upper-interface encapsulations that are accepted or detected by a dynamic ATM 1483
subinterface. For flexibility, the router provides the ability to configure an ATM 1483
subinterface with distinct profile assignments for each encapsulation type supported by
the atm atm1483 auto-configure command. For more information about using this
command, see "atm atm1483 auto-configure" on page 635.
In contrast to dynamic ATM 1483 subinterfaces, dynamic VLAN subinterfaces support
recognition and creation of simultaneous IP and PPPoE upper dynamic interface types.
The vlan auto-configure command identifies the encapsulation type. For flexibility, the
router provides the ability to configure a VLAN subinterface with distinct profile
assignments for each encapsulation type supported by the vlan auto-configure command.
For more information about using this command, see "vlan auto-configure" on page 670.
For more information about configuring profiles, see "Configuring a Dynamic Interface
from a Profile" on page 559 in "Configuring Dynamic Interfaces" on page 511.
You can take advantage of oversubscription of bulk-configured ATM VCs. 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.
Oversubscription of bulk-configured VC ranges works in a similar, but not identical, manner
to oversubscription of static ATM 1483 subinterfaces that support dynamic upper-layer
encapsulation types. For more information, see "ATM Oversubscription for Dynamic
Interfaces" on page 515 in "Configuring Dynamic Interfaces" on page 511.
Bulk-Configured VC Ranges
An active bulk-configured VC range is associated with a dynamic ATM 1483 subinterface
that supports a dynamic upper-layer encapsulation type. For ATM line modules that
support VC oversubscription, the maximum number of active bulk-configured VCs per
line module is less than the maximum number of individual VCs created from the total
number of bulk-configured VC ranges that the line module supports. For information
about configuring dynamic ATM 1483 subinterfaces with bulk-configured VC ranges, see
"Configuring ATM 1483 Dynamic Subinterfaces" on page 624.
When the maximum number of active bulk-configured VCs has been reached, the router
prevents all additional subscribers associated with the remaining inactive bulk-configured
VCs from connecting to the line module until one of the following conditions occurs:
At least one currently active subscriber logs out, which causes the router to tear down
the dynamic interface column for that subscriber. Although the dynamic ATM 1483
subinterface and its associated VC remain configured on the router, the subinterface
becomes inactive and can be replaced by one of the bulk-configured VCs waiting to
become active.
The router tears down at least one dynamic interface column in its entirety, which
involves administratively shutting down the associated dynamic ATM 1483 subinterface.
Chapter 18: Configuring Dynamic Interfaces Using Bulk Configuration
621
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