Juniper JUNOSE 11.2, Configuration Manual

Page: 663 / 772

•
If a VC subrange includes a statically defined ATM interface, overriding profile
assignments configured for the same VPI/VCI address as a statically defined ATM
interface become inactive until the static ATM 1483 subinterface is removed. The
overriding profile becomes active again when you remove the static ATM 1483
subinterface. You can display the current operational status (active or inactive) of
overriding profile assignments by using “show atm bulk-config” on page 683 .
• Operations that add, remove, modify, merge, disable, or enable VC subranges within
a bulk-configured VC range do not affect any static ATM interfaces defined within the
VC subrange.
• You cannot create a static ATM circuit if the VPI/VCI address conflicts with an existing
ATM 1483 dynamic subinterface column. Such a configuration would disrupt subscribers
already connected to the router via the dynamic subinterface.
•
You cannot create a static ATM interface with a VPI/VCI address that falls within a
range of circuits reserved for use by the MPLS downstream-on-demand label
distribution method.
•
You cannot configure CAC on a static ATM interface within an existing bulk-configured
VC subrange. Conversely, you cannot create a bulk-configured VC subrange that
includes a static ATM interface on which CAC is configured. (For information about
how to use the
atm cac command to configure CAC, see “Setting Optional Parameters”
on page 23 in “Configuring ATM” on page 3.)
For configuration information and examples, see “Configuring Static ATM Interfaces
Within VC Subranges” on page 650.
Terminating Stale PPPoA Subscribers and Restarting LCP Negotiations
In configurations of dynamic IP over dynamic PPP over a dynamic (bulk-configured)
ATM 1483 subinterface, the router sends an LCP terminate request packet to a PPPoA
CPE device in response to receipt of an IPv4-over-PPP data packet or an IPv6-over-PPP
data packet when the dynamic ATM 1483 subinterface transitions to a dormant state
due to an ungraceful subscriber logout. This action terminates stale PPPoA subscribers
and causes the CPE to restart LCP negotiations. This behavior is always in effect on the
router and does not require CLI or SNMP configuration.
The implementation of this feature for dynamic ATM 1483 subinterfaces is almost identical
to the implementation for static ATM 1483 subinterfaces, with the following difference:
• For static ATM 1483 subinterfaces, the restart of LCP negotiations by the CPE causes
the router to re-create the dynamic PPP and IP upper-layer interfaces above the static
ATM 1483 subinterface.
•
For dynamic ATM 1483 subinterfaces, the receipt of a PPP data packet from the CPE
causes the router to re-create only the dynamic ATM 1483 subinterface to send the
LCP terminate request packet, but not the dynamic PPP and IP upper-layer interfaces
above the dynamic ATM 1483 subinterface. The router re-creates the dynamic PPP
and IP upper-layer interfaces when the CPE restarts LCP negotiations.
For details about the operation and benefits of this feature, see “Terminating Stale PPPoA
Subscribers and Restarting LCP Negotiations” on page 530 in “Configuring Dynamic
631 Copyright © 2010, Juniper Networks, Inc.
Chapter 18: Configuring Dynamic Interfaces Using Bulk Configuration