Aging; Removing Circuits; Operations, Administration, And Management Of Atm Interfaces; End-To-End And Segment Endpoints - Juniper JUNOSE SOFTWARE 11.2.X - LINK LAYER CONFIGURATION GUIDE 7-7-2010 Configuration Manual

JunosE 11.2.x Link Layer Configuration Guide

Operations, Administration, and Management of ATM Interfaces

End-to-End and Segment Endpoints

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InARP and static mapping are complementary within an NBMA subinterface, but are not
compatible with regard to individual circuits. If InARP is configured on a circuit, the
corresponding virtual circuit descriptor (VCD) cannot be present in a static map applied
to that interface.

Aging

ARP table entries, with the exception of those declared static, are aged out based on an
aging interval defined on a subinterface basis. For the purposes of aging, entries produced
via a static map are treated as static ARP table entries. InARP-generated entries are also
treated as static; however, the InARP state machine automatically removes entries that
cannot be successfully refreshed after three successive failed InARP requests.

Removing Circuits

If a circuit is removed, it is also removed from the ARP table, but not from the static map.
If the circuit is reconfigured, a new ARP table entry is generated from the existing map
entry. If the circuit uses InARP, the ARP table entry is immediately removed on removal
of the circuit.
If a subinterface is removed, all associated circuits and their associated ARP table entries
are removed.
ATM interfaces support the OAM standards of the ITU, per recommendation I.610. OAM
provides VC/VP integrity and fault and performance management. The E Series router
supports F4 and F5 ATM OAM fault management, loopback, and continuity check (CC)
cells. These cells perform fault detection and notification, loopback testing, and link
integrity.
ATM uses F4 and F5 cell flows as follows:
F4—Used in VPs
F5—Used in VCs
ATM interfaces always generate and validate CRC-10 checksums on OAM cells.
For information about configuring OAM on the router, see the following sections:
"Configuring OAM" on page 31
"Configuring F5 OAM for Data PVCs" on page 48
An ATM connection consists of a group of points. This OAM implementation provides
management for the following points:
Connection endpoint—The end of a VC/VP connection where the ATM cells are
terminated
Segment endpoint—The end of a connection segment
Copyright © 2010, Juniper Networks, Inc.