Virtual Private Routed Network Services
7750 SR OS Services Guide Page 1007
• ITU-T Recommendation I.610 - B-ISDN Operation and Maintenance Principles and Functions
version 11/95
• GR-1248-CORE - Generic Requirements for Operations of ATM Network Elements (NEs). Issue
3 June 1996
• GR-1113-CORE - Bellcore, Asynchronous Transfer Mode (ATM) and ATM Adaptation Layer
(AAL) Protocols Generic Requirements, Issue 1, July 1994
alarm-cells
Syntax [no] alarm-cells
Context config>service>vprn>if>sap>atm>oam
config>service>vprn>sub-if>grp-if>sap>atm>oam
Description This command configures AIS/RDI fault management on a PVCC. Fault management allows PVCC
termination to monitor and report the status of their connection by propagating fault information
through the network and by driving PVCC’s operational status.
When alarm-cells functionality is enabled, a PVCC’s operational status is affected when a PVCC
goes into an AIS or RDI state because of an AIS/RDI processing (assuming nothing else affects
PVCC’s operational status, for example, if the PVCC goes DOWN, or enters a fault state and comes
back UP, or exits that fault state). RDI cells are generated when PVCC is operationally DOWN. No
OAM-specific SNMP trap is raised whenever an endpoint enters/exits an AIS or RDI state, however,
if as result of an OAM state change, the PVCC changes operational status, then a trap is expected
from an entity the PVCC is associated with (for example a SAP).
The no command disables alarm-cells functionality for a PVCC. When alarm-cells functionality is
disabled, a PVCC’s operational status is no longer affected by a PVCC’s OAM state changes due to
AIS/RDI processing (note that when alarm-cells is disabled, a PVCC will change operational status to
UP due to alarm-cell processing) and RDI cells are not generated as result of the PVCC going into
AIS or RDI state. The PVCC’s OAM status, however, will record OAM faults as described above.
Default Enabled for PVCCs delimiting VPRN SAPs
periodic-loopback
Syntax [no] periodic-loopback
Context config>service>vprn>if >sap>atm>oam
config>service>vprn>sub-if>grp-if>sap>atm
Description This command enables periodic OAM loopbacks on this SAP. This command is only configurable on
VPRN SAPs. When enabled, an ATM OAM loopback cell is transmitted every period as configured
in the config>system>atm>oam>loopback-period period context.
If a response is not received and consecutive retry-down retries also result in failure, the endpoint will
transition to an alarm indication signal/loss of clock state. Then, an ATM OAM loopback cell will be
transmitted every period as configured in the loopback-period period. If a response is
received for the periodic loopback and consecutive retry-up retries also each receive a response, the
endpoint will transition back to the up state.
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