Avaya Configuring ATM and MPLS Services Manual de usuario Pagina 74

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Configuring ATM and MPLS Services
1-44
117374-C Rev 00
Router redundancy requires at least two routers to be members of a router
redundancy group. One router acts as the primary router and provides normal
routing/bridging services. The other router acts as the secondary, backup router
and takes over if the primary router fails.
All members of an ATM router redundancy group must have the following
characteristics:
Be the same ATM router type, for example, BCN
®
, BLN
®
, or System 5000
.
Have the same hardware configuration, including CPU and interface module
types, and slot and port locations of the backed-up interfaces.
Have the same software configuration. That is, you must be running the same
router software version and have the same loadable modules configured.
Contain both a primary configuration file and a secondary configuration file.
Have at least one legacy LAN connection between the routers in the
redundancy group.
PVC Operations and Management Concepts
In most ATM networks, if a PVC fails, the remote device does not receive
notification of the failure at the ATM layer. Instead, the device receives this
information from a non-ATM source such as a routing protocol that operates
above the ATM layer. The PVC Operations and Management (OAM) feature
provides a mechanism by which ATM devices can receive prompt failure
information.
PVC OAM has two methods of detecting PVC failure: loopback and alarms. You
can use either of these methods separately or both methods together. When using
OAM loopback cells, the time can decrease to only a few seconds; when using
OAM alarms, the detection is almost instantaneous.
Note:
Bay Networks recommends at least two legacy LAN connections
between routers in the redundancy group.
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