Avaya Configuring Interface and Router Redundancy Manuel d'utilisateur télécharger pdf (Page 27)

Router Redundancy Overview

2-5

Role Change

A router may change out of the primary role because of router failure, failure of

one or more interfaces, or because it cannot reach its resources.

Router Failure

If the primary router in a router redundancy group fails entirely, it obviously is no

longer the best primary router, and a role change occurs, as outlined in T

able 2-1

and T

able 2-2.

Interface Failure

If one or more interfaces on the primary router fail, it is probably no longer the

best primary router, depending on the status of the interfaces on the other routers

in the router redundancy group. If it is not the best primary router, it changes out

of the primary role.

Speed of Failed Interface Detection for Ethernet

To increase the speed of detecting failed interfaces and changing roles on Ethernet

connectors, set the BOFL Timeout parameter to a short interval, such as one

second. The cost is LAN bandwidth and CPU overhead. To access the BOFL

Timeout parameter, select Lines➔Edit Lines in the Circuit Deﬁnition window. For

further information, refer to Conﬁguring Line Services.

Resource Availability

A router is functioning normally if it can reach the resources — servers, printers,

and other devices — with which you conﬁgure it to communicate. If a primary

router in a redundancy group cannot reach its resources, it changes out of the

primary role.

Bay Networks redundancy software includes several parameters that allow you to

control how often and how many times a router attempts to ping its resources (see

Chapter 5).

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Avaya Configuring Interface and Router Redundancy Manuel d'utilisateur Page 27