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

Router Redundancy Overview

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The BofL Retries parameter sets the number of BofL messages the interface

transmits before the router declares the circuit down. The default value for router

redundancy is 4.

The number of seconds between BofL messages is the value of the BofL Timeout

parameter divided by the BofL Timeout Divisor parameter. The default value for

the BofL Timeout parameter is 5 seconds. When you enable router redundancy,

the software sets the default value of the BofL Timeout Divisor parameter to 10,

and thereby shortens the interval between BofL messages to 0.5 seconds.

With a divisor value of 10, and a retries value of 4, the router takes 2 seconds to

detect 4 missed BofLs and initiate a role change. The entire role change procedure

takes about 3 seconds.

You may want to set the retries to a value higher than 4 depending on the nature of

your network. If your network typically carries traffic in bursts, setting the retries

value to 4 could trigger frequent, unnecessary role-switching.

Refer to Appendix D for parameter descriptions and instructions for using Site

Manager to edit these parameters.

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. Resources are determined by IP address, so all resources must be

running TCP/IP.

Nortel 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