Avaya Configuring Interface and Router Redundancy Manual do Utilizador descarregar pdf (Página 26)

Configuring Interface and Router Redundancy

2-6

308626-14.00 Rev 00

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 Tables 2-1

and 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.

BofL Parameters and Role Change Speed for Ethernet

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

connectors, the software automatically shortens the values in the BofL parameters

when you enable router redundancy. The relevant parameters are BofL Timeout,

BofL Retries, and BofL Timeout Divisor.

When you enable BofL, the router only sends BofL messages if the interface is

idle. If the interface is transmitting regular data traffic, it does not send BofL

messages.

Note:

If the routers in a router redundancy group are running Version 11.01 or

later, and Version 11.00 or earlier, a router in the group must reboot (also

referred to as a warm boot) to perform a role change. To configure this, see

Chapter 5.

If all the routers in a router redundancy group are running Version 11.01 or

later, a router in the group can perform a role change without rebooting (also

referred to as a hot swap). To configure this, see Chapter 5.

All routers in a router redundancy group must use the same warm boot setting.

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Avaya Configuring Interface and Router Redundancy Manual do Utilizador Página 26