Avaya Configuring Interface and Router Redundancy Manuel d'utilisateur télécharger pdf (Page 21)

Interface Redundancy Overview

1-3

During normal data transfer, if the active interface fails, the following interfaces

become active, in this order:

1. Redundant interfaces on the slot that is processing the routing/bridging table

for this circuit

2. Redundant interfaces on other slots

Role Change Speed on 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

Hot and Warm Standby

When a redundant interface takes over for a failed interface without interruption in

service, it does so under one of two conditions:

hot

standby

warm standby.

Hot Standby

When the active interface fails, but the circuit is still up, the new active interface

retains access to the routing/bridging tables, and can continue transmission

immediately.

Only if the routing/bridging tables are on another slot from the new active

interface is there any loss in performance. The priority rules for interfaces to

become active operate to avoid this situation whenever possible.

Warm Standby

When the active interface fails and the circuit has gone down, the CPU module

processing the routing/bridging table is at fault, and the router loses the

routing/bridging tables.

Transmission continues, but is slower than in the case of hot standby, because the

new active interface must relearn the routing/bridging tables.

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Avaya Configuring Interface and Router Redundancy Manuel d'utilisateur Page 21