Avaya Configuring Interface and Router Redundancy Manual do Utilizador descarregar pdf (Página 19)

Interface Redundancy Overview

308626-14.00 Rev 00

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

BofL Parameters and Role Change Speed on Ethernet

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.

Three parameters control BofL. The BofL Retries parameter sets the number of

BofL messages the interface transmits before the router declares the circuit down.

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

parameter divided by the BofL Timeout Divisor parameter.

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 1 second.

If you also set the BofL Retries parameter to 4, and accept the BofL Timeout

Divisor parameter default value of 1, a role change occurs in under 5 seconds. If

you set the BofL Timeout Divisor parameter to a higher value, the router sends

BofL messages so frequently that the cost in LAN bandwidth and CPU overhead

is high.

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

Manager to edit these parameters.

Active Interface MAC Address

When you configure interface redundancy, the active interface uses the following

MAC address in hexadecimal radix:

0x 2y yy A2xx xxxx

• 0x 2 indicates that the address is locally administered by Bay Networks.

• y yy indicates the circuit number.

• A2 identifies the Bay Networks organizationally unique identifier (OUI).

• xx xxxx is the unique router identification number.

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Avaya Configuring Interface and Router Redundancy Manual do Utilizador Página 19