Avaya Configuring Interface and Router Redundancy Manual do Utilizador descarregar pdf (Página 25)

Router Redundancy Overview

308626-14.00 Rev 00

2-5

Table 2-2. Redundancy Protocol PDU Flow Diagram for SOS PDUs

Router A PDU Router B

Router A, currently the primary router,

sends Primary Hello PDUs at periodic

intervals.

Hello PDU

Role = Primary

---------------->

Router B, currently a secondary router,

receives the periodic Primary Hello

PDUs and updates the redundancy

group database.

Router B restarts the Primary OK Timer.

Receives the periodic Hello PDUs and

updates the redundancy group data-

base.

Hello PDU

Role = Secondary

<----------------

Router B sends periodic Hello PDUs.

Router A detects local partial failures; for

example, an important interface has

failed. Router A knows that Router B is a

better primary router, so Router A plans

to change its role to secondary.

Router A issues an SOS PDU to inform

all members of the redundancy group of

its intention to change out of the primary

role.

SOS PDU

Role = Primary

---------------->

Router B, the best secondary router,

receives the SOS PDU, and confirms

that it is the best secondary router by

sending the SOS Reply PDU.

Router A, the current primary router,

receives the SOS Reply PDU with its OK

indication from Router B.

SOS Reply PDU

Role = Secondary

<----------------

Router B sends the SOS Reply PDU,

indicating that it is ready to be the new

primary router, and that it is OK for the

current primary router to change out of

the primary role.

Router A sends an SOS Primary Good-

bye PDU, then changes out of the

primary role.

SOS Primary

Goodbye PDU

Role = Primary

---------------->

Router B receives the SOS Primary

Goodbye PDU.

Router A may not receive this PDU, but

all other members of the redundancy

group do.

This message tells the other secondary

members to delay bidding for the new

primary role until after the bidding timer

expires and they detect that there is no

primary router.

SOS New Primary

PDU

Role = Secondary

<----------------

Router B sends the SOS New Primary

PDU to indicate that it is changing roles

to become the new primary router.

Router B changes its role to become the

new primary router.

Router A may not receive this PDU. All

other members of the redundancy group

do, and update their redundancy group

databases.

Hello PDU

Role = Primary

<----------------

Router B has finished the role change

and is now the new primary router.

Router B sends its first periodic Primary

Hello PDU.

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