Avaya Configuring Interface and Router Redundancy Uživatelský manuál stáhnout pdf (Strana 76)

Configuring Interface and Router Redundancy

B-2 114079 Rev. B

Possible Scenarios

The sections below describe possible scenarios and how they would affect the

redundant routers.

Secondary Router Degraded

Degradation of the secondary router’s interface and ability to reach resources does

not affect the current operation of the primary router. This change does affect the

primary and best-secondary selection process because the degraded secondary

router has a lesser chance to become primary.

Secondary Router Becomes Inoperable

Degradation of the secondary router to the extent that it is inoperable does not

affect the operation of the primary router. However, if the primary router detects

local faults, it must remain primary and continue data transfer as best it can.

Primary Router Degraded

If the degree of degradation in the primary router is so slight that it is still the best

primary router, no change occurs.

If the degradation is such that the current primary router is no longer the best

primary, role switch to a new primary may occur, depending on the availability of

a secondary router, and on how you have set the Automatic Role Switching

parameter. The primary and best-secondary selection process is the same as

during initial bootup.

Primary Router Fails

The sudden failure of the primary router causes the best secondary router to

switch roles to primary. Because the primary and best-secondary selection process

is performed continuously and involves all members of the router redundancy

group, no bidding process need occur at this time, and the switch occurs with

minimal delay.

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Avaya Configuring Interface and Router Redundancy Uživatelský manuál Strana 76