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Configuring Interface and Router Redundancy

3-4 114079 Rev. B

Table 3-1 demonstrates what happens when you conﬁgure interface redundancy

across slots when you are using router and interface redundancy together.

Note that you can prevent the second role change by conﬁguring the Automatic

Role Switching parameter to Switch on Failure or One Shot Auto (refer to

Chapter 5).

Compatibility

For Release 11.01/5.01, we have simpliﬁed the procedure for conﬁguring router

redundancy, and reduced to under 3 seconds the amount of time required for

routers to switch in and out of the primary role. Because of these changes, when

you install Software Version 11.01/5.01, you must completely reconﬁgure router

redundancy.

Table 3-1. Using Interface Redundancy across Slots with Router Redundancy

Router A Router B

Router A is in the primary role for router

redundancy. It also has the active interface in

the interface redundancy group.

Router B is in the secondary role.

The CPU board for the active interface fails.

Router A detects that it is no longer the best

primary router, so Router A changes its role to

secondary.

Router B is the new best primary router, and it

assumes the primary role.

Meanwhile, a redundant interface from the

interface redundancy group has become active,

with the result that Router A is again the best

primary router in the router redundancy group.

Router B recognizes that it is no longer the best

primary router and changes out of the primary

role.

Router A assumes the primary role. Router B is in the secondary role.

Data is moving again.

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Avaya Configuring Interface and Router Redundancy Manuale Utente Pagina 40