Avaya Configuring Interface and Router Redundancy Uživatelský manuál stáhnout pdf (Strana 80)

Configuring Interface and Router Redundancy

B-6 114079 Rev. B

To provide redundancy for this WAN:

1. Deﬁne the remote interface on the other side of the WAN as a resource in

the conﬁguration of Router A.

2. Set the Automatic Role Switching parameter to Auto for Router B.

These two steps allow the primary and best-secondary router selection

process to consider the WAN interface as a resource, and to use the

unavailability of this resource to trigger role switching.

3. Conﬁgure Router B to have a higher priority than Router A to become

the primary router.

Router B will assume the primary role only when Router A, with the lower

priority to be primary, loses the remote router as a resource.

4. Conﬁgure Router B with a dial-on-demand circuit, but disable outbound

calling.

Router B is now capable of receiving a dialed call.

For instructions on conﬁguring dial lines, refer to Conﬁguring Dial Services.

5. Conﬁgure the remote router with dial backup.

The remote router will only initiate a call to Router B if the WAN line to

Router A fails.

If the WAN interface becomes nonfunctional for any reason, the resource deﬁned

for it is unreachable. This causes Router A, the current primary router, to cease

being the best primary router, and a role switch occurs. Router B, with its dial-up

connection to the remote router, becomes the primary router. Note, however, that

because Router A and Router B must have identical conﬁgurations, the remote

router must initiate the dial backup connection.

The effect is that the dial-up connection is a redundant interface for the WAN

connection. Note that in this case the dial-up synchronous interface between

Router B and the remote router is active only when the WAN interface fails.

Router A and Router B can be at the branch ofﬁce; the remote router is at the

central or regional ofﬁce.

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Avaya Configuring Interface and Router Redundancy Uživatelský manuál Strana 80