Avaya Configuring Interface and Router Redundancy Manuel d'utilisateur télécharger pdf (Page 71)

Router Redundancy Examples

114079 Rev. A B-3

Possible Complications

Router Boots and Cannot Detect Another Member

If a member of a router redundancy group boots and cannot detect any other

member of its redundancy group within the bidding period, it switches roles to

become the primary router, because it is the only member from which to select the

primary.

Second Router Boots After First Router’s Bidding Timer Expires

If the ﬁrst router has booted and a second router boots after the ﬁrst router’s

bidding period expires, the ﬁrst router may be in the process of switching roles to

become the primary router. During the switching process, the ﬁrst router does not

send PDUs, so when the second router boots and begins its own bidding period, it

may not detect the ﬁrst router until the ﬁrst router has completed the role switch.

To avoid a situation in which both routers switch roles to become primary, set the

bidding period for a longer time than the time required to perform a role switch.

Manual vs. Auto Role Switching

If the ﬁrst router has booted and a second router boots after the ﬁrst router’s

bidding period expires, and if you conﬁgured the router to use manual role

switching, the ﬁrst router continues to act as the primary router even if the second

router would be a better primary. The software alerts you to the situation, and it is

up to you to initiate the role switch. If you conﬁgure the router to use auto role

switching, the routers perform the role switch automatically.

During manual role switching, a secondary router switches its role to primary if it

does not detect a primary router in the group.

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Avaya Configuring Interface and Router Redundancy Manuel d'utilisateur Page 71