Avaya Cajun P882 User Manual page 383

Selecting an
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Interval
Deciding to Use
Authentication
Changing the
Primary IP
address
Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, v5.3.1
associated IP Address. In other words, equal priorities are not
enough for a backup router that is already in the Primary state to
become Backup.
In most cases, leaving the Advertisement Interval to its default value
of 1 is adequate. Usually, this is also desired because it will allow for
the fastest fail over time. As described above, the time a Backup will
become Master if it stops receiving advertisements is approximately
three times this value in seconds. A higher value may be selected if
the network is very stable and less advertisement traffic is desired. In
any case, it is not recommended that the interval be increased to
values above five or six.
In networks where there is little or no security risk and a minimal
chance of miscommunication, authentication is probably not
needed. Using Simple Text Password authentication can provide
protection against accidental misconfiguration. The correct password
must be entered for a new virtual router before it will begin the
VRRP election process with another virtual router. Simple Text
Password authentication does not provide protection from hostile
attacks.
If there is a virtual router that is an IP Address Owner created on an
IP interface, the priority will be changed to 100 (default) if the
Primary IP Address is changed, because a Priority of 255 is reserved
for the IP Address Owner only.
If the virtual router is a non-Address Owner and the associated
Primary IP Address is changed to the same as the virtual router IP
Address, the Priority of that virtual router is changed to 255, since it
is now the IP Address Owner.
If the Primary IP Address is changed so that it is no longer on the
same subnet as an associated virtual router, the virtual router will be
deleted
Configuring IP Routing
9-101