HP ProCurve 3500yl Release Notes page 84

Software version k.13.49
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Enhancements
Release K.13.02 Enhancements
where
VID = 16
VRID = 23
PDT = 12 seconds
VRRP Preempt Mode with LACP and Older ProCurve Devices
There can be an issue with VRRP Preempt Mode if an older ProCurve device (2524, 2650, 2848, 3400cl,
or 5300) is the intermediate device connecting to a VRRP router and has LACP set in "enable, passive"
mode. This mode is set by default on older ProCurve devices, whereas it is disabled by default on
later models such as the ProCurve Series 5400zl. ProCurve recommends that you use compatible
LACP settings on devices that connect with VRRP routers on VRRP VLANs.
What Occurs at Startup
When the Owner router comes online, it will wait for the configured amount of time before taking
control of the virtual IP address. This period of time is calculated as follows:
If the value of the Master down time (3 * advertisement interval) is less than or equal to the preempt delay
time, then the Owner router will wait until the Master down time (3 * advertisement interval) has expired.
During this waiting period, if the Owner router receives a VRRP packet for its virtual IP address from
the Backup router, it will wait until the PDT expires before taking control of its virtual IP address. If
the Owner router does not receive any VRRP packets and the Master down time expires, the Owner
router can take control of its virtual IP address immediately.
If the value of the Master down time (3 * advertisement interval) is greater than the preempt delay time,
then the Owner Router will wait until the PDT expires before taking control of its virtual IP address.
Selecting a Value for the PDT
You should select the value for the PDT carefully to allow time for OSPF to populate the Owner
router's route tables. The choice depends on the following:
The OFPF router dead interval—the number of seconds the OSPF router waits to receive a
hello packet before assuming its neighbor is down.
The number of router interfaces that participate in OSPF
The time it may take from reception of the OSPF packets to when the population of the route
table is completed.
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