HP 5920 Series Command Reference Manual page 451

Garbage-collect timer—Interval from when the metric of a route becomes 16 to when it is deleted
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from the routing table. During the garbage-collect timer length, RIPng advertises the route with a
metric of 16. If no update is announced for that route before the garbage-collect timer expires,
RIPng deletes the route from the routing table.
HP recommends not changing the default values of these timers.
The timer lengths must be kept consistent on all routers in the network.
Examples
# Configure the update, timeout, suppress, and garbage-collect timers as 5 seconds, 15 seconds, 15
seconds, and 30 seconds.
<Sysname> system-view
[Sysname] ripng 1
[Sysname-ripng-1] timers update 5 timeout 15 suppress 15 garbage-collect 30
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