3Com S7906E Command Reference Manual page 957

The garbage-collect timer defines the interval from when the metric of a route becomes 16 to when
it is deleted from the routing table. During the garbage-collect timer length, RIPng advertises the
route with the routing metric set to 16. If no update message is announced for that route before the
garbage-collect timer expires, the route will be completely deleted from the routing table.
Note that:
You are not recommended to change the default values of these timers under normal
circumstances.
The lengths of these timers must be kept consistent on all routers and access servers in the
network
Examples
# Configure the update, timeout, suppress, and garbage-collect timers as 5s, 15s, 15s and 30s.
<Sysname> system-view
[Sysname] ripng 100
[Sysname-ripng-100] timers update 5
[Sysname-ripng-100] timers timeout 15
[Sysname-ripng-100] timers suppress 15
[Sysname-ripng-100] timers garbage-collect 30
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