The dead interval of neighbors must be longer than the hello interval.
The OSPFv3 fast hello function allows OSPFv3 to fast discovery neighbors and detect whether
neighboring relationships are valid. To enable the OSPFv3 fast hello function, you can specify the
minimal and hello-multiplier keywords and the multiplier parameter in this command. minimal
specifies the deal interval of neighbors to be 1s; hello-multiplier specifies the number of times that
hello packets are sent in a second. Therefore, this configuration reduces the hello interval to be
shorter than 1s.
If an interface is enabled with the fast hello function, the hello-interval field of hello packets to be
advertised by this interface is set to 0, and that of hello packets received from this interface is omitted.
dead-interval, minimal, and hello-multiplier that are introduced to enable the fast hello
function cannot be configured together with hello-interval.
No matter whether the fast hello function is configured, the dead interval of neighbors on the
interconnected interfaces of neighbors must be consistent. The values of hello-multiplier on the
interconnected interfaces can be different but you must ensure that at least one hello packet is
received within the dead interval of neighbors.
You can use the show ipv6 ospf interface command to monitor the dead interval of neighbors and
the fast hello interval on an interface.
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