> Hello,
> If prefixes in the router are deleted by admin, what should be the behaviour
> of RA (Router advertisement). I think Neighbor discovery spec doesn't
> specify about this.
It depends on what the semantics are of the administrative
"delete" operation.
There are 2.5 possible interpretations:
- Immediately remove the prefix.
To do this robustly for nodes that are not connected to the link
the hole time the router(s) need to advertise the prefix with zero
lifetimes until the end of the original lifetime has expired.
- Remove the prefix by stopping to extending the lifetime.
This can be done by either
- stop advertising the prefix. This causes existing nodes
to decrement the lifetime in real time.
- advertiseing the prefix with a lifetime decrementing in real time.
This is the same as the "stop" except that newly arriving nodes
will configure the addresses with a short lifetime.
So you are correct that RFC 2461 doesn't specify the semantics of such
*management operations* and how they map to the routers configuration
information. But the spec does specify how this configuration information
is advertised in the protocol and how the information received in the
protocol affects the configuration on the hosts.
Erik
> Thanks in advance for clarification.
>
> Basavaraj
>
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