NCP
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... problems are handled by a family of Network Control Protocols
(NCPs), which each manage the specific needs required by their
respective network-layer protocols. These NCPs ...
... NCPs), which each manage the specific needs required by their
respective network-layer protocols. These NCPs are defined in
companion documents.
...
... LCP),
the same facilities are designed to be used by other control
protocols, especially the family of NCPs.
...
... range identify packets belonging to the
associated Network Control Protocols (NCPs), if any.
...
... range are used for
protocols with low volume traffic which have no associated NCP.
Protocol field values in the "c***" to "f***" range ...
...
Then, PPP MUST send NCP packets to choose and configure one or more
network-layer protocols. Once each of the chosen network-layer ...
... link will remain configured for communications until explicit LCP
or NCP packets close the link down, or until some external event
occurs (an inactivity timer ...
... network-layer protocols is handled
by separate Network Control Protocols (NCPs) during the Network-Layer
Protocol phase.
...
...
Each NCP MAY be Opened and Closed at any time.
...
... link quality determination, implementations SHOULD
avoid fixed timeouts when waiting for their peers to configure a
NCP.
...
... network-layer protocol packets. Any supported
network-layer protocol packets received when the corresponding NCP is
not in the Opened state MUST be silently discarded.
...
... traffic consists of any possible combination
of LCP, NCP, and network-layer protocol packets.
...
... link by LCP is sufficient. There is no need
for each NCP to send a flurry of Terminate packets. Conversely,
the fact that one NCP has Closed is not sufficient reason to cause
...
... for each NCP to send a flurry of Terminate packets. Conversely,
the fact that one NCP has Closed is not sufficient reason to cause
the termination of the PPP link ...
... the termination of the PPP link, even if that NCP was the only NCP
currently in the Opened state ...
... The RXJ+ event arises when the rejected value is acceptable, such
as a Code-Reject of an extended code, or a Protocol-Reject of a
NCP. These are within the scope of normal operation. The
implementation MUST stop sending the offending packet type.
...
... Typically, this action is used by the LCP to signal the Up event
to a NCP, Authentication Protocol, or Link Quality Protocol, or
...
... Authentication Protocol, or Link Quality Protocol, or
MAY be used by a NCP to indicate that the link is available for
its network ...
... Typically, this action is used by the LCP to signal the Down event
to a NCP, Authentication Protocol, or Link Quality Protocol, or
...
... Authentication Protocol, or Link Quality Protocol, or
MAY be used by a NCP to indicate that the link is no longer
available for its network ...
... LCP to advance to the
Link Dead phase, or MAY be used by a NCP to indicate to the LCP
that the link ...
... LCP
that the link may terminate when there are no other NCPs open.
This results of this action are highly implementation dependent.
...