negotiation
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This self-configuration is implemented through an extensible
option negotiation mechanism, wherein each end of the link
describes to the other its capabilities and requirements ...
... describes to the other its capabilities and requirements.
Although the option negotiation mechanism described in this
document is specified in terms of the Link Control Protocol (LCP ...
... Receive Unit (MRU), which defaults to 1500 octets. By
negotiation, consenting PPP implementations may use other values
for the MRU ...
... The Option Negotiation Automaton ...
... Nak packets are used to refuse a Configuration Option
value, and to suggest a new, acceptable value. Configure-Reject
packets are used to refuse all negotiation about a Configuration
Option, typically because it is not recognized or implemented.
The use of Configure-Nak versus Configure-Reject is more fully
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The protocol makes a reasonable attempt at avoiding Configuration
Option negotiation loops. However, the protocol does NOT guarantee
that loops will not happen. As with any negotiation, it is possible
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... Option negotiation loops. However, the protocol does NOT guarantee
that loops will not happen. As with any negotiation, it is possible
to configure two PPP implementations with conflicting policies that
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Finally, an implementation may be configured to request the
negotiation of a specific Configuration Option. If that option is
not listed, then that option MAY be appended to the list of Nak'd
Configuration Options, in order to prompt the peer to include that
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If some Configuration Options received in a Configure-Request are
not recognizable or are not acceptable for negotiation (as
configured by a network administrator), then the implementation
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... Reception of an unelicited Terminate-Ack indicates that the peer
is in the Closed or Stopped states, or is otherwise in need of
re-negotiation.
A summary of the Terminate-Request and Terminate-Ack packet formats ...
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LCP Configuration Options allow negotiation of modifications to the
default characteristics of a point-to-point link. If a Configuration
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... A default is specified for each option which allows the link to
correctly function without negotiation of the option, although
perhaps with less than optimal performance.
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... not looped-back, and that its peer will not be using Magic-
Numbers. In this case, an implementation SHOULD act as if the
negotiation had been successful (as if it had instead received a
Configure-Ack).
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... links
during normal operation, as well as during Configuration Option
negotiation. All LCP Echo-Request, Echo ...
... William Simpson was principally responsible for introducing
consistent terminology and philosophy, and the re-design of the phase
and negotiation state machines.
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