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PPP protocol values are all assigned such that the upper byte of
the protocol is an even value and the lower byte is an odd value (a
limited use of the more generalized mechanism described by the
ISO 3309 extension mechanism for address fields). Thus, the
receiver can readily detect when the leading byte of a protocol
value has been omitted (the first byte of the protocol field is odd
rather than even), so there is no ambiguity interpreting frames in
the presence of PFC.
PFC, like ACFC, is a receive side capability and the previous
description of ACFC applies to PFC.
Example:
set lcp parameters
Config tries [20]?
NAK tries [10]?
Terminate tries [10]?
Retry timer (mSec) [3000]?
Note: The value immediately following the command option prompt is the
current setting of that option. It is not always the default value
illustrated in this chapter.
Retry timer
Sets the amount of time in milliseconds that elapses before LCP’s
transmission of configure-request (to open the link) and
terminate-request (to close the link) packets is timed out. Expiration
of this timer causes a timeout and the halting of configure-request
and terminate-request packet transmission. The range is 200 to
30000 milliseconds. The default setting is 3000 milliseconds.
Config tries
Sets the number of times that LCP sends configure-request packets
to a peer station to establish the opening of a PPP link. The default
value is 20. The range is 1 to 100.
The retry timer starts after the first configure-request packet is
transmitted. This is done to guard against packet loss.
NAK tries
Sets the number of times that LCP sends configure-nak (nak = not
acknowledged) packets to a peer station while attempting to open a
PPP link. The default value is 10. The range is 1 to 100.
LCP sends configure-nak packets upon receiving configure-request
packets with some unacceptable configuration options. These
packets are sent to refuse the offered configuration options and to
suggest modified, acceptable values.
Terminate tries
Sets the number of times that LCP sends terminate-request packets
to a peer station to close a PPP link. The default value is 10. The
range is 1 to 100.
The retry timer starts after the first terminate-request packet is
transmitted. This is done to guard against packet loss.
name Sets the name that the router uses when responding to authentication
requests from another router.
Configuring PPP Interfaces (Talk 6)
Chapter 33. Configuring and Monitoring Point-to-Point Protocol Interfaces 481
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