Bay Networks 6300 Supplement Manual page 137

Book A
Magic Numbers
Link Quality
Monitoring (LQM)
Protocol Field
Compression
(PFC)
Address and
Control Field
Compression
(AACFC)
Remote Annex 6300 Supplement to the Remote Annex Administrator's Guide for UNIX
Since the output flow control parameters are outside the range 0–31
decimal, they do not affect the ACCM.
The na/admin command show port ppp_acm still displays the
ppp_acm setting. The CLI command netstat –ipnn, where nn is the
port number, displays the true mask (ACCM) value, i.e., the value
negotiated between the two PPP processes.
The Magic Number option detects data-link anomalies, namely loopback.
The RA 6300 always requests this option by sending a random 4-byte
word out as its Magic Number in an LCP Configure Request.
The RA 6300 will not request LQM. It rejects any attempts by the remote
peer for LQM and hints for the PPP default of none.
PFC compresses the two-byte Asynchronous HDLC protocol field to one
byte. The RA 6300 always requests and accepts PFC from the peer. If
NAKed, it accepts the PPP default of off. If the peer does not request
PFC, the RA 6300 hints for PFC on. If the peer NAKs this hint, the
RA 6300 accepts PFC off.
ACFC deletes non-ambiguous constant address and control fields in the
Asynchronous HDLC headers. The RA 6300 always requests, and
accepts, ACFC. If NAKed, it accepts the PPP default of off. If the peer
requests ACFC off, the RA 6300 hints for ACFC on. If the peer NAKs
this hint, the RA 6300 accepts ACFC off.
Chapter 6 Point-to-Point Protocol (PPP)
A-109