Enterasys Networks CSX6000 - Manual (Page 552)

USER’S GUIDE
552 CyberSWITCH
PPP P
ACKET
T
RACE
M
ESSAGES
PPP Packet Trace allows you to display the PPP protocol negotiation that takes place when a link
is established. This information is useful when diagnosing mismatches in configuration between
two systems. PPP Packet Trace puts PPP packet information into the Report log, which can be
accessed by using the
dr command. Enable this feature by using the trace ppp on command,
and disable it with trace ppp off. Two other commands are also available, trace ppp np
and trace ppp cp . trace ppp np only enables the tracing of Network Protocol packets
received and sent by the system. When the trace ppp np command is used, no Control Protocol
packets will be reported to the system message log. trace ppp cp only enables the tracing of
Control Protocol packets received and sent by the system. When the trace ppp cp command is
used, no Network Protocol packets will be reported to the system message log.
The following is the format of a PPP trace line as it is displayed by dr :
[connection Id] [packet direction] [protocol type] [packet type]
where:
[connection Id]
Identifies the connection. The Id is a numerical value, allowing you to distinguish
connections. The numerical value represents the order in which the connections are
generated.
[packet direction]
Indicates the packet direction. IN means received packet, OUT means transmitted packet.
[protocol type]
Indicates the type of protocol used for negotiation. When a connection is made between
two devices, there are three different phases. The last two phases deal with the protocol
type and the options negotiated.
The following table summarizes the protocol types:
[packet type]
A code field that indicates the type of command that the packet contains. PPP Control
Protocol negotiation uses the following commands:
Protocol Options Negotiated
Link Control
Protocol Authentication Protocol (PAP,CHAP)
Multilink Protocol (MRRU, Endpoint
Discriminator)
PAP
CHAP Password validation
Shared Secret validation
Compression
(CCP)
Encryption
(ECP)
IPCP
BCP
IPXCP
ATCP Compression options
Encryption options
IP address
Bridge options
IPX options
Appletalk options