Cabletron Systems CSX1200, CSX1000 manual PPP Packet Trace Messages

TRACE MESSAGES

PPP Packet Trace Messages

PPPPACKET TRACE MESSAGES

PPPPacket 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:

Protocol	Options Negotiated
Link Control	Authentication Protocol (PAP,CHAP)
Protocol	Multilink Protocol (MRRU, Endpoint
	Discriminator)
PAP	Password validation
CHAP	Shared Secret validation
Compression	Compression options
(CCP)	Encryption options
Encryption	IP address
(ECP)	Bridge options
IPCP	IPX options
BCP	Appletalk options
IPXCP
ATCP

[packet type]

A code field that indicates the type of command that the packet contains. PPP Control Protocol negotiation uses the following commands:

Workgroup Remote Access Switch 495