3Com 10014298 manual Tracert Command, Operation Command Trace a route, Tracert -f first-TTL -m

260CHAPTER 11: SYSTEM MANAGEMENT

The following list provides the tracert execution process:

1Tracert sends a packet with TTL value of 1.

2The first hop sends back an ICMP error message indicating that the packet cannot be sent, for the TTL is timeout.

3Re-send the packet with TTL value of 2.

4The second hop returns the TTL timeout message.

The process is repeated until the packet reaches the destination. The process is to record the source address of each ICMP TTL timeout message to provide the route of an IP packet to the destination.

Perform the following operation in user view.

Table 290 The Tracert Command

Operation	Command
Trace a route	tracert [ -ffirst-TTL ] [ -m
	max-TTL ] [ -pport ] [ -qnqueries
	] [ -wtimeout ] host

Logging Function The Syslog is an indispensable part of the Switch 7750. It serves as an information center of the system software modules. The logging system is responsible for most of the information output, and also to make detailed classification to filter the information efficiently. Coupled with the debugging program, the syslog provides powerful support for the network administrators to monitor the operational state of networks and to diagnose network failures.

The syslog of the Switch 7750 has the following features:

■Support for six different output destinations: console, monitor to Telnet terminal, log buffer, loghost, trap buffer, and SNMP.

■The log is divided into 8 levels according to the significance of the event, and it can be filtered based on the levels.

■The information can be classified in terms of the source modules, and the information can be filtered by module.

■The output language can be selected between English and Chinese.

SYSLOG configuration includes tasks described in the following sections:

■Enabling and Disabling the Logging Function

■Setting the Output Channel of the Log

■Defining the Log Filtering Rules

■Configuring the SNMP Timestamp Output Format

■Configuring the Info-center Loghost

■Displaying and Debugging the Syslog Function