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260 CHAPTER 11: SYSTEM MANAGEMENT
The following list provides the tracert execution process:
1 Tracert sends a packet with TTL value of 1.
2 The first hop sends back an ICMP error message indicating that the packet cannot
be sent, for the TTL is timeout.
3 Re-send the packet with TTL value of 2.
4 The 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.
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
Table 290 The Tracert Command
Operation Command
Trace a route tracert [ -f first-TTL ] [ -m
max-TTL ] [ -p port ] [ -q nqueries
] [ -w timeout ] host