System Maintenance And Debugging - 3Com 4210G Series Configuration Manual

21

System Maintenance and Debugging

When maintaining and debugging the system, go to these sections for information you are interested
in:
System Maintenance and Debugging
Ping
Tracert
System Debugging
Ping and Tracert Configuration Example
System Maintenance and Debugging
You can use the ping command and the tracert command to verify the current network connectivity,
and use the debug command to enable debugging and thus to diagnose system faults based on the
debugging information.
Ping
Introduction
You can use the ping command to verify whether a device with a specified address is reachable, and
to examine network connectivity.
The ping function is implemented through the Internet Control Message Protocol (ICMP):
1) The source device sends an ICMP echo request to the destination device.
2) The source device determines whether the destination is reachable based on whether it receives
an ICMP echo reply; if the destination is reachable, the source device determines the link quality
based on the numbers of ICMP echo requests sent and replies received, determines the distance
between the source and destination based on the round trip time of ping packets.
Configuring Ping
Follow the step below to configure the ping function:
To do...
Check
whether a
specified
address in an
IP network is
reachable
Use the command...
ping [ ip ] [ -a source-ip | -c count | -f | -h ttl | -i
interface-type interface-number | -m interval | -n |
-p pad | -q | -r | -s packet-size | -t timeout | -tos tos
| -v | -vpn-instance vpn-instance-name ] * host
ping ipv6 [ -a source-ipv6 | -c count | -m interval |
-s packet-size | -t timeout ] * host [ -i interface-type
interface-number ]
21-1
Remarks
Required
Use either approach
The ping command is
applicable in an IPv4
network; the ping ipv6
command is applicable in an
IPv6 network.
Available in any view