H3C Technologies H3C SecBlade NetStream Cards - Manual (Page 268)

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System maintenance and debugging
This chapter includes these sections:
• Ping
• Tracert
• System debugging
• Ping and tracert configuration example
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
The ping command allows you 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… Use the command… Remarks
Check whether a
specified address in an
IP network is reachable
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 ] * host
Required
The ping command is
applicable in an IPv4 network.
NOTE:
•
For a low-speed network, you are recommended to set a larger value for the timeout timer (indicated by
the -t parameter in the command) when configuring the ping command.
• Only the directly connected segment address can be pinged if the outgoing interface is specified with
the -i keyword.