189
{ The received packet does not match any route.
{ No default route exists in the routing table.
• The device sends the source an ICMP protocol unreachable message when the following
conditions are met:
{ The received packet is destined for the device.
{ The transport layer protocol of the packet is not supported by the device.
• The device sends the source an ICMP port unreachable message when the following
conditions are met:
{ The received UDP packet is destined for the device.
{ The packet's port number does not match the running process.
• The device sends the source an ICMP source route failed message when the following
conditions are met:
{ The source uses Strict Source Routing to send packets.
{ The intermediate device finds that the next hop specified by the source is not directly
connected.
• The device sends the source an ICMP fragmentation needed and DF set message when the
following conditions are met:
{ The MTU of the sending interface is smaller than the packet.
{ The packet has Don't Fragment set.
Examples
# Enable sending ICMP destination unreachable messages.
<Sysname> system-view
[Sysname] ip unreachables enable
reset ip statistics
Use reset ip statistics to clear IP traffic statistics.
Syntax
reset ip statistics [ slot slot-number ]
Views
User view
Predefined user roles
network-admin
Parameters
slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a member
device, this command clears IP traffic statistics for all member devices.
Usage guidelines
Use this command to clear history IP traffic statistics before you collect IP traffic statistics for a time
period.
Examples
# Clear IP traffic statistics.
<Sysname> reset ip statistics
Related commands
display ip interface