H3C Technologies H3C S10500 Series Switches - Manual (Page 106)

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Table 6 Handling ICMP messages
Device mode ICMP messages sent ICMP messages received Remarks
Common mode Common ICMP messages Common ICMP messages
Extension information in
extended ICMP messages
will not be processed.
Compliant mode
Common ICMP messages
Extended ICMP messages
with a length field
Common ICMP messages
Extended ICMP messages
with a length field
Extended ICMP messages
without a length field are
handled as common ICMP
messages.
Non-compliant
mode
Common ICMP messages
Extended ICMP messages
without a length field
All three types of ICMP
messages
—
NOTE:
ICMP/ICMPv6 messages that can carry extension information include only IPv4 redirect messages,
IPv4/IPv6 time exceeded messages, and IPv4/IPv6 destination unreachable messages.
Configuration procedure
Follow these steps to enable support for ICMP extensions:
To do… Use the command… Remarks
Enter system view system-view —
Enable support for ICMP
extensions in compliant mode
ip icmp-extensions compliant
Optional
Disabled by default.
Enable support for ICMP
extensions in non-compliant mode ip icmp-extensions non-compliant Optional
Disabled by default.
NOTE:
After support for ICMP extensions is disabled, no ICMP message sent by the device contains extension
information.
Displaying and maintaining IP performance
optimization
To do… Use the command… Remarks
Display TCP connection statistics
display tcp statistics [ | { begin | exclude |
include } regular-expression ]
Available in any view
Display UDP statistics
display udp statistics [ | { begin | exclude |
include } regular-expression ]
Available in any view
Display statistics of IP packets (in
standalone mode)
display ip statistics [ slot slot-number ] [ |
{ begin | exclude | include }
regular-expression ]
Available in any view