page 1130 OmniSwitch AOS Release 7 Network Configuration Guide March 2011
Activating ICMP Control Messages
ICMP messages are identified by a type and a code. This number pair specifies an ICMP message. For
example, ICMP type 4, code 0, specifies the source quench ICMP message.
To enable or disable an ICMP message, use the icmp type command with the type and code. For exam-
ple, to enable the source quench the ICMP message (type 4, code 0) enter the following:
-> icmp type 4 code 0 enable
To list the ICMP message information use the show icmp control command.
In addition to the icmp type command, several commonly used ICMP messages have been separate CLI
commands for convenience. These commands are listed below with the ICMP message name, type, and
code:
These commands are entered as the icmp type command, only without specifying a type or code. The
echo, timestamp, and address mask commands have options for distinguishing between a request or a
reply, and the unreachable command has options distinguishing between a network, host, protocol, or port.
For example, to enable an echo request message, enter the following:
-> icmp echo request enable
To enable a network unreachable message, enter the following:
-> icmp unreachable net-unreachable enable
Note. Enabling host-unreachable and net-unreachable messages are not recommended as it can cause
the switch instability due to high-CPU conditions depending upon the volume of traffic required by these
messages.
See Chapter 10, “IP Commands,” for specifics on the ICMP message commands.
Enabling All ICMP Types
To enable all ICMP message types, use the icmp messages command with the enable keyword.
For example:
ICMP Message Command
Network unreachable (type 0, code 3) icmp unreachable
Host unreachable (type 3, code 1) icmp unreachable
Protocol unreachable (type 3, code 2) icmp unreachable
Port unreachable (type 3, code 3) icmp unreachable
Echo reply (type 0, code 0) icmp echo
Echo request (type 8, code 0) icmp echo
Timestamp request (type 13, code 0) icmp timestamp
Timestamp reply (type 14, code 0) icmp timestamp
Address Mask request (type 17, code 0) icmp addr-mask
Address Mask reply (type 18, code 0) icmp addr-mask
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