Managing IP
Configuring IP
page 15-30
OmniSwitch AOS Release 7 Network Configuration Guide
June 2013
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
command with the type and code. For
example, 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
command, many commonly used ICMP messages have separate CLI
commands for convenience. The following table lists the ICMP message name, type, and code:
These commands are entered as the
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
for specifics on the ICMP message commands.
ICMP Message
Command
Network unreachable (type 0, code 3)
Host unreachable (type 3, code 1)
Protocol unreachable (type 3, code 2)
Port unreachable (type 3, code 3)
Echo reply (type 0, code 0)
Echo request (type 8, code 0)
Timestamp request (type 13, code 0)
Timestamp reply (type 14, code 0)
Address Mask request (type 17, code 0)
Address Mask reply (type 18, code 0)
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