Brocade Communications Systems FastIron SX 1600, Configuration Manual, Page: 62 / 593

• Source-route-fail - The device received a source-routed packet but cannot locate the next-hop IP address indicated in the
packet Source-Route option.
You can disable the Brocade device from sending these types of ICMP messages on an individual basis. To do so, use the following CLI
method.
NOTE
Disabling an ICMP Unreachable message type does not change the Brocade device ability to forward packets. Disabling ICMP
Unreachable messages prevents the device from generating or forwarding the Unreachable messages.
To disable all ICMP Unreachable messages, enter the no ip icmp unreachable command.
device(config)# no ip icmp unreachable
Syntax: [no] ip icmp unreachable { host | protocol | administration | fragmentation-needed | port | source-route-fail }
• If you enter the command without specifying a message type (as in the example above), all types of ICMP Unreachable
messages listed above are disabled. If you want to disable only specific types of ICMP Unreachable messages, you can specify
the message type. To disable more than one type of ICMP message, enter the
no ip icmp unreachable command for each
messages type.
• The host parameter disables ICMP Host Unreachable messages.
• The protocol parameter disables ICMP Protocol Unreachable messages.
• The administration parameter disables ICMP Unreachable (caused by Administration action) messages.
• The fragmentation-needed parameter disables ICMP Fragmentation-Needed But Do not-Fragment Bit Set messages.
• The port parameter disables ICMP Port Unreachable messages.
• The source-route-fail parameter disables ICMP Unreachable (caused by Source-Route-Failure) messages.
To disable ICMP Host Unreachable messages but leave the other types of ICMP Unreachable messages enabled, enter the following
commands instead of the command shown above.
device(config)# no ip icmp unreachable host
If you have disabled all ICMP Unreachable message types but you want to re-enable certain types, for example ICMP Host Unreachable
messages, you can do so by entering the following command.
device(config)# ip icmp unreachable host
Enabling ICMP redirect messages
You can enable and disable IPv4 ICMP redirect messages globally or on individual Virtual Ethernet (VE) interfaces but not on individual
physical interfaces.
NOTE
Some FSX devices do not generate ICMP redirect and network unreachable messages.
NOTE
The device forwards misdirected traffic to the appropriate router, even if you disable the redirect
messages.
By default, IP ICMP redirect over global level is disabled and a Brocade Layer 3 switch does not send an ICMP redirect message to the
source of a misdirected packet in addition to forwarding the packet to the appropriate router. To enable ICMP redirect messages globally,
enter the following command at the global CONFIG level of the CLI:
device(config)# ip icmp redirect
Configuring IP parameters - Layer 3 switches
FastIron Ethernet Switch Layer 3 Routing
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