Disabling Icmp Redirects; Configuring Static Routes - Foundry Networks Switch and Router Installation And Configuration Manual

• The administration parameter disables ICMP Unreachable (caused by Administration action) messages.
• The fragmentation-needed parameter disables ICMP Fragmentation-Needed But Don't-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 and ICMP Network Unreachable messages but leave the other
types of ICMP Unreachable messages enabled, enter the following commands instead of the command shown
above:
BigIron(config)# no ip icmp unreachable host
BigIron(config)# no ip icmp unreachable network
If you have disabled all ICMP Unreachable message types but you want to re-enable certain types, you can do so
entering commands such as the following:
BigIron(config)# ip icmp unreachable host
BigIron(config)# ip icmp unreachable network
The commands shown above re-enable ICMP Unreachable Host messages and ICMP Network Unreachable
messages.
USING THE WEB MANAGEMENT INTERFACE
You cannot disable ICMP Destination Unreachable messages using the Web management interface.

Disabling ICMP Redirects

You can disable ICMP redirects on a global basis or on an individual port basis. To disable ICMP redirects
globally, enter the following command at the global CONFIG level of the CLI:
BigIron(config)# no ip icmp redirects
Syntax: [no] ip icmp redirects
To disable ICMP redirects on a specific interface, enter the same command at the configuration level for the
interface:
BigIron(config)# int e 3/11
BigIron(config-if-e100-3/11)# no ip redirect
Syntax: [no] ip redirect

Configuring Static Routes

The IP route table can receive routes from the following sources:
• Directly-connected networks – When you add an IP interface, the Layer 3 Switch automatically creates a
route for the network the interface is in.
• RIP – If RIP is enabled, the Layer 3 Switch can learn about routes from the advertisements other RIP routers
send to the Layer 3 Switch. If the route has a lower administrative distance than any other routes from
different sources to the same destination, the Layer 3 Switch places the route in the IP route table.
• OSPF – See RIP, but substitute "OSPF" for "RIP".
• BGP4 – See RIP, but substitute "BGP4" for "RIP".
• Default network route – A statically configured default route that the Layer 3 Switch uses if other default
routes to the destination are not available. See "Configuring a Default Network Route" on page 15-49.
• Statically configured route – You can add routes directly to the route table. When you add a route to the IP
route table, you are creating a static IP route. This section describes how to add static routes to the IP route
table.
December 2000
Configuring IP
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