Disabling icmp redirect messages, Configuring static routes – Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) User Manual
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Multi-Service IronWare Switching Configuration Guide
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Configuring static routes
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Disabling ICMP redirect messages
ICMP redirect messages can be disabled or re-enabled. By default, the Brocade device sends an
ICMP redirect message to the source of a misdirected packet in addition to forwarding the packet
to the appropriate router. You can disable ICMP redirect messages on a global basis or on an
individual port basis.
NOTE
An unusually high receipt of multiple Internet Control Message Protocol (ICMP) Redirect packets that
are used to change routing table entries in a short period of time may cause high CPU utilization.
This can be avoided by configuring the maximum ICMP error message rate using ip icmp
max-err-msg-rate command, 0 (minimum) to 5000 (maximum) error message per second. The
default value is 400.The total error rate for all IP interfaces (SYSTEM) is 10,000 errors per second.
NOTE
The device forwards misdirected traffic to the appropriate router, even if you disable the redirect
messages.
To disable ICMP redirect messages globally, enter the following command at the global CONFIG
level of the CLI.
NOTE
The ip icmp redirects command is applicable to the Brocade MLX Series and NetIron XMR Series
devices only.
Brocade(config)# no ip icmp redirects
Syntax: [no] ip icmp redirects
To disable ICMP redirect messages on a specific interface, enter the following command at the
configuration level for the interface.
Brocade(config)# int e 3/11
Brocade(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 Brocade device automatically
creates a route for the network the interface is in.
•
RIP – If RIP is enabled, the Brocade device can learn about routes from the advertisements
other RIP routers send to the Brocade device. If the route has a lower administrative distance
than any other routes from different sources to the same destination, the Brocade device
places the route in the IP route table.
•
OSPF – Refer to RIP, but substitute “OSPF” for “RIP”.
•
BGP4 – Refer to RIP, but substitute “BGP4” for “RIP”.
•
Default network route – A statically configured default route that the Brocade device uses if
other default routes to the destination are not available. Refer to