Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 469)

Multi-Service IronWare Routing Configuration Guide 441
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Configuring IPv6 ICMP
Disabling or re-enabling ICMP redirect messages
You can disable or re-enable a device to transmit ICMP redirect messages from an interface. By
default, a device sends an ICMP redirect message to a neighboring host to inform it of a better
first-hop device on a path to a destination. No further configuration is required to enable the
sending of ICMP redirect messages. (For more information about how ICMP redirect messages are
implemented for IPv6, refer to
“Configuring IPv6 neighbor discovery” on page 443.)
For example, to disable the ICMP redirect messages from Ethernet interface 3/1, enter the
following commands.
Brocade(config)# interface ethernet 3/1
Brocade(config-if-e100-3/1)# no ipv6 redirects
Syntax: [no] ipv6 redirects
To re-enable the sending of ICMP redirect messages on Ethernet interface 3/1, enter the following
commands.
Brocade(config)# interface ethernet 3/1
Brocade(config-if-e100-3/1)# ipv6 redirects
Use the show ipv6 interface interface port-number command to verify that the sending of ICMP
redirect messages is enabled on a particular interface.
Disabling ICMP error messages for source-routed
IPv6 packets
By default, ICMP error messages are transmitted to announce discarded IPv6 source-routed
packets that were addressed to one of the IPv6 addresses of a device. By default, these packets
are discarded in software, as described in
“Software filtering of IPv6 source-routed packets” on
page 451.
You can disable or re-enable the sending of ICMP error messages for discarded, IPv6 source-routed
packets by using the ipv6 icmp source-route command. Use the no form of this command to
disable the transmission of these error messages. The following example illustrates the disabling
operation.
Brocade(config)# no ipv6 icmp source-route
Syntax: [no] ipv6 icmp source-route
Enabling ICMP error messages for an unreachable address
By default, the ICMPv6 destination unreachable messages with the code for an unreachable
address are not sent for a discarded IPv6 packet. You can enable the sending of these messages
by using the ipv6 icmp unreachable address command. This command applies globally.
For example, to enable ICMPv6 error messages for unreachable address on the current device,
enter the following command.
Brocade(config)# ipv6 icmp unreachable address
Syntax: [no] ipv6 icmp unreachable address