Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 470)

442 Multi-Service IronWare Routing Configuration Guide
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Configuring IPv6 ICMP
Use the no parameter in front of the ipv6 icmp unreachable address command to disable the
sending of ICMPv6 destination unreachable messages with the code is address unreachable.
Enabling ICMP messages for an unreachable route
By default, the ICMPv6 destination unreachable messages with the code for an unreachable route
are not sent for a discarded IPv6 packet. You can enable the sending of these messages by using
the ipv6 icmp unreachable route command.
For example, to enable ICMPv6 error messages for unreachable route on the current device, enter
the following command.
Brocade(config)# ipv6 icmp unreachable route
Syntax: [no] ipv6 icmp unreachable route
Use the no parameter in front of the ipv6 icmp unreachable route command to disable the sending
of ICMPv6 destination unreachable messages with the code for destination unreachable.
Enabling ICMP error messages for IPv6 packets with
hop-limit 0
By default, a Brocade MLX\XMR series box does not respond to an IPv6 packet with hop-limit 0,
and drops it at the hardware. You can enable or disable a device to respond to such packets with a
proper ICMPv6 error message using the ipv6 icmp hop-limit-zero command from the global config
mode.
NOTE
This command is available only on Brocade MLX\XMR series routers.
For example, to enable ICMPv6 error messages for IPv6 routed packets with hop-limit 0, enter the
following command:
Brocade(config)#ipv6 icmp hop-limit-zero
Syntax: [no] ipv6 icmp hop-limit-zero
Use the show running-configuration command to see if this is enabled or disabled. Use the no
parameter in front of the ipv6 icmp hop-limit-zero command to disable the sending of ICMP error
messages for IPv6 Routed packet with hop-limit 0.
Enabling ICMP error messages for multicast Too Big packets
By default, the brocade box will not send an ICMPv6 Packet Too Big error message for the multicast
packets. You can enable or disable (default behavior) a device to send the ICMPv6 Packet Too Big
error messages for the IPv6 packets sent to multicast address destination using the ipv6 icmp
packet-too-big-for-multicast command from the global config mode.
NOTE
This command is available on Brocade MLX\XMR and CES\CER series boxes.