222 IP Addressing Commands
Example
The following example assigns FE80::260:3EFF:FE11:6770 as the link-local address.
ipv6 unreachables
The ipv6 unreachables Interface Configuration mode command enables the generation of Internet
Control Message Protocol for IPv6 (ICMPv6) unreachable messages for any packets arriving on a
specified interface. Use the no form of this command to prevent the generation of unreachable messages.
Syntax
• ipv6 unreachables
• no ipv6 unreachables
Default Configuration
ICMP unreachable messages are sent by default.
Command Mode
Interface configuration mode (Ethernet, VLAN, Port-channel).
User Guidelines
• If a packet addressed to one of the interface's IP address with TCP/UDP port not assigned is received,
and ICMP unreachable messages is enabled, the device sends an ICMP unreachable message. To
disable sending ICMP unreachable messages on the interface, use the
no ipv6 unreachables
command
Example
The following example enables the generation of Internet Control Message Protocol for IPv6 (ICMPv6)
unreachable messages for any packets arriving on interface g1.
ipv6 default-gateway
The ipv6 default-gateway Global Configuration mode command defines an IPv6 default gateway. Use
the no form of this command to remove the default gateway.
Console# Console (config)# interface g1
Console (config-if)# ipv6 address FE80::260:3EFF:FE11:6770 link-
local
Console# Console (config)# interface g1
Console (config-if)# ipv6 unreachables
5400_CLI.book Page 222 Wednesday, December 17, 2008 4:33 PM
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