Ipv6 Unreachables - Cisco Small Business 300 1.1 Series Administration Manual

IPv6 Addressing Commands
78-20269-01 Command Line Interface Reference Guide
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prefix-length—Specifies the length of the IPv6 prefix. A decimal value
indicates how many of the high-order contiguous bits of the address
comprise the prefix (the network portion of the address). A slash mark (/)
must precede the decimal. Only 64-bit length is supported, according to
IPv6 over Ethernet's well-known practice
Default Configuration
IPv6 is enabled on the interface, link local address of the interface is FE80::EUI64
(interface MAC address).
Command Mode
Interface Configuration (Ethernet, VLAN, Port-channel) mode. It cannot be
configured for a range of interfaces (range context).
User Guidelines
Using the no ipv6 link-local address command removes the manually configured
link local IPv6 address from an interface. Multiple IPv6 addresses can be
configured per interface, but only one link-local address. When the no ipv6
link-local address command is used, the interface is reconfigured with the
standard link local address (the same IPv6 link-local address that is set
automatically when the enable ipv6 command is used). The system automatically
generates a link-local address for an interface when IPv6 processing is enabled on
the interface. To manually specify a link-local address to be used by an interface,
use the ipv6 link-local address command. The system supports only 64 bits prefix
length for link-local addresses.
Example
console(config)# interface vlan 1
console(config-if)# ipv6 address fe80::123/64 link-local
36.7

ipv6 unreachables

Use the ipv6 unreachables Interface Configuration mode command to enable 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
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