Reference Guide

IPv6 Commands 705
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Default Keyword
The default keyword can be used to set default values for automatic
advertised prefixes configured as addresses on the interface using the ipv6
address command.
Note. These default values are not used as the default values in the ipv6 nd
prefix command.
Use the no ipv6 nd prefix default command to return the default values to
the original default values.
On-Link
When on-link is “on” (by default), the specified prefix is assigned to the link.
Nodes sending traffic to such addresses that contain the specified prefix
consider the destination to be locally reachable on the link. An on-link prefix
is inserted into the routing table as a Connected prefix.
Auto-configuration
When auto-configuration is on (by default), it indicates to hosts on the local
link that the specified prefix can be used for IPv6 auto-configuration.
The configuration options affect the L-bit and A-bit settings associated with
the prefix in the IPv6 ND Router Advertisement, and presence of the prefix in
the routing table, as follows:
• Default L=1 A=1, In the Routing Table
•
no-onlink L=0 A=1, In the Routing Table
•
no-autoconfig L=1 A=0, In the Routing Table
•
no-onlink no-autoconfig L=0 A=0, In the Routing Table
•
off-link L=0 A=1, Not in the Routing Table
•
off-link no-autoconfig L=0 A=0, Not in the Routing Table
Example
Example 1. The following example includes the IPv6 prefix 2001:0DB8::/35 in
router advertisements sent out VLAN 1 with a valid lifetime of 1000 seconds
and a preferred lifetime of 900 seconds. The prefix is inserted in the Routing
table:
console(config)# interface vlan 1