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Command Reference Guide
Ethernet Interface Command Set
The optional off-link parameter sets the L flag (on-link flag) value to 0 in RA messages. When the L flag is
set to 0, the advertisement makes no statement about on-link or off-link properties of the prefix. When the
L flag is set, the prefix is considered on-link and locally reachable by hosts on the link (meaning a router is
not needed). Hosts attached to the link will add on-link prefixes to their prefix list or route table. When
off-link is not specified, a connected route is added to the route table of this router for this prefix. When
off-link is specified, no route is added to the route table. By default, prefixes are advertised as on-link with
the L flag set to 1.
The optional no-rtr-address parameter sets the R flag (router flag) of the RA to 0 and does not include the
full router address in the advertisement. The router address is typically included in the RA to assist in
Mobile IP environments. By default, the R flag is set to 1 and the router address is sent in RA messages.
The optional no-autoconfig parameter sets the A flag of the RA to 0, indicating that hosts may not create
an address for this prefix using SLAAC. If the A flag is set to 1 (the default setting), hosts perform SLAAC
to generate an address based on the prefix. This parameter only affects hosts receiving the RA, it does not
effect the operation of the local router.
The optional no-advertise parameter specifies that the prefix is excluded from RA messages. By default,
the prefix is included in RA messages. The no-onlink parameter informs the router that the prefix is not to
be used for on-link determination.
By default, all prefixes derived from the interface's configured IPv6 addresses are advertised using the
system default values.
Usage Examples
The following example specifies that the IPv6 prefix 2001:DB8:3F::/48 has an infinite valid and preferred
lifetime advertised in RA messages sent from the interface:
(config)#interface ethernet 0/1
(config-eth 0/1)#ipv6 nd prefix 2001:DB8:3F::/48 infinite infinite
The following example changes the default values and behaviors of prefixes included in RA messages to
infinite valid and preferred lifetimes, and specifies that the on- or off-link state of the prefix is not included in
the RA and that hosts receiving the RA may not use the prefix for creating an IPv6 address:
(config)#interface ethernet 0/1
(config-eth 0/1)#ipv6 nd prefix default infinite infinite off-link no-autoconfig
60000CRG0-35E
Copyright © 2012 ADTRAN, Inc.
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