Brocade 6910 Ethernet Access Switch Configuration Guide (Supporting R2.2.0.0) User Manual
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Brocade 6910 Ethernet Access Switch Configuration Guide
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IPv6 Interface
•
Duplicate address detection determines if a new unicast IPv6 address already exists on the
network before it is assigned to an interface.
•
Duplicate address detection is stopped on any interface that has been suspended (see the
command). While an interface is suspended, all unicast IPv6 addresses assigned to that
interface are placed in a “pending” state. Duplicate address detection is automatically
restarted when the interface is administratively re-activated.
•
An interface that is re-activated restarts duplicate address detection for all unicast IPv6
addresses on the interface. While duplicate address detection is performed on the interface’s
link-local address, the other IPv6 addresses remain in a “tentative” state. If no duplicate
link-local address is found, duplicate address detection is started for the remaining IPv6
addresses.
•
If a duplicate address is detected, it is set to “duplicate” state, and a warning message is sent
to the console. If a duplicate link-local address is detected, IPv6 processes are disabled on the
interface. If a duplicate global unicast address is detected, it is not used. All configuration
commands associated with a duplicate address remain configured while the address is in
“duplicate” state.
•
If the link-local address for an interface is changed, duplicate address detection is performed
on the new link-local address, but not for any of the IPv6 global unicast addresses already
associated with the interface.
Example
The following configures five neighbor solicitation attempts for addresses configured on VLAN 1.
The
command indicates that the duplicate address detection process is still
on-going.
Console(config)#interface vlan 1
Console(config-if)#ipv6 nd dad attempts 5
Console(config-if)#end
Console#show ipv6 interface
VLAN 1 is up
IPv6 is enabled
Link-local address:
FE80::200:E8FF:FE90:0/64
Global unicast address(es):
2009:DB9:2229::79, subnet is 2009:DB9:2229:0::/64
Joined group address(es):
FF01::1/16
FF02::1/16
FF02::1:FF00:79/104
FF02::1:FF90:0/104
IPv6 link MTU is 1500 bytes
ND DAD is enabled, number of DAD attempts: 5.
ND retransmit interval is 1000 milliseconds
ND advertised retransmit interval is 0 milliseconds
ND reachable time is 30000 milliseconds
ND advertised reachable time is 0 milliseconds
Console#
Related Commands
“ipv6 nd ns-interval” on page 625
“show ipv6 neighbors” on page 626