Edge-Core ECS4810-12M Layer 2, Management Manual

Page: 1189 / 1236

C
HAPTER
45
| IP Interface Commands
IPv6 Interface
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D
EFAULT
S
ETTING
1
C
OMMAND
M
ODE
Interface Configuration (VLAN)
C
OMMAND
U
SAGE
◆
Configuring a value of 0 disables duplicate address detection.
◆
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
vlan 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.
E
XAMPLE
The following configures five neighbor solicitation attempts for addresses
configured on VLAN 1. The show ipv6 interface 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