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network, may lead to bogus RAs being sent, which in turn can cause
operational problems for hosts on the network.
This command can be used to block RAs and Router Redirect (RR)
◆
messages on the specified interface. Determine which interfaces are
connected to known routers, and enable RA Guard on all other
untrusted interfaces.
E
XAMPLE
Console(config)#interface ethernet 1/1
Console(config-if)#pv6 nd raguard
Console(config-if)#
This command configures the amount of time that a remote IPv6 node is
ipv6 nd
considered reachable after some reachability confirmation event has
reachable-time
occurred. Use the no form to restore the default setting.
S
YNTAX
ipv6 nd reachable-time milliseconds
no ipv6 nd reachable-time
D
EFAULT
30000 milliseconds is used for neighbor discovery operations
0 milliseconds is advertised in router advertisements
C
OMMAND
Interface Configuration (VLAN)
C
OMMAND
The time limit configured by this command allows the router to detect
◆
unavailable neighbors.
This time limit is included in all router advertisements sent out through
◆
an interface, ensuring that nodes on the same link use the same time
value.
Setting the time limit to 0 means that the configured time is
◆
unspecified by this router.
E
XAMPLE
The following sets the reachable time for a remote node to 1000
milliseconds:
Console(config)#interface vlan 1
Console(config)#pv6 nd reachable-time 1000
Console(config)#
milliseconds - The time that a node can be considered reachable
after receiving confirmation of reachability. (Range: 0-3600000)
S
ETTING
M
ODE
U
SAGE
– 1689 –
| IP Interface Commands
C
49
HAPTER
IPv6 Interface
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