Chapter 26
| IP Interface Commands
Neighbor Discovery
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malicious attacks on the network, may lead to bogus RAs being sent, which in
turn can cause operational problems for hosts on the network.
â—† 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.
Example
Console(config)#interface ethernet 1/1
Console(config-if)#pv6 nd raguard
Console(config-if)#
ipv6 nd
reachable-time
This command configures the amount of time that a remote IPv6 node is
considered reachable after some reachability confirmation event has occurred. Use
the no form to restore the default setting.
Syntax
ipv6 nd reachable-time milliseconds
no ipv6 nd reachable-time
milliseconds - The time that a node can be considered reachable after
receiving confirmation of reachability. (Range: 0-3600000)
Default Setting
30000 milliseconds is used for neighbor discovery operations
Command Mode
Interface Configuration (VLAN)
Command Usage
â—† The time limit configured by this command allows the router to detect
unavailable neighbors.
Example
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)#
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