CLI Reference Guide

Table Of Contents
Chapter 28
| IP Interface Commands
IPv6 Interface
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possibly malicious attacks on the 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.
Example
Console(config)#interface ethernet 1/1
Console(config-if)#ipv6 nd raguard
Console(config-if)#
show ipv6 nd raguard This command displays the configuration setting for RA Guard.
Syntax
show ipv6 nd raguard [interface]
interface
ethernet unit/port
unit - Unit identifier. (Range: 1)
port - Port number. (Range: 1-54)
port-channel channel-id (Range: 1-26)
Command Mode
Privileged Exec
Example
Console#show ipv6 nd raguard interface ethernet 1/1
Interface RA Guard
--------- --------
Eth 1/ 1 Yes
Console#
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)