ECS4660-28F_Management Guide-R03

C HAPTER 49 | IP Interface Commands
IPv6 Interface
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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.
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
0 milliseconds is advertised in router advertisements
COMMAND MODE
Interface Configuration (VLAN)
COMMAND USAGE
◆ 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.
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)#