IPv6 Configuration Guide K/KA/KB.15.15

Default: 200 seconds; Range: 3 - 1350 seconds
Setting or changing the hop-limit for host-generated packets
Syntax:
[no] ipv6 nd ra hop-limit 0 - 255
hop-limit
VLAN context command to specify the hop-limit a host includes in the packets
it transmits.
A setting of 0 means the hop-limit is unspecified in the RAs originating on the
current VLAN. In this case, the hop-limit is determined by the host.
The no form of the command resets the hop-limit to zero (unspecified), which
eliminates the hop-limit from the RAs originating on the VLAN or tunnel.
Default: 64; Range: unspecified 0 - 255
Setting or changing the default router lifetime
Syntax:
[no] ipv6 nd ra lifetime 0 - 9000
VLAN or tunnel context command for configuring the lifetime in seconds for the
routing switch to be used as a default router by hosts on the current VLAN. This
setting must be configured to a value greater than or equal to the max-interval
setting.
A given host on a VLAN or tunnel refreshes the default router lifetime for a specific
router each time the host receives an RA from that router. A specific router ceases
to be a default router candidate for a given host if the default router lifetime expires
before the host is updated with a new RA from the router.
A setting of 0 (unspecified) for default router lifetime in an RA indicates that the
routing switch is not a default router on the subject VLAN or tunnel.
Default: 3 times the ra max-interval setting. Range: unspecified 0 - 9000
seconds
Changing the reachable time duration for neighbors
Syntax:
[no] ipv6 nd ra reachable-time [ 1000 - 3600000 | unspecified ]
VLAN or tunnel context command for all hosts on the VLAN or tunnel to configure
as the reachable time duration for a given neighbor after receiving a reachability
confirmation from the neighbor. This value is used to ensure a uniform reachable
time among hosts on the VLAN or tunnel by replacing the individually configured
settings on various hosts on the VLAN.
1000 - 3600000
Reachable time in milliseconds.
unspecified
Configures the reachable time to zero, which disables the reachable-time setting
in RAs on the current VLAN.
The no form also disables the reachable-time setting in RAs on the current VLAN
or tunnel.
Default: unspecified (0); Range: 1000 - 3600000 ms
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