Configuring IPv6 Configuring Neighbor Unreachability Detection
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 page 17-26
Configuring Neighbor Unreachability Detection
To specify the maximum number of neighbor solicitations to be sent during the Neighbor Unreachability
Detection (NUD) process, use the ipv6 interface command with the retrans-max parameter. For
example:
-> ipv6 interface vlan_1 retrans-max 5
This example sets the maximum number of neighbor solicitations to 5 for the “vlan_1” interface.
To modify the fixed interval at which the neighbor solicitations are sent during the NUD process, use the
ipv6 interface command with retrans-timer parameter. For example:
-> ipv6 interface vlan_1 retrans-timer 3000
This example sets the interval between neighbor solicitations to 3 seconds (3000 ms) for the “vlan_1”
interface.
To enable using an exponentially increasing interval between the neighbor solicitations sent during the
NUD process, use the ipv6 interface command with retrans-backoff' parameter. The interval between
subsequent neighbor solicitations will be calculated using the formula, NS interval = ib
n
, where,
i = the retransmit interval (retrans-timer)
b = the retransmit backoff (retrans-backoff)
n = the current neighbor solicitation number (starting at 0 for the first transmit)
For example:
-> ipv6 interface vlan_1 retrans-max 5 retrans-timer 1000 retrans-backoff 3
This example results in up to 5 neighbor solicitations being sent during the NUD process with intervals of
1, 3, 9, and 27 seconds.
Note. The retrans-max and retrans-timer options also affect neighbor solicitations sent during the initial
neighbor discovery process when attempting to resolve a new address. However, the exponential backoff
(retrans-backoff) does not apply to initial neighbor discovery.
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