Dell N3200-ON EMC Networking N-Series Switches CLI Reference Guide version 6.6 - Page 1560

ipv6 nd nud retry This command configures the exponential backoff multiple to be used in the calculation of the next timeout value for Neighbor Solicitation transmission during NUD (neighbor unreachability detection) following the exponential backoff algorithm. Use the no form of the command to return the backoff multiple to the default. Syntax ipv6 nd nud retry backoff-multiple no ipv6 nd nud retry • backoff-multiple-The value ranges from 1 to 5. The next timeout value is clamped at a maximum value of 60 seconds if the result of the exponential back-off calculation is greater than 60 seconds. Default Configuration The default exponent is 1. Command Mode Global Configuration User Guidelines Once the neighbor is resolved and added in the hardware, traffic is continuously forwarded by the router using neighbor entry. The neighbor entry in the cache transitions to the STALE state after the effective STALE timeout value (a random value between 15 and 45 seconds per RFC 2461). To bridge the gap between the neighbor discovery state and the neighbor cache state, the application periodically iterates through the STALE entries and triggers NUD on those entries to detect any address/station movements or MAC address changes. When NUD is triggered, neighbor solicitation PROBE packets (unicast and multicast) are sent periodically, separated by exponential binary values instead of the normal 1 second interval. This ensures that when the network (not just our router but more routers in the network) is congested, the NUD process for the existing STALE entries takes enough time before ultimately removing the cache entry through garbage collection. Without the Layer 3 Routing Commands 1560