ND

IPv6 Neighbor Discovery (ND) configuration manages both global ND protocol settings and per-interface ND behavior on NX-OS devices. Global settings control ND packet handling (switch-mode forwarding, fragment drop, queue behavior), static neighbor acceptance, cache management (aging interval, size limits, syslog rate), adjacency route distance, off-list timeout, and solicited neighbor advertisement tuning. Interface-level ND configuration provides per-interface control over Router Advertisement suppression (including MTU suppression), managed/other config flags, DAD attempts and intervals, hop limit, MTU advertisement, NS/RA intervals, reachable time, retransmission timer, MAC extract behavior, DNS suppression, and adjacency lifecycle management across loopback, VLAN, Ethernet, and port-channel interfaces.

Diagram

Classes

configuration (nxos.devices)

Name	Type	Constraint	Mandatory	Default Value
nd	Class	`[nd]`	No

loopbacks (nxos.devices.configuration.interfaces)

Name	Type	Constraint	Mandatory	Default Value
nd	Class	`[nd]`	No

vlans (nxos.devices.configuration.interfaces)

Name	Type	Constraint	Mandatory	Default Value
nd	Class	`[nd]`	No

ethernets (nxos.devices.configuration.interfaces)

Name	Type	Constraint	Mandatory	Default Value
nd	Class	`[nd]`	No

port_channels (nxos.devices.configuration.interfaces)

Name	Type	Constraint	Mandatory	Default Value
nd	Class	`[nd]`	No

nd (nxos.devices.configuration)

Name	Type	Constraint	Mandatory
drop_nd_fragments	Boolean	`true`, `false`	No
queue_packets	Boolean	`true`, `false`	No
allow_static_neighbor_outside_subnet	Boolean	`true`, `false`	No
switch_packets	Choice	`disabled`, `all`, `lla`	No
aging_interval	Integer	min: `300`, max: `65535`	No
cache_limit	Integer	min: `1`, max: `614400`	No
cache_syslog_rate	Integer	min: `1`, max: `1000`	No
adjacency_route_distance	Integer	min: `2`, max: `250`	No
off_list_timeout	Integer	min: `180`, max: `1800`	No
accept_solicit_neighbor_entry	Choice	`none`, `accept`, `no-accept`	No
solicit_neighbor_advertisement	Boolean	`true`, `false`	No
probe_interval_for_solicit_neighbor	Integer	min: `0`, max: `20`	No

nd (nxos.devices.configuration.interfaces.loopbacks)

Name	Type	Constraint	Mandatory
ra_boot_file_url	String		No
suppress_ra	Boolean	`true`, `false`	No
suppress_ra_mtu	Boolean	`true`, `false`	No
managed_config_flag	Boolean	`true`, `false`	No
other_config_flag	Boolean	`true`, `false`	No
redirects	Boolean	`true`, `false`	No
dad_attempts	Integer	min: `0`, max: `15`	No
dad_ns_interval	Integer	min: `1000`, max: `6000`	No
delete_adjacency_on_mac_delete	Boolean	`true`, `false`	No
dns_search_list_suppress	Boolean	`true`, `false`	No
dns_suppress	Boolean	`true`, `false`	No
hop_limit	Integer	min: `0`, max: `255`	No
mac_extract	Choice	`none`, `nud-phase`, `exclude-nud-phase`	No
mtu	Integer	min: `1280`, max: `65535`	No
ns_interval	Integer	min: `1000`, max: `3600000`	No
ra_interval	Integer	min: `4`, max: `1800`	No
ra_interval_minimum	Integer	min: `3`, max: `1350`	No
ra_lifetime	Integer	min: `0`, max: `9000`	No
reachable_time	Integer	min: `0`, max: `3600000`	No
retrans_timer	Integer	min: `0`, max: `4294967295`	No
suppress_ra_route	Boolean	`true`, `false`	No
router_preference	Choice	`unspecified`, `low`, `medium`, `high`	No

Examples

Example 1: Global ND settings with switch-mode packet forwarding and cache tuning

nxos:
  devices:
    - name: LEAF1
      configuration:
        nd:
          switch_packets: all
          drop_nd_fragments: true
          aging_interval: 3600
          cache_limit: 16384
          cache_syslog_rate: 100

Example 2: Interface-level ND with RA suppression on tenant SVIs

nxos:
  devices:
    - name: LEAF1
      configuration:
        interfaces:
          vlans:
            - id: 1010
              vrf: BLUE
              nd:
                suppress_ra: true
                managed_config_flag: true
            - id: 1020
              vrf: GREEN
              nd:
                suppress_ra: true
                managed_config_flag: true

Example 3: Full ND configuration on a border leaf with global and interface-level settings

nxos:
  devices:
    - name: BORDER-LEAF1
      configuration:
        nd:
          switch_packets: all
          drop_nd_fragments: true
          queue_packets: true
          allow_static_neighbor_outside_subnet: true
          aging_interval: 1800
          cache_limit: 32768
          cache_syslog_rate: 50
          adjacency_route_distance: 250
          off_list_timeout: 600
          solicit_neighbor_advertisement: true
          probe_interval_for_solicit_neighbor: 5
          accept_solicit_neighbor_entry: accept
        interfaces:
          vlans:
            - id: 1010
              vrf: BLUE
              nd:
                suppress_ra: true
                suppress_ra_mtu: true
                managed_config_flag: true
                dad_attempts: 1
                hop_limit: 64