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, and Ethernet and port-channel subinterfaces. The global ICMPv6 adjacency stale timer is configured under system.

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

Diagram

Classes

nxos

Name	Type	Constraint	Mandatory	Default Value
devices	List	devices	No
device_groups	List	device_groups	No
global	Class	global	No
templates	List	templates	No
interface_groups	List	interface_groups	No

nxos

Name	Type	Constraint	Mandatory	Default Value
devices	List	devices	No
device_groups	List	device_groups	No
global	Class	global	No
templates	List	templates	No

devices (nxos)

Name	Type	Constraint	Mandatory	Default Value
configuration	Class	configuration	No

device_groups (nxos)

Name	Type	Constraint	Mandatory	Default Value
configuration	Class	configuration	No

global (nxos)

Name	Type	Constraint	Mandatory	Default Value
configuration	Class	configuration	No

templates (nxos)

Name	Type	Constraint	Mandatory	Default Value
configuration	Class	configuration	No

interface_groups (nxos)

Name	Type	Constraint	Mandatory	Default Value
configuration	Class	configuration	No

configuration (nxos.devices)

Name	Type	Constraint	Mandatory	Default Value
interfaces	Class	interfaces	No
system	Class	system	No
nd	Class	nd	No

configuration (nxos.devices)

Name	Type	Constraint	Mandatory	Default Value
interfaces	Class	interfaces	No
nd	Class	nd	No

configuration (nxos.interface_groups)

Name	Type	Constraint	Mandatory	Default Value
subinterfaces	List	subinterfaces	No
nd	Class	nd	No

interfaces (nxos.devices.configuration)

Name	Type	Constraint	Mandatory	Default Value
loopbacks	List	loopbacks	No
vlans	List	vlans	No
ethernets	List	ethernets	No
port_channels	List	port_channels	No

ethernets (nxos.devices.configuration.interfaces)

Name	Type	Constraint	Mandatory	Default Value
subinterfaces	List	subinterfaces	No
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
subinterfaces	List	subinterfaces	No
nd	Class	nd	No

port_channels (nxos.devices.configuration.interfaces)

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

subinterfaces (nxos.devices.configuration.interfaces.ethernets)

Name	Type	Constraint	Mandatory	Default Value
nd	Class	nd	No

system (nxos.devices.configuration)

Name	Type	Constraint	Mandatory	Default Value
ipv6_adjacency_stale_timer	Integer	min: 30, max: 65535	No
ipv6_adjacency_stale_timer_icmp	Boolean	true, false	No

nd (nxos.devices.configuration)

Name	Type	Constraint	Mandatory	Default Value
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
solicit_na	Choice	none, accept, no-accept	No
solicit_neighbor_advertisement	Boolean	true, false	No
solicit_na_interval	Integer	min: 0, max: 20	No

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

Name	Type	Constraint	Mandatory	Default Value
ra_bootfile_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
dadns_interval	Integer	min: 1000, max: 6000	No
delete_adj_on_mac_delete	Boolean	true, false	No
ra_dns_search_list_suppress	Boolean	true, false	No
ra_dns_server_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
ra_route_suppress	Boolean	true, false	No
router_preference	Choice	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
          solicit_na_interval: 5
          solicit_na: 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

Example 4: ICMPv6 adjacency stale timer

nxos:
  devices:
    - name: LEAF1
      configuration:
        system:
          ipv6_adjacency_stale_timer: 500
          ipv6_adjacency_stale_timer_icmp: true

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
          solicit_na_interval: 5
          solicit_na: 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