Neighbor Discovery

nv set interface <interface-id> neighbor ipv6 <address> lladdr <lladdr-id>

Configures a static ARP table entry for an interface with an IPv6 address associated with a MAC address for easy management or as a security measure to prevent spoofing and other nefarious activities.

Command Syntax

Version History

Introduced in Cumulus Linux 5.7.0

Example

cumulus@switch:~$ nv set interface swp51 neighbor ipv6 fe80::4ab0:2dff:fea2:4c79 lladdr 00:00:5E:00:53:51

nv set interface <interface-id> neighbor ipv6 <address> lladdr <lladdr-id> flag

Configures a flag to indicate that the neighbor in the IP neighbor table is a router (is-router) or learned externally (ext_learn).

Command Syntax

Version History

Introduced in Cumulus Linux 5.7.0

Example

cumulus@switch:~$ nv set interface swp51 neighbor ipv6 fe80::4ab0:2dff:fea2:4c79 lladdr 00:00:5E:00:53:51 flag is-router

nv set interface <interface-id> neighbor ipv6 <address> lladdr <lladdr-id> state

Configures the state of the neighbor in the IP neighbor table (delay, failed, incomplete, noarp, permanent, probe, reachable, or stale).

Command Syntax

Version History

Introduced in Cumulus Linux 5.7.0

Example

cumulus@switch:~$ nv set interface swp51 neighbor ipv6 fe80::4ab0:2dff:fea2:4c79 lladdr 00:00:5E:00:53:51 state permanent

nv set interface <interface-id> ip neighbor-discovery

Configures ND for an interface. ND allows different devices on the same link to advertise their existence to their neighbors and to learn about the existence of their neighbors. ND is the IPv6 equivalent of IPv4 ARP for layer 2 address resolution.

nv set interface <interface-id> ip neighbor-discovery dnssl <domain-name-id>

Configures the DNS search lists (DNSSL).

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery dnssl accounting.nvidia.com

nv set interface <interface-id> ip neighbor-discovery dnssl <domain-name-id> lifetime

Configures the maximum amount of time you want to use the domain suffix for domain name resolution. You can set a value between 0 and 4294967295 seconds or use the keyword infinte to set the time to never expire. If you set the value to 0, the host does not use the DNSSL.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery dnssl accounting.nvidia.com lifetime infinite

nv set interface <interface-id> ip neighbor-discovery enable

Turns ND on or off. The default setting is on.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery enable off

nv set interface <interface-id> ip neighbor-discovery home-agent

Configures the switch to be a Home Agent.

nv set interface <interface-id> ip neighbor-discovery home-agent enable

Turns the Home Agent on or off. The default setting is off.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery home-agent enable on

nv set interface <interface-id> ip neighbor-discovery home-agent lifetime

Configures the maximum amount of time you want the router to act as a Home Agent. You can set a value between 0 and 65520 seconds. If you set the value to 0, the router is not a Home Agent. The default setting is 0.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery home-agent lifetime 200

nv set interface <interface-id> ip neighbor-discovery home-agent preference

Configures the Home Agent router preference used to order the addresses returned in the Home Agent address discovery reply. You can set a value between 0 and 65535. 0 is the lowest preference. The default setting is 0.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery home-agent preference 0

nv set interface <interface-id> ip neighbor-discovery mtu

Configures the MTU for ND messages on an interface. You can set a value between 1 and 65535.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery mtu 1500

nv set interface <interface-id> ip neighbor-discovery prefix

Configures the IPv6 prefix you want to include in router advertisements.

nv set interface <interface-id> ip neighbor-discovery prefix <ipv6-prefix-id> autoconfig

Configures automatic configuration to indicate to hosts on the local link that they can use the specified prefix for IPv6 auto configuration. The default setting is off.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery prefix 2001:db8:1::100/32 autoconfig on

nv set interface <interface-id> ip neighbor-discovery prefix <ipv6-prefix-id> off-link

Configures advertisement to make no statement about prefix on-link or off-link properties. The default setting is off.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery prefix 2001:db8:1::100/32 off-link on

nv set interface <interface-id> ip neighbor-discovery prefix <ipv6-prefix-id> preferred-lifetime

Configures the amount of time that addresses generated from a prefix remain preferred. You can specify a value between 0 and 4294967295. The default setting is 604800.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery prefix 2001:db8:1::100/32 preferred-lifetime 1000000

nv set interface <interface-id> ip neighbor-discovery prefix <ipv6-prefix-id> router-address

Configures advertisement to indicate to hosts on the local link that the specified prefix contains a complete IP address by setting R flag.

The default setting is off.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery prefix 2001:db8:1::100/32 router-address on

nv set interface <interface-id> ip neighbor-discovery prefix <ipv6-prefix-id> valid-lifetime

Configures the amount of time that the prefix is valid for on-link determination. You can specify a value between 0 and 4294967295. The default setting is 2592000.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery prefix 2001:db8:1::100/32 valid-lifetime 2000000000

nv set interface <interface-id> ip neighbor-discovery rdnss <ipv6-address-id>

Configures recursive DNS servers (RDNSS). You must specify the IPv6 address of each RDNSS you want to advertise.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery rdnss 2001:db8:1::100

nv set interface <interface-id> ip neighbor-discovery rdnss <ipv6-address-id> lifetime

Configures the maximum amount of time you want to use the RDNSS for domain name resolution. You can specify a value between 0 and 4294967295, or specify infinite to use the RDNSS for domain name resolution indefinitely. If you set the value to 0, the RDNSS address no longer advertises.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery rdnss 2001:db8:1::100 lifetime infinite

nv set interface <interface-id> ip neighbor-discovery router-advertisement

Configures router advertisement for an interface.

nv set interface <interface-id> ip neighbor-discovery router-advertisement enable

Enables router advertisement (on) or disables router advertisement (off) for the interface. The default setting is off.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery router-advertisement enable on

nv set interface <interface-id> ip neighbor-discovery router-advertisement fast-retransmit

Configures the specified interface to allow consecutive router advertisement packets to transmit more frequently than every three seconds (fast retransmit). The default setting is on.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery router-advertisement fast-retransmit off

nv set interface <interface-id> ip neighbor-discovery router-advertisement hop-limit

Configures the hop limit value in the IP header of the outgoing router advertisement packet. You can set a value between 0 and 255. The default setting is 64.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery router-advertisement hop-limit 100

nv set interface <interface-id> ip neighbor-discovery router-advertisement interval

Configures the maximum time in milliseconds allowed between sending unsolicited multicast RA from the interface. You can set a value between 70 and 1800000 milliseconds. The default setting is 600000.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery router-advertisement interval 60000

nv set interface <interface-id> ip neighbor-discovery router-advertisement interval-option

Configures the specified interface to indicate to hosts that the router uses an advertisement interval to send router advertisements. The default setting is off.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery router-advertisement interval-option on

nv set interface <interface-id> ip neighbor-discovery router-advertisement lifetime

Configures the maximum amount of time that router advertisement messages can exist on the route. You can specify a value between 0 and 9000. The default setting is 1800.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery router-advertisement lifetime 4000

nv set interface <interface-id> ip neighbor-discovery router-advertisement managed-config

Configures the specified interface to allow a dynamic host to use a managed protocol, such as DHCPv6, to configure IP addresses automatically (managed configuration). The default setting is off.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery router-advertisement managed-config on

nv set interface <interface-id> ip neighbor-discovery router-advertisement other-config

Configures the specified interface to allow a dynamic host to use a managed protocol to configure additional information through DHCPv6. The default setting is off.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery router-advertisement other-config on

nv set interface <interface-id> ip neighbor-discovery router-advertisement reachable-time

Configures the amount of time that an IPv6 node is reachable. You can set a value between 0 and 3600000 milliseconds. The default setting is 0.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery router-advertisement reachable-time 3600000

nv set interface <interface-id> ip neighbor-discovery router-advertisement retransmit-time

Configures the interval at which neighbor solicitation messages retransmit. You can set a value between 0 and 4294967295 milliseconds. The default setting is 0.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery router-advertisement retransmit-time 4294967295

nv set interface <interface-id> ip neighbor-discovery router-advertisement router-preference

Configures the specified interface to allow hosts to use router preference to select the default router. You can set a value of high, medium, or low. The default setting is medium.

Command Syntax

Version History

Introduced in Cumulus Linux 5.1.0

Example

cumulus@switch:~$ nv set interface swp1 ip neighbor-discovery router-advertisement router-preference high

nv set system global nd base-reachable-time

Configures how long a neighbor cache entry is valid. The entry is valid for at least the value between the base reachable time divided by two and three times the base reachable time divided by two. You can specify a value between 30 and 2147483 seconds. The default value is auto; NVUE derives the value for auto from the /etc/sysctl.d/neigh.conf file.

Version History

Introduced in Cumulus Linux 5.6.0

Example

cumulus@switch:~$ nv set system global nd base-reachable-time 50