ARP/ND

ARP

ARP View

Table 1 ARP View

Command	Purpose
show arp	Display ARP table entries.
clear neighbor all	Clear all ARP table entries.
clear neighbor interface {ethernet|link-aggregation|vlan} {interface_name[.subinterface-number]}	Delete the specified ARP table entries.

show arp

[Command]

show arp

[Purpose]

Display ARP table entries.

[View]

Privileged User View

[Use Cases]

sonic# show arp
Address       MacAddress         Iface        Vlan
------------  -----------------  -----------  ------
10.10.200.2   18:17:25:37:67:3e  -            200
Total number of entries 1

clear neighbor all

[Command]

clear neighbor all

[Purpose]

Clear all ARP table entries.

[View]

Privileged User View

[Use Cases]

sonic# clear neighbor all

clear neighbor interface {ethernet|link-aggregation|vlan} {interface_name[.subinterface-number]}

[Command]

clear neighbor interface {ethernet|link-aggregation|vlan} {interface_name[.subinterface-number]}

[Purpose]

Delete the specified ARP table entries.

[Parameters]

Parameter	Description
interface_name	Interface name (eg.0/1)
subinterface-number	Subinterface number.

[View]

Privileged User View

[Use Cases]

sonic# clear neighbor interface ethernet 0/2

ARP Config

Table 2 ARP Config

Command	Purpose
arp static A.B.C.D HH:HH:HH:HH:HH:HH interface {ethernet|link-aggregation|vlan} interface_name[.subinterface-number]	Configure static ARP table entries.
arp timeout aging-time	Configure ARP aging time.
arp probe interval time	Configure ARP probe interval.
arp probe times probe-times	Configure ARP probe times.

arp static

[Command]

arp static A.B.C.D HH:HH:HH:HH:HH:HH interface {ethernet|link-aggregation|vlan} interface_name[.subinterface-number]

[Purpose]

Configure static ARP table entries.

[Parameters]

Parameter	Description
A.B.C.D	IPv4 address
HH:HH:HH:HH:HH:HH	MAC address.
interface_name	Interface name (eg.0/1)
subinterface-number	Subinterface number.

[View]

Global Configuration View

[Notes]

Run command no arp static A.B.C.D HH:HH:HH:HH:HH:HH interface {ethernet|link-aggregation|vlan} interface_name[.subinterface-number] to delete static ARP entries.

[Use Cases]

sonic# configure terminal
sonic(config)# arp static 3.3.3.3 00:00:00:00:00:01 interface vlan 5
sonic(config)# arp static 4.4.4.4 00:00:00:00:00:02 interface ethernet 0/1
sonic(config)# arp static 5.5.5.5 00:00:00:00:00:03 interface link-aggregation 1

arp timeout

[Command]

arp timeout aging-time

[Purpose]

Configure ARP aging time.

[Parameters]

Parameter	Description
aging-time	Specify the aging time in seconds. The default ARP aging time is 300s, and the range is from 60 to 86400.

[View]

Global Configuration View / Physical Interface / Sub-interface / VLANIF / LAGIF Configuration View

[Notes]

Run command no arp timeout to delete ARP aging time configuration and restore to default.

[Use Cases]

sonic# configure terminal
sonic(config)# arp timeout 500
sonic(config)# interface vlan 100
sonic(config-vlanif-100)# arp timeout 8500

arp probe interval time

[Command]

arp probe interval time

[Purpose]

Configure ARP probe interval.

[Parameters]

Parameter	Description
time	Specify the interval in seconds, the default value is 6 seconds, and the range is 1~65535.

[View]

Global Configuration View / Physical Interface / Sub-interface / VLANIF / LAGIF Configuration View

[Notes]

Run command no arp probe interva l to delete the ARP probe interval configuration and restore the default value.

[Use Cases]

sonic# configure terminal
sonic(config)# arp probe interval 10
sonic(config)# interface ethernet 0/80
sonic(config-if-0/80)# arp probe interval 5
sonic(config-if-0/80)# no arp probe interval

arp probe times probe-times

[Command]

arp probe times probe-times

[Purpose]

Configure ARP probe times.

[Parameters]

Parameter	Description
probe-times	Specify ARP probe times, the default value is 5 times, and the range is 1~65535.

[View]

Physical Interface / Sub-interface / VLANIF / LAGIF Configuration View

[Notes]

Run command no arp probe times to delete the ARP probe times configuration and restore the default value.

[Use Cases]

sonic# configure terminal
sonic(config)# arp probe times 10
sonic(config)# interface ethernet 0/80
sonic(config-if-0/80)# arp probe times 14
sonic(config-if-0/80)# no arp probe times

NDP

NDP View

Table 3 NDP View

Command	Purpose
show ndp	Display NDP table.

show ndp

[Command]

show ndp

[Purpose]

Display NDP table.

[View]

Privileged User View

[Use Cases]

sonic# show ndp
Address    MacAddress         Iface       Vlan    Status
---------  -----------------  ----------  ------  ---------
2023::2    00:00:01:00:00:01  0/24        -       PERMANENT
Total number of entries 1

NDP Config

Table 4 NDP Config

Command	Purpose
ndp static *A::B HH:HH:HH:HH:HH:HH *interface{ethernet|link-aggregation|vlan} interface_name	Configure static NDP table entries.

ndp static A::B HH:HH:HH:HH:HH:HH interface {ethernet|link-aggregation|vlan} interface_name[.subinterface-number]

[Command]

ndp static A::B HH:HH:HH:HH:HH:HH interface {ethernet|link-aggregation|vlan} interface_name[.subinterface-number]

[Purpose]

Configure static NDP table entries.

[Parameters]

Parameter	Description
A::B	IPv6 address.
HH:HH:HH:HH:HH:HH	MAC address.
interface_name	Interface name (eg.0/1).
subinterface-number	Subinterface number.

[View]

Global Configuration View

[Notes]

Run command no arp static A::B HH:HH:HH:HH:HH:HH interface {ethernet|link-aggregation|vlan} interface_name[.subinterface-number] to delete static NDP.

[Use Cases]

sonic# configure terminal
sonic(config)# ndp static 2023::2 00:00:01:00:00:01 interface ethernet 0/24

ARP/ND to host

There are two levels of policy for ARP/ND to host:

• Level 1: Interface-based Interface-based policies are divided into default policy and user-defined policy. The system gives priority to matching user-defined policy. If not matched, the default policy will be used. Optional actions include permit, deny, and pass. While permit and deny mean to perform ARP/ND to host route conversion and non-conversion behavior directly without matching the next level of segment policy, pass means to skip the interface policy process and enter the next level of policy.
• Level 2: Segment-based Segment policy is also divided into default policy and user-defined segment policy. The system matches user-defined policy first, if not matched, then the default policy will be used. Optional actions include permit and deny, which correspond to ARP/ND to host route conversion and non-conversion behavior.

ARP/ND to host View

Table 5 ARP/ND to Host View

Command	Purpose
show arp-to-host summary	Display ARP/ND to Host summary info.
show arp-to-host policy	Display ARP/ND to Host policy configuration.

show arp-to-host summary

[Command]

show arp-to-host summary

[Purpose]

Display ARP/ND to host summary info.

[View]

Privileged User View

[Use Cases]

sonic# show arp-to-host summary
Vrf name    Convert    Fast convergence      Metric
----------  ---------  ------------------  --------
default     enable     disable                 5200

show arp-to-host policy

[Command]

show arp-to-host policy

[Purpose]

Display ARP/ND to host policy configuration.

[View]

Privileged User View

[Use Cases]

sonic# show arp-to-host policy
Port:
Port        Policy
----------  --------
0/56        permit
Network:
Vrf name    Network     Policy
----------  ----------  --------
default     1.1.1.1/24  permit

ARP/ND to host Config

Table 6 ARP to Host Config

Command	Purpose
arp-to-host	Enter ARP/ND to host Configuration View.
convert enablevrf vrf_name	Enable ARP/ND-to-host for specified VRFs.
policy default_policy port vrf vrf_name {permit|deny|pass}	Configure ARP/ND-to-host default interface policy.
policy port{ethernet|link-aggregation} interface_name {permit|deny|pass}	Configure an ARP/ND-to-host user-defined interface policy.
policy default_policy network vrf vrf_name {permit|deny}	Configure ARP/ND-to-host default segment policy.
policy network {A.B.C.D/M|X:X::X:X/M} vrf vrf_name {permit|deny}	Configure ARP/ND-to-host user-defined segment policy.

arp-to-host

[Command]

arp-to-host

[Purpose]

Enter ARP/ND-to-host Configuration View

[View]

Global Configuration View

[Use Cases]

sonic# configure terminal
sonic(config)# arp-to-host
sonic(config-arp-to-host)# convert enable vrf default

convert enable vrf vrf_name

[Command]

convert enable vrf vrf_name

[Purpose]

Enable ARP/ND-to-host for specified VRFs.

[Parameters]

Parameter	Description
vrf_name	Specify the VRF name, the default VRF is default.

[View]

ARP/ND-to-host Configuration View

[Notes]

Run command no convert enable vrf vrf_name to disable ARP/ND-to-host for specified VRFs.

[Use Cases]

sonic# configure terminal
sonic(config)# arp-to-host
sonic(config-arp-to-host)# convert enable vrf default
sonic(config-arp-to-host)# convert enable vrf 123

policy default_policy port vrf vrf_name {permit|deny|pass}

[Command]

policy default_policy port vrf vrf_name {permit|deny|pass}

[Purpose]

Configure ARP/ND-to-host default interface policy.

[Parameters]

Parameter	Description
vrf_name	Specify the VRF name, the default VRF is default.

[View]

ARP/ND-to-host Configuration View

[Notes]

Run command no policy default_policy port vrf vrf_name to delete ARP/ND-to-host default interface policy.

[Use Cases]

sonic# configure terminal
sonic(config)# arp-to-host
sonic(config-arp-to-host)# policy default_policy port vrf default permit

policy port {ethernet|link-aggregation} interface_name {permit|deny|pass}

[Command]

policy port {ethernet|link-aggregation} interface_name {permit|deny|pass}

[Purpose]

Configure an ARP/ND-to-host user-defined interface policy.

[Parameters]

Parameter	Description
interface_name	Interface name (eg.0/1)

[View]

ARP/ND-to-host Configuration View

[Notes]

Run command no policy port {ethernet|link-aggregation} interface_name to delete ARP/ND-to-host user-defined interface policy.

[Use Cases]

sonic# configure terminal
sonic(config)# arp-to-host
sonic(config-arp-to-host)# policy port ethernet 0/4 permit
sonic(config-arp-to-host)# policy port link-aggregation 4 deny

policy default_policy network vrf vrf_name {permit|deny}

[Command]

policy default_policy network vrf vrf_name {permit|deny}

[Purpose]

Configure ARP/ND-to-host default segment policy.

[Parameters]

Parameter	Description
vrf_name	Specify the VRF name, the default VRF is default.

[View]

ARP/ND-to-host Configuration View

[Notes]

Run command no policy default_policy network vrf vrf_name to delete ARP/ND-to-host default segment policy.

[Use Cases]

sonic# configure terminal
sonic(config)# arp-to-host
sonic(config-arp-to-host)# policy default_policy network vrf default deny

policy network {A.B.C.D/M|X:X::X:X/M} vrf vrf_name {permit|deny}

[Command]

policy network {A.B.C.D/M|X:X::X:X/M} vrf vrf_name {permit|deny}

[Purpose]

Configure ARP/ND-to-host user-defined segment policy.

[Parameters]

Parameter	Description
A.B.C.D/M	IPv4 address with prefix length.
X:X::X:X/M	IPv6 address with prefix length.
vrf_name	Specify the VRF name, the default VRF is default.

[View]

ARP/ND-to-host Configuration View

[Notes]

Run command no policy default_policy network vrf vrf_name to delete ARP/ND-to-host user-defined segment policy.

[Use Cases]

sonic# configure terminal
sonic(config)# arp-to-host
sonic(config-arp-to-host)# policy network 10.179.238.64/26 vrf 123 deny

ARP Proxy

Table 7 ARP Proxy

Command	Purpose
arp proxy [mode {default|evpn}]	Enable ARP proxy.
arp proxy extend request	Enable active detection for silent terminals.
arp proxy extend reply	Enable learning of ARP Reply messages.

arp proxy [mode {default|evpn}]

[Command]

arp proxy [mode {default|evpn}]

[Purpose]

Enable ARP proxy.

[View]

Physical Interface / Sub-interface / VLANIF / LAGIF Configuration View

[Notes]

The mode can be default or evpn, and the default mode is default. Run command no arp proxy to disable ARP proxy.

[Use Cases]

sonic# configure terminal
sonic(config)# interface vlan 100
sonic(config-vlanif-100)# arp proxy
sonic(config-vlanif-100)# arp proxy mode evpn

arp proxy extend request

[Command]

arp proxy extend request

[Purpose]

Enable active detection for silent terminals.

[View]

Physical Interface / Sub-interface / VLANIF / LAGIF Configuration View

[Notes]

This feature is enabled when there are silent terminals (terminals which do not send ARP messages actively) in the Layer 2 network. Once enabled, when the switch receives an ARP request, it will send ARP request to probe if the target ip belongs to the same network segment. Run command no arp proxy extend request to disable this feature.

[Use Cases]

sonic# configure terminal
sonic(config)# interface 0/60
sonic(config)# interface ethernet 0/60
sonic(config-if-0/60)# arp proxy extend request
sonic(config-if-0/60)# no arp proxy extend request

arp proxy extend reply

[Command]

arp proxy extend reply

[Purpose]

Enable learning of ARP Reply messages.

[View]

Physical Interface / Sub-interface / VLANIF / LAGIF Configuration View

[Notes]

Run command no arp proxy extend reply to disable this feature.

[Use Cases]

sonic# configure terminal
sonic(config)# interface ethernet 0/60
sonic(config-if-0/60)# arp proxy extend reply
sonic(config-if-0/60)# no arp proxy extend reply

ND Proxy

Table 8 ND Proxy

Command	Purpose
nd proxy mode default	Enable ND proxy.

nd proxy mode default

[Command]

nd proxy mode default

[Purpose]

Enable ND proxy.

[View]

Physical Interface / VLANIF / LAGIF Configuration View

[Notes]

Run command no nd proxy to disable ND proxy.

[Use Cases]

sonic# configure terminal
sonic(config)# interface vlan 100
sonic(config-vlanif-100)# nd proxy mode default

SLAAC

SLAAC View

Table 9 SLAAC View

Command	Purpose
show radv	Display RA configuration.

show radv

[Command]

show radv

[Purpose]

Display RA configuration

[View]

Privileged User View

[Use Cases]

sonic# show radv
Enabled: true
Global unicast only: false
+-------------+---------------+----------------+--------------------+-----------+-----------------+------------+---------+-------------------------+
| Interface   | Prefix        | Managed_Flag   | Otherconfig_Flag   | OffLink   | No-autonomous   | Link_MTU   | RDNSS   | Route | Preference      |
+=============+===============+================+====================+===========+=================+============+=========+=========================+
| vlan11      |               | on             |                    |           |                 |            |         |                         |
+-------------+---------------+----------------+--------------------+-----------+-----------------+------------+---------+-------------------------+
| 0/52        | 2000:101::/64 | on             | on                 | on        | on              | 1900       | 2000::1 | 2000:101::10/128 | high |
+-------------+---------------+----------------+--------------------+-----------+-----------------+------------+---------+-------------------------+

SLAAC Config

Table 10 SLAAC Config

Command	Purpose
radv enable	Enable RA notification.
radv dns-server X:X::X:X	Configure DNS information for RA notification.
radv link-mtu mtu	Configure the MTU of the link for RA notification.
radv prefix X:X::X:X/M	Configure prefix information for RA notification.
radv route-information X:X::X:X/M [preference{low|high|medium}]	Configure route information for RA notification.
radv managed-flag	Set the managed-flag to on.
radv other-config-flag	Set the other-config-flag to on.
radv offlink	Set the flag of on-link to off.
radv no-autonomous	Set the flag of autonomous to off.
radv ra-interval MaxRtrAdvInterval MinRtrAdvInterval	Configure the maximum and minimum time interval between two RA notifications

radv enable

[Command]

radv enable

[Purpose]

Enable RA notification.

[View]

Global Configuration View

[Notes]

Run command radv commit to take effect. Run command no radv enable to disable RA notification.

[Use Cases]

sonic# configure
sonic(config)# radv enable
Please enter 'radv commit' to take effect
sonic(config)# radv commit

radv dns-server X:X::X:X

[Command]

radv dns-server X:X::X:X

[Purpose]

Configure DNS information for RA notification.

[Parameters]

Parameter	Description
X:X::X:X	IPv6 address of DNS server.

[View]

Physical Interface / Sub-interface/ VLANIF / LAGIF Configuration View

[Notes]

Run command radv commit to take effect. Run command no radv dns-server X:X::X:X to remove the configuration.

[Use Cases]

sonic# configure
sonic(config)# interface ethernet 0/52
sonic(config-if-0/52)# radv dns-server 2002::2
Please enter 'radv commit' to take effect
sonic(config-if-0/52)# radv commit

radv link-mtu mtu

[Command]

radv link-mtu mtu

[Purpose]

Configure the MTU of the link for RA notification

[Parameters]

Parameter	Description
mtu	Set link-mtu, the default value is 9216.

[View]

Physical Interface / Sub-interface/ VLANIF / LAGIF Configuration View

[Notes]

Run command radv commit to take effect. Run command no radv link-mtu to remove the configuration.

[Use Cases]

sonic# configure
sonic(config)# interface ethernet 0/52
sonic(config-if-0/52)# radv link-mtu 1500
Please enter 'radv commit' to take effect
sonic (config-if-0/52)# radv commit
sonic(config-if-0/52)#

radv prefix X:X::X:X/M

[Command]

radv prefix X:X::X:X/M

[Purpose]

Configure prefix information for RA notification.

[Parameters]

Parameter	Description
X:X::X:X/M	Network prefix for RA notifications

[View]

Physical Interface / Sub-interface/ VLANIF / LAGIF Configuration View

[Notes]

When RA notification is enabled, you are required to set the prefix information, or the interface will not send RA messages. Run command radv commit to take effect. Run command no radv prefix X:X::X:X/M to remove the configuration.

[Use Cases]

sonic# configure
sonic(config)# interface ethernet 0/52
sonic(config-if-0/52)# radv prefix 3001::/64
Please enter 'radv commit' to take effect
sonic(config-if-0/52)# radv commit

radv route-information X:X::X:X/M[preference{low|high|medium}]

[Command]

radv route-information X:X::X:X/M[preference{low|high|medium}]

[Purpose]

Configure route information for RA notification

[Parameters]

Parameter	Description
X:X::X:X/M	The network segment of RA’s routing announcement

[View]

Physical Interface / Sub-interface / VLANIF / LAGIF Configuration View

[Notes]

Run command radv commit to take effect Run command no radv route-information X:X::X:X/M to remove the configuration.

[Use Cases]

sonic# configure
sonic(config)# interface ethernet 0/52
sonic(config-if-0/52)# radv route-information 3001:1::/64 preference low
Please enter 'radv commit' to take effect
sonic(config-if-0/52)# radv commit

radv managed-flag

[Command]

radv managed-flag

[Purpose]

Set the managed-flag to on(default is off)

[View]

Physical Interface / Sub-interface / VLANIF / LAGIF Configuration View

[Notes]

Run command radv commit to take effect. Run command no radv managed-flag to revert it to off.

[Use Cases]

sonic# configure
sonic(config)# interface ethernet 0/52
sonic(config-if-0/52)# radv managed-flag
Please enter 'radv commit' to take effect
sonic(config-if-0/52)# radv commit

radv other-config-flag

[Command]

radv other-config-flag

[Purpose]

Set the other-config-flag to on (default is off).

[View]

Physical Interface / Sub-interface / VLANIF / LAGIF Configuration View

[Notes]

Run command radv commit to take effect. Run command no radv other-config-flag to revert it to off.

[Use Cases]

sonic# configure
sonic(config)# interface ethernet 0/52
sonic(config-if-0/52)# radv other-config-flag
Please enter 'radv commit' to take effect
sonic(config-if-0/52)# radv commit

radv offlink

[Command]

radv offlink

[Purpose]

Set the flag of on-link to off (default is on).

[View]

Physical Interface / Sub-interface / VLANIF / LAGIF Configuration View

[Notes]

Run command radv commit to take effect. Run command no radv offlink to revert it to on.

[Use Cases]

sonic(config)# interface ethernet 0/52
sonic(config-if-0/52)# radv offlink
Please enter 'radv commit' to take effect
sonic(config-if-0/52)# radv commit

radv no-autonomous

[Command]

radv no-autonomous

[Purpose]

Set the flag of autonomous to off (default is on).

[View]

Physical Interface / Sub-interface / VLANIF / LAGIF Configuration View

[Notes]

Run command radv commit to take effect. Run command no radv no-autonomous to revert it to on.

[Use Cases]

sonic(config)# interface ethernet 0/52
sonic(config-if-0/52)# radv no-autonomous
Please enter 'radv commit' to take effect
sonic(config-if-0/52)# radv commit

radv ra-interval MaxRtrAdvInterval MinRtrAdvInterval

[Command]

radv ra-interval MaxRtrAdvInterval MinRtrAdvInterval

[Purpose]

Configure the maximum and minimum time interval between two RA notifications.

[Parameters]

Parameter	Description
MaxRtrAdvInterval	the maximum time interval for RA notifications, default value is 600, unit: seconds
MinRtrAdvInterval	the minimum time interval for RA notifications, default value is 600, unit: seconds

[View]

Physical Interface / Sub-interface / VLANIF / LAGIF Configuration View

[Notes]

Run command radv commit to take effect. Run command no radv ra-interval to set back to default value.

[Use Cases]

sonic# configure
sonic(config)# interface ethernet 0/40
sonic(config-if-0/40)# radv ra-interval 50 25
Please enter 'radv commit' to take effect
sonic(config-if-0/40)# radv commit