Contents

MAC learning through a Layer 3 device commands· 1

display snmp-server arp-sync table· 1

reset snmp-server arp-sync table· 1

snmp-server arp-sync { interval | timeout } * 2

snmp-server arp-sync enable· 2

snmp-server arp-sync target-host 3

 

MAC learning through a Layer 3 device commands

display snmp-server arp-sync table

Use display snmp-server arp-sync table to display ARP entries synchronized through SNMP.

Syntax

display snmp-server arp-sync table

Views

Any view

Predefined user roles

network-admin

network-operator

context-admin

context-operator

Examples

# Display ARP entries synchronized through SNMP.

<Sysname> display snmp-server arp-sync table

IP Address       MAC Address        Aging(M)

1.1.1.1          00e0-0000-0001     1

Total:1

Table 1 Command output

Field	Description
Aging(M)	Aging time in minutes.

‌

Related commands

reset snmp-server arp-sync table

reset snmp-server arp-sync table

Use reset snmp-server arp-sync table to clear ARP entries synchronized through SNMP.

Syntax

reset snmp-server arp-sync table

Views

User view

Predefined user roles

network-admin

context-admin

Examples

# Clear ARP entries synchronized through SNMP.

<Sysname> reset snmp-server arp-sync table

Related commands

display snmp-server arp-sync table

snmp-server arp-sync { interval | timeout } *

Use snmp-server arp-sync { interval | timeout } * to set parameters for synchronizing APR entries through SNMP.

Use undo snmp-server arp-sync { interval | timeout } to restore the default.

Syntax

snmp-server arp-sync { interval interval | timeout time } *

undo snmp-server arp-sync { interval | timeout }

Default

The interval for sending SNMP requests is 5 seconds and the timeout for SNMP responses is 3 seconds.

Views

System view

Predefined user roles

network-admin

context-admin

Parameters

interval interval: Specifies the interval for sending SNMP requests in the range of 5 to 30 seconds.

timeout time: Specifies the timeout for SNMP responses in the range of 1 to 5 seconds.

Usage guidelines

With this feature configured, the device sends SNMP requests for ARP entry synchronization to the target Layer 3 device at the specified intervals. If the device does not receive an SNMP response before the timeout expires within the specified interval, the device re-sends SNMP requests.

Examples

# Set the interval for sending SNMP requests and the timeout for SNMP responses to 10 and 2 seconds, respectively.

<Sysname> system-view

[Sysname] snmp-server arp-sync interval 10 timeout 2

snmp-server arp-sync enable

Use snmp-server arp-sync enable to enable ARP entry synchronization through SNMP.

Use undo snmp-server arp-sync enable to disable ARP entry synchronization through SNMP.

Syntax

snmp-server arp-sync enable

undo snmp-server arp-sync enable

Default

ARP entry synchronization through SNMP is disabled.

Views

System view

Predefined user roles

network-admin

context-admin

Usage guidelines

With this feature enabled, the device acts as an NMS to learn all ARP entries on a Layer 3 device (agent) to obtain the MAC address of the Layer 3 device.

Examples

# Enable ARP entry synchronization through SNMP.

<Sysname> system-view

[Sysname] snmp-server arp-sync enable

snmp-server arp-sync target-host

Use snmp-server arp-sync target-host to configure the target Layer 3 device for ARP synchronization through SNMP.

Use undo snmp-server arp-sync target-host to remove the configuration of the target Layer 3 device for ARP synchronization through SNMP.

Syntax

SNMPv2c:

snmp-server arp-sync target-host address ip-address community { simple | cipher } community-name v2c

undo snmp-server arp-sync target-host address ip-address community { simple | cipher } community-name

SNMPv3:

snmp-server arp-sync target-host address ip-address usm-user v3 user-name [ { simple | cipher } authentication-mode { md5 | sha } auth-password [ privacy-mode { aes128 | des56 } pri-password ] ]

undo snmp-server arp-sync target-host address ip-address usm-user v3 user-name

Default

No target Layer 3 device is configured for ARP synchronization through SNMP.

Views

System view

Predefined user roles

network-admin

contex-admin

Parameters

address ip-address: Specifies an IPv4 address of the target Layer 3 device.

simple: Specifies a community name in plaintext form. For security purposes, the community name specified in plaintext form will be stored in encrypted form.

cipher: Specifies a community name in encrypted form.

community-name: Specifies the community name. The plaintext form is a case-sensitive string of 1 to 32 characters. The encrypted form is a case-sensitive string of 33 to 73 characters. Input a string as escape characters after a backslash (\).

v2c: Specifies SNMPv2c.

user-name: Specifies a username, a case-sensitive string of 1 to 32 characters.

v3: Specifies SNMPv3.

simple: Specifies an authentication key and an encryption key in plaintext from. The keys will be converted to a digest in encrypted form and stored in the device.

cipher: Specifies an authentication key and an encryption key in encrypted form. The keys will be converted to a digest in encrypted form and stored in the device.

authentication-mode: Specifies an authentication algorithm. If you do not specify the keyword, the system does not perform authentication.

·     md5: Specifies the HMAC-MD5 authentication algorithm. For information about the HMAC-MD5 algorithm, see IPsec configuration in VPN Instance Configuration Guide.

·     sha: Specifies the HMAC-SHA1 authentication algorithm. For information about the HMAC-SHA1 algorithm, see IPsec configuration in VPN Instance Configuration Guide.

auth-password: Specifies a case-sensitive authentication key in plaintext form or encrypted form. The value is a string of 8 to 64 characters.

privacy-mode: Specifies an encryption algorithm. If you do not specify this keyword, the system does not perform encryption.

·     aes128: Specifies the Advanced Encryption Standard (AES) algorithm that uses a 128-bit key.

·     des56: Specifies the Data Encryption Standard (DES) algorithm that uses a 56-bit key.

priv-password: Specifies a case-sensitive encryption key in plaintext form or encrypted form. The value is a string of 8 to 64 characters.

Usage guidelines

You can configure this command multiple times to specify multiple Layer 3 devices for ARP entry synchronization.

Examples

# Configure the device to use the plaintext-form community name testCommunity to synchronize ARP entries from Layer 3 device 10.1.1.1 through SNMPv2c.

<Sysname> system-view

[Sysname] snmp-server arp-sync target-host address 10.1.1.1 community simple testCommunity v2c

# Configure the device to synchronize ARP entries from Layer 3 device 10.1.1.1 through SNMPv3 by using usename testUser, authentication algorithm HMAC-SHA1, plaintext-form authentication key 123456TESTauth&!, encryption algorithm DES56, and plaintext-form encryption key 123456TESTencr&!.

<Sysname> system-view

[Sysname] snmp-server arp-sync target-host address 10.1.1.1 usm-user v3 testUser simple authentication-mode sha 123456TESTauth&! privacy-mode des56 123456TESTencr&!