★ Configuring a multiport ARP entry does not take effect

you can refer to this topo

We need to transmit Netflow UDP traffic in only one direction (!) from the ISP Router to several servers connected via H3C switches according to the diagram that I sent earlier.

According to our solution, the servers do not transmit anything to the network in vlan 919, and accordingly they do not transmit any traffic in response to the ISP Router.

1.Check the learning status of ARP and mac addresses, which is normal.

  ===============display arp all=============== 

  Type: S-Static   D-Dynamic   O-Openflow   R-Rule   M-Multiport  I-Invalid

IP address      MAC address    VLAN/VSI name Interface                Aging Type

10.216.189.34   5678-5678-5678 919           --                       --    M  

  ===============display mac-address=============== 

MAC Address      VLAN ID    State            Port/Nickname            Aging

5678-5678-5678   919        Multiport        BAGG1                    N

                                             BAGG2           

                                             BAGG3           

2. To make a manually added multi-port ARP entry take effect, you must create a Multiport service loopback group and add several idle ports of the device to the group. For details about how to create and configure a service loopback group, see Service Loopback Group in Layer 2 Technology - Ethernet Switching Configuration Guide.

Configuring a service loopback group

1.     Enter system view.

system-view

2.     Create a service loopback group and specify its service type.

service-loopback group group-id type { inter-vpn-fwd | { multicast-tunnel | tunnel } * | multiport | telemetry-stream }

You can configure only one service loopback group for a service type.

3.     Enter Layer 2 Ethernet interface view.

interface interface-type interface-number

4.     Assign the port to the service loopback group.

port service-loopback group group-id

By default, a port does not belong to a service loopback group

whole configuation:

#

interface Vlan-interface919

ip address 10.2xx.xxx.33 255.255.255.248

#

mac-address multiport 5678-5678-5678 interface Bridge-Aggregation1 to Bridge-Aggregation3 vlan 919

#

undo arp check enable

arp multiport 10.2xx.xxx.34 5678-5678-5678 919

#

service-loopback group 1 type multiport

interface twenty-fivegige 1/0/1

port service-loopback group 1

#