Configuring a multiport ARP entry
For a multiport ARP entry, the multicast MAC address entry specifies the VLAN ID and output ports, and the short static ARP entry specifies the VPN and the IP address. A multiport ARP entry is never overwritten by a dynamic, short static, or long static ARP entry.
The multiport ARP entry does not take effect if the corresponding VLAN interface is not created, is down, or does not match the specified VPN. Thus, packets matching it are discarded. It takes effect when the VLAN interface is up, and matches the specified VPN.
The short static ARP entry uses its MAC address to find a matching multicast MAC address entry. If the MAC address exists in multiple VLANs, the short static ARP entry uses the MAC address that has the smallest VLAN ID to generate the multiport ARP entry.
When multiport ARP entries reach the maximum number, the short static ARP entry and the matching multicast MAC address entry cannot generate a multiport ARP entry. In addition, they cannot automatically generate the multiport ARP entry when any existing multiport ARP entries are removed. You need to manually configure them again.
For more information about the multicast MAC address entry, see the mac-address multicast command in IP Multicast Command Reference.
To configure a multiport ARP entry:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Configure a multicast MAC address entry. | mac-address multicast mac-address interface interface-list vlan vlan-id | No static multicast MAC address entries exist by default. |
3. Configure a short static ARP entry | arp static ip-address mac-address [ vpn-instance vpn-instance-name ] | The mac-address in the short static ARP entry must be the same as that in the multicast MAC address entry. |