Description of rrop related commands

Description of rrop related commands

(1) rrop anti-bmc network ipv4-simple enable

After enabling the basic broadcast and multicast packet control functions of the IPv4 network, when the uplink physical interface of the AP receives the downlink broadcast and multicast packets, the AP will locally respond to the ARP broadcast packets and respond to the DHCP broadcast request packets. (and dhcp packets of non-client terminals) are discarded, and other basic IPv4 broadcast and multicast packets are processed normally. In this way, it can effectively reduce the arp packets of the gateway or terminal in the network to the air interface, and can greatly reduce the broadcast traffic in the network;

(2) rrop anti-bmc default-action deny configures to deny the AP from sending broadcast and multicast packets in the network to the Radio interface

The combination of these two messages can eliminate most broadcast messages in the network, which is similar to our layer-2 isolation;

The R5446P06 version will enable the first command by default: rrop anti-bmc network ipv4-simple enable, that is, we will proxy the arp message by default, so there will be two situations in the AGV car scene:

1. There is no connection between the AGV’s downlink PC and the upper device: In the AGV car and client mode networking, the client ap acts as a proxy for the terminal connected under it, and the upstream device only sees the mac of the client ap, but it corresponds to multiple IPs. That is to include the PC connected behind the client ap. When the Antibmc function performs arp reply, it looks up the entry according to the destination IP. This entry only contains the IP of the client ap, so when the arp request message received by antibmc is a request for the terminal connected behind the client ap, Antibmc considers this If the PC is not online at the current ap, the arp request message will be discarded, resulting in network failure in some cases.

2. The PC connected to the AGV cannot obtain the address: when Antibmc processes the dhcp offer message, the mac in the dhcp header does not have a corresponding client, and the message will be discarded, resulting in the PC being unable to apply for an IP address.

Therefore, in the AGV scenario and the AP client networking scenario, after the device is upgraded to the R5444P06 version, you need to run the command: rrop anti-bmc network disable to disable the antibmc function of the AP.