3-2You can solve the problem by enabling proxy ARP on Switch. After that, Switch can reply to the ARPrequest from Host A with the MAC address of VLAN-interface 1, and forward packets sent from Host Ato Host B. In this case, Switch seems to be a proxy of Host B.A main advantage of proxy ARP is that it is added on a single router without disturbing routing tables ofother routers in the network. Proxy ARP acts as the gateway for IP hosts that are not configured with adefault gateway or do not have routing capability.Local Proxy ARPAs shown in Figure 3-2, Host A and Host B belong to VLAN 2, but are isolated at Layer 2. Host Aconnects to GigabitEthernet 1/0/3 while Host B connects to GigabitEthernet 1/0/1. Enable local proxyARP on Switch to allow Layer 3 communication between the two hosts.Figure 3-2 Application environment of local proxy ARPSwitchVlan-int2192.168.10.100/24SwitchGE1/0/3GE1/0/1GE1/0/2Host A192.168.10.99/24Host B192.168.10.200/24VLAN 2port-isolate groupIn one of the following cases, you need to enable local proxy ARP:z Hosts connecting to different isolated Layer 2 ports in the same VLAN need to communicate atLayer 3.z If an isolate-user-vlan is configured, hosts in different secondary VLANs of the isolate-user-vlanneed to communicate at Layer 3.Enabling Proxy ARPFollow these steps to enable proxy ARP in VLAN interface view:To do… Use the command… RemarksEnter system view system-view —Enter interface view interface interface-type interface-number RequiredEnable proxy ARP proxy-arp enable RequiredDisabled by default.Follow these steps to enable local proxy ARP in VLAN interface view:To do… Use the command… RemarksEnter system view system-view —Enter interface view interface interface-type interface-number Required
