@Karthikeyan.M8, I would recommend you to check below points - 1. Check VLAN Tagging defined on the firewall sub-interface. VLAN Tag should match on the firewall and switch side. Also if on switch side, its plain trunk then thats ok but if you are having specific vlan flowed then check if desired vlan are flowed/passed through the trunk. 2. Make sure proper access VLAN is mapped to the server which you are trying to take into network. Also see if that vlan is flowed till the switch where your server is connected. L2 VLAN should be available on the switches where you need connectivity for that VLAN segment. 3. Are you trying to check reachability by giving static IP to the server? If it is on DHCP, check if proper IP, Mask and default gateway is getting configured on the server through DHCP. In case of static IP configuration also, verify these details. 4. How the IP is configured on the firewall L3 sub-interface? e.g. one of the VLAN is having segment 192.168.10.0/24, make sure IP on the sub-interface is configured with proper subnet mask. e.g. here, it should be /24 not /32 . With /32, firewall will not add route for complete network (for /24) under routing table. And again, check VLAN TAG. If you're good with all above points, then you should see arp for server IP under firewall arp table.
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