Netgear XCM8806 Chassis User Manual - Page 632
UDP Echo Server, IP Broadcast Handling
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NETGEAR 8800 User Manual configure vlan udp-profile [ | none] or use this command: unconfigure vlan udp-profile For more information about creating and editing policy files, see Chapter 12, Policy Manager. For more information about ACL policy files, see Chapter 13, ACLs. UDP Echo Server You can use UDP echo packets to measure the transit time for data between the transmitting and receiving ends. To enable UDP echo server support, use the following command: enable udp-echo-server {vr }{udp-port } To disable UDP echo server support, use the following command: disable udp-echo-server {vr } IP Broadcast Handling XCM8800 supports IP subnet directed broadcast forwarding. In XCM8800, IP subnet directed broadcast forwarding is done in the software by default; if you want to perform forwarding in the hardware, see the command reference pages on IP forwarding in the NETGEAR 8800 Chassis Switch CLI Manual. IP Broadcast Handling Details To understand how IP broadcast handling functions in XCM8800, consider the following two examples. For the first example, a system sends an IP packet (for example, via the ping command) to an IP subnet directed broadcast address which is directly connected to that system. In this case, the IP packet goes out as an L2 broadcast with the destination media access control (DMAC) addresses all set to FF, while the source media access control (SMAC) is set to the system MAC. This packet is sent out of all the ports of the VLAN. In the second example, a system sends a packet (for example, via the ping command) to an IP subnet directed broadcast address which is remotely connected via a gateway. In this case, the IP packet goes out as an L2 unicast packet with the DMAC equal to the gateway's MAC address, while the SMAC is set to the system MAC. At the gateway router, the existing IP packet forwarding mechanism is sufficient to send the packet out of the correct interface if the router is not the final hop router. When the packet reaches the final hop router, which is directly connected to the target IP subnet, IP directed broadcast forwarding needs to be turned on. The IP broadcast handling feature is applicable only at the final hop router directly attached to the target subnet. At the 632 | Chapter 20. IPv4 Unicast Routing
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