Netgear XCM8806 Chassis User Manual - Page 633
Command-line Support for IP Broadcast Handling, fast-direct-broadcast, ignore-broadcast
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NETGEAR 8800 User Manual final hop router, when IP subnet directed broadcast forwarding is enabled on an IP VLAN via the command line, the following happens: • Some basic validity checks are performed (for example, checking to see if the VLAN has IP enabled) • A subnet broadcast route entry for the subnet is installed. For example, consider a system with the following configuration: VLAN-A = 10.1.1.0/24, ports 1:1, 1:2, 1:3, 1:4 VLAN-B = 20.1.1.0/24, ports 1:5, 1:6, 1:7, 1:8 VLAN-C = 30.1.1.0/24, ports 1:9, 1:10, 1:11 If you enable IP directed broadcast forwarding on VLAN-A, you should install a route entry for 10.1.1.1.255 on this system. • A packet arriving on port 1:5 VLAN-B with destination IP (DIP) set to 10.1.1.255, the source IP (SIP) set to 20.1.1.3, the DMAC set to the router MAC, and the SMAC set to the originating system MAC, arrives at the installed route entry and is sent out on all the ports of VLAN-A, with DMAC set to be all FF and the SMAC set to the router's system MAC. • An IP packet arriving on port 1:1 VLAN-A with the DIP set to 10.1.1.255, the SIP set to 10.1.1.3, the DMAC set to all FF, and the SMAC set to the originator's MAC, causes the L2 to be flooded out of all the ports of VLAN-A. When IP subnet directed broadcast is disabled on an IP VLAN, on each port of the VLAN, all IP subnet directed broadcast entries are deleted. Note: IP subnet directed broadcast uses fast-path forwarding. Command-line Support for IP Broadcast Handling The enable ipforwarding and disable ipforwarding commands are enhanced to support the enhanced IP broadcast handling functionality on BlackDiamond 10808, 12800, and 20800 platforms. Specifically, the following two keywords were added to the commands: • fast-direct-broadcast, which specifies to forward IP broadcast packets in the hardware and send a copy to the CPU • ignore-broadcast, which specifies to forward IP broadcast packets in the hardware but not send a copy to the CPU For further details, see the appropriate command reference pages in the NETGEAR 8800 Chassis Switch CLI Manual. Note: These two keywords are available on BlackDiamond 10808 and 20800 series switches only. Chapter 20. IPv4 Unicast Routing | 633
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