Netgear XCM8810 Chassis Hardware Installation Guide - Page 1169

NETGEAR 8800 Chassis Switch CLI Manual Usage Guidelines With this command, a user can configure certain multicast addresses to be slow path flooded within the VLAN, which otherwise are fast path forwarded according to IGMP and/or Layer 3 multicast protocol. A policy file is a text file with the extension, .pol. It can be created or edited with any text editor. The specified policy file should contain a list of addresses which determine if certain multicast streams are to be treated specially. Typically, if the switch receives a stream with a destination address which is in the in 'permit' mode, that stream is software flooded and no hardware entry is installed. When adding an IP address into the policy file, a 32-bit host address is recommended. This feature is meant to solve the multicast connectivity problem for unknown destination addresses within system reserved ranges. Specifically this feature was introduced to solve the problem of recognizing certain streams as control packets. To create a policy file for the snooping flood-list, use the following template: # This is a template for IGMP Snooping Flood-list Policy File # Add your group addresses between "Start" and "End" # Do not touch the rest of the file!!!! entry igmpFlood { if match any Start of group addresses nlri 234.1.1.1/32; nlri 239.1.1.1/32 end of group addresses then { permit; } } entry catch_all { if { } then { deny; } } Note: The switch does not validate any IP address in the policy file used in this command. Therefore, slow-path flooding should be used only for streams which are very infrequent, such as control packets. It should not be used for multicast data packets. This option overrides any default mechanism of hardware forwarding (with respect to IGMP, PIM, or DVMRP) so it should be used with caution. Chapter 26. IP Multicast Commands | 1169