Enhancements in Release F.02.02

The Switch Excludes Well-Known or Reserved Multicast Addresses from IP Multicast Filtering

The Switch Excludes Well-Known or Reserved Multicast Addresses from IP Multicast Filtering

Each multicast host group is identified by a single IP address in the range of 224.0.0.0 through 239.255.255.255. Specific groups of consecutive addresses in this range are termed "well-known" addresses and are reserved for predefined host groups. IGMP does not filter these addresses, so any packets the switch receives for such addresses are flooded out all ports assigned to the VLAN on which they were received (except the port on which the packets entered the VLAN). The following table lists the 32 well-known address groups (8192 total addresses) that IGMP does not filter on the Series 2500 switches.

Table 17. Well-Known IP Multicast Address Groups Excluded from IGMP Filtering

Groups of Consecutive Addresses in the Range of 224.0.0.X to 239.0.0.X*

Groups of Consecutive Addresses in the Range of 224.128.0.X to 239.128.0.X*

224.0.0.x

232.0.0.x

224.128.0.x

232.128.0.x

225.0.0.x

233.0.0.x

225.128.0.x

233.128.0.x

226.0.0.x

234.0.0.x

226.128.0.x

234.128.0.x

227.0.0.x

235.0.0.x

227.128.0.x

235.128.0.x

228.0.0.x

236.0.0.x

228.128.0.x

236.128.0.x

229.0.0.x

237.0.0.x

229.128.0.x

237.128.0.x

230.0.0.x

238.0.0.x

230.128.0.x

238.128.0.x

231.0.0.x

239.0.0.x

231.128.0.x

239.128.0.x

*X is any value from 0 to 255.

Switch Memory Operation

If you are using the CLI to change the switch configuration, HP recommends that you use the write memory command to permanently save the changes (to the startup-config file) before exiting from the CLI. CLI configuration changes are not saved from the Menu interface to the startup-config file unless you make a configuration change in the Menu interface before using the Save command. That is, if you use the CLI to make a change to the running-config file and then go to the Menu interface and execute a Save command without making a configuration change in the Menu interface, the CLI change made to the running-config file is not saved to the startup-config file. (You can still save the change by returning to the global configuration level in the CLI and executing write memory). For more on memory operation, see appendix C, "Switch Memory and Configuration" in the ProCurve Series 2500 Switches Management and Configuration Guide shipped with your switch and also available at http://www.procurve.com. (Click on technical support, then manuals.) See also "Incomplete Information on Saving Configuration Changes" on page 223.

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