Dell PowerConnect 8100 CLI Reference Guide - Page 1149
User Guidelines, Example, ip multicast ttl-threshold, Syntax
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User Guidelines Use of a multicast routing protocol is recommended (e.g., PIM, when ip multicast is enabled). Unless required, IGMP/MLD snooping should be disabled when ip multicast is enabled. If a multicast source is connected to a VLAN on which both L3 multicast and IGMP/MLD snooping are enabled, the multicast source is forwarded to the mrouter ports that have been discovered when the multicast source is first seen. If a new mrouter is later discovered on a different port, the multicast source data is not forwarded to the new port. Likewise, if an existing mrouter times out or stops querying, the multicast source data continues to be forwarded to that port. If a host in the VLAN subsequently joins or leaves the group, the list of mrouter ports is updated for the multicast source and the forwarding of the multicast source is adjusted. The workaround to this limitation is to statically configure mrouter ports when enabling IGMP/MLD snooping in L3 multicast enabled VLANs. Example The following example enables IP multicast on the router. console#configure console(config)#ip multicast console(config)#ip igmp ip multicast ttl-threshold Use the ip multicast ttl-threshold command in Interface Configuration mode to apply a ttlvalue to a routing interface. ttlvalue is the TTL threshold which is applied to the multicast Data packets forwarded through the interface. Syntax ip multicast ttl-threshold ttlvalue no ip multicast ttl-threshold • ttlvalue - Specifies TTL threshold. (Range: 0-255) Multicast Commands 1149
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