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The Dissemination Process provides a method to dynamically configure multicast sessions on switches with VLANs that do not have IP interfaces. See Figure�211.
Figure�211:�LGMP and CGMP Snooping
Switch 1 will route the multicast traffic from the Multicast Server on VLAN 1 to VLAN 2. Switch 2 does not have an IP interface on VLAN 2. Because the Learning Process requires an IP interface to perform learning, a different method must be used to create multicast sessions on Switch 2. Switch 1 must disseminate the Intelligent Multicast information to all switches on the attached VLANs that do not have IP interfaces. Two protocols are available for this use on the Switch, LGMP and CGMP.
LGMP and CGMP are similar protocols. Both protocols have a server implementation that runs on a switch that implements the Learning Process, and both protocols have a client implementation which runs on switches that do not have local IP interfaces on all involved VLANs. For the Avaya Multiservice switch, only the client implementation of CGMP is available in case the switch is connected to a Cisco router. This implementation is called CGMP Snooping.
Note: IGMP Snooping must be enabled to learn the sessions that the LGMP server will disseminate. An LGMP server is active only for VLANs that have an IGMP interface enabled.
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