Cisco Sg2008 Manual

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Multicast
This chapter describes how to configure the multicast protocols that forward 
packets from one source to multiple destinations.
It contains the following topics:
•Multicast Properties
•Configuring MAC Group Addresses
•Configuring Group-to-Port
•Configuring IGMP Snooping
•Configuring MLD Snooping
•Configuring IGMP Multicast Router Interfaces
•Configuring MLD Multicast Router Interfaces
Multicast protocols deliver packets from one...

Multicast
Multicast Properties
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Multicast entries can be learned by snooping (listening in on) the layer 3 protocols 
that manage multicast memberships:
•IPv4 multicast group addresses can be learned through the Internet Group 
Management protocol (IGMP).
•IPv6 multicast group addresses can be learned through the Multicast 
Listener Discovery (MLD) protocol. 
Interfaces with IGMP and MLD multicast routers for a specific VLAN can be either...

Multicast
Configuring MAC Group Addresses
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•Forward All—All multicast packets received from a VLAN are flooded to all 
ports in the VLAN, regardless of port registrations to multicast addresses.
•Filter Unregistered—If a packet is received from a VLAN for a multicast 
destination address and no ports in the VLAN are registered to receive 
multicast packets for that address, then the packets are dropped.
STEP  3Click Apply. Your changes are...

Multicast
Configuring MAC Group Addresses
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Viewing the MAC Group Address Table
To view the MAC Group Address Table, click Multicast > MAC Group Address in 
the navigation window.
By default, all entries display in the table. You can use the VLAN ID and MAC Group 
Address filters to display only entries that match the specified values. The 
following fields display:
•Type—Indicates whether the entry is statically configured or dynamically...

Multicast
Configuring Group-to-Port
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Configuring MAC Address Group Port Membership
By default, packets destined to a multicast MAC address are flooded on all ports. 
Ports might become members of a particular MAC address group dynamically 
through the exchange of IGMP packets, or you can statically configure them as 
members. 
To view details and configure the port members of a multicast group address:
STEP 1Select an entry on the MAC Group...

Multicast
Configuring IGMP Snooping
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STEP  4Set the type to indicate whether the entry is statically configured or dynamically 
learned. Ports can become members of a particular MAC address group 
dynamically through the exchange of IGMP packets, or you can statically configure 
them as members. 
STEP  5Click Apply. Your changes are saved to the Running Configuration.
Configuring IGMP Snooping
Internet Group Management Protocol (IGMP) is a...

Multicast
Configuring IGMP Snooping
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To configure IGMP snooping:
STEP 1Click Multicast > IGMP Snooping in the navigation window.
STEP  2Select Enable for the IGMP Snooping Status.
STEP  3Click Add in the IGMP Snooping Table.
STEP  4For VLAN ID, select the VLAN that is to support IGMP snooping.
STEP  5Configure the following settings:
•IGMP Fast Leave—Select Enable to allow the switch to immediately remove 
a port (or LAG) from its multicast...

Multicast
Configuring MLD Snooping
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STEP  7Ensure that an IGMP Mrouter interface has been configured for this VLAN (or all 
VLANs). See Configuring IGMP Multicast Router Interfaces.
Configuring MLD Snooping
MLD is a protocol used by IPv6 multicast routers to discover the presence of 
multicast listeners (nodes wishing to receive IPv6 multicast packets) on its 
directly-attached links and to discover which multicast packets are of interest to...

Multicast
Configuring MLD Snooping
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STEP  4For VLAN ID, select the VLAN that is to support MLD snooping.
STEP  5Enter the parameters:
•MLD Fast Leave Mode—Select Enable to allow the switch to immediately 
remove a port (or LAG) from its multicast forwarding table when it receives 
an MLD leave message for that multicast group. When enabled, the switch 
removes the port without first sending out MAC-based general queries to 
the interface....

Multicast
Configuring IGMP Multicast Router Interfaces
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Configuring IGMP Multicast Router Interfaces
An IGMP router must exist to manage the IGMP clients in a VLAN. For each VLAN 
that supports IGMP snooping, the switch must be statically configured with or 
must dynamically learn one or more interfaces where there is an IGMP router. An 
interface that has an IGMP router is known a IGMP Multicast router Interface. A 
VLAN that is IGMP...