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1-9
Figure 1-7
Details about an IGMP snooping multicast entry
describes the IGMP snooping multicast entry information.
Table 1-5
Description of IGMP snooping multicast entries
Item
Description
VLAN ID
ID of the VLAN to which the entry belongs
Source Address
Multicast source address, where 0.0.0.0 indicates all multicast sources.
Group Address
Multicast group address
Router Port(s)
All router ports
Member Port(s)
All member ports
IGMP Snooping Configuration Examples
Network requirements
z
As shown in
, Router A connects to a multicast source (Source) through Ethernet 1/2,
and to Switch A through Ethernet 1/1.
z
The multicast source sends multicast data to group 224.1.1.1. Host A is a receiver of the multicast
group.
group.
z
IGMPv2 runs on Router A and IGMP snooping version 2 runs on Switch A.
z
The function of dropping unknown multicast packets is enabled on Switch A to prevent Switch A
from flooding multicast packets in the VLAN if no corresponding Layer 2 forwarding entry exists.
from flooding multicast packets in the VLAN if no corresponding Layer 2 forwarding entry exists.
z
The fast leave function is enabled for GigabitEthernet 1/0/3 on Switch A to improve bandwidth and
resource usage.
resource usage.