113
•
The network is a Layer 2-only network.
•
Host A and Host B are receivers of multicast group 224.1.1.1.
•
All host receivers run IGMPv2, and all switches run IGMPv2 snooping. Switch A (which is close
to the multicast source) acts as the IGMP querier.
Configure the switches to meet the following requirements:
•
To prevent the switches from flooding unknown packets in the VLAN, enable dropping unknown
multicast packets on all the switches.
•
A switch does not mark a port that receives an IGMP query with source IP address 0.0.0.0 as a
dynamic router port. This adversely affects the establishment of Layer 2 forwarding entries and
multicast traffic forwarding. To avoid this situation, configure the source IP address of IGMP
queries as a non-zero IP address.
Figure 34 Network diagram
Configuration procedure
1.
Configure Switch A:
a.
From the navigation tree, select
Network
>
Multicast
>
IGMP Snooping
.
b.
Enable IGMP snooping for VLAN 1.
c.
Specify the IGMP snooping version as 2.
d.
Enable dropping unknown multicast data.
e.
Enable the switch to act as the IGMP querier.
f.
Set the source IP address to 192.168.1.10 for IGMP general queries and IGMP
group-specific queries.
2.
Configure Switch B:
a.
From the navigation tree, select
Network
>
Multicast
>
IGMP Snooping
.
b.
Enable IGMP snooping for VLAN 1.
c.
Specify the IGMP snooping version as 2.
d.
Enable dropping unknown multicast data.
3.
Configure Switch C:
Source 1
192.168.1.1/24
Switch A
Querier
Switch B
Switch C
G
E1
/0/1
GE1/0/1
GE1/0/1
G
E1
/0/2
GE1/0/3
GE1/0/2
GE1/0/2
Receiver
Host B
192.168.1.3/24
Receiver
Host A
192.168.1.2/24
VLAN 1