50
GE1/0/1 (D) ( 00:01:30 )
IP group(s):the following ip group(s) match to one mac group.
IP group address:224.1.1.1
(0.0.0.0, 224.1.1.1):
Attribute: Host Port
Host port(s):total 1 port(s).
GE1/0/3 (D) ( 00:04:10 )
MAC group(s):
MAC group address:0100-5e01-0101
Host port(s):total 1 port(s).
GE1/0/3
The output shows that GigabitEthernet 1/0/3 on Switch B has joined 224.1.1.1 but not 224.1.1.2.
This means that the user control policy on Switch B has taken effect.
2.
Verify that Host A can receive only the multicast traffic from Source 1 to the multicast group
224.1.1.1.
# Send multicast traffic from Source 2 to the multicast group 224.1.1.1. (Details not shown.)
# Display information about the multicast group 224.1.1.1 on Switch A.
[SwitchA] display multicast forwarding-table 224.1.1.1
Multicast Forwarding Table of VPN-Instance: public net
Total 1 entry
Total 1 entry matched
00001. (1.1.1.1, 224.1.1.1)
MID: 0, Flags: 0x0:0
Uptime: 00:08:32, Timeout in: 00:03:26
Incoming interface: Vlan-interface101
List of 1 outgoing interfaces:
1: Vlan-interface104
Matched 19648 packets(20512512 bytes), Wrong If 0 packets
Forwarded 19648 packets(20512512 bytes)
The output shows that Switch A maintains a multicast forwarding entry for multicast packets
from Source 1 to 224.1.1.1. No forwarding entry exists for packets from Source 2 to 224.1.1.1,
which means that multicast packets from Source 2 are blocked.
Troubleshooting IGMP snooping
This section describes details about troubleshooting IGMP snooping.
Layer 2 multicast forwarding cannot function
Symptom
Layer 2 multicast forwarding cannot function.
Analysis
IGMP snooping is not enabled.
