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GE1/0/3 (D) ( 00:04:10 )

MAC group(s):

MAC group address:0100-5e01-0101

Host port(s):total 1 port.

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.

Assume that Source 2 starts sending multicast traffic to 224.1.1.1. Use the display multicast forwarding-

table to display the multicast forwarding table information.

# Display the information about 224.1.1.1 in the multicast forwarding table 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 to forward packets from Source 2 to 224.1.1.1, which

indicates that multicast packets from Source 2 are blocked.

Troubleshooting IGMP snooping configuration

Layer 2 multicast forwarding cannot function

Symptom

Layer 2 multicast forwarding cannot function.

Analysis

IGMP snooping is not enabled.

Solution

1. Use the display current-configuration command to display the running status of IGMP snooping.

2. If IGMP snooping is not enabled, use the igmp-snooping command to enable IGMP snooping

globally, and then use the igmp-snooping enable command to enable IGMP snooping in VLAN

view.

3. If IGMP snooping is disabled only for the corresponding VLAN, use the igmp-snooping enable

command in VLAN view to enable IGMP snooping in the corresponding VLAN.

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