Troubleshooting Igmp Snooping Configuration - 3Com S7906E Configuration Manual

Total 1 IGMP Group reported
Group Address
224.1.1.1
When Host A leaves the multicast group, it sends an IGMP leave message to Switch A. Receiving the
message, Switch A removes port GigabitEthernet 2/0/3 from the member port list of the forwarding entry
for the group; however, it does not remove the group or forward the leave message to Router A because
Host B is still in the group. Use the display igmp-snooping group command to display information
about IGMP snooping multicast groups. For example:
# Display information about IGMP snooping multicast groups on Switch A.
[SwitchA] display igmp-snooping group
Total 1 IP Group(s).
Total 1 IP Source(s).
Total 1 MAC Group(s).
Port flags: D-Dynamic port, S-Static port, C-Copy port
Subvlan flags: R-Real VLAN, C-Copy VLAN
Vlan(id):100.
Total 1 IP Group(s).
Total 1 IP Source(s).
Total 1 MAC Group(s).
Router port(s):total 1 port.
GE2/0/1
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):
Host port(s):total 1 port.
GE2/0/4
MAC group(s):
MAC group address:0100-5e01-0101
Host port(s):total 1 port.
GE2/0/4

Troubleshooting IGMP Snooping Configuration

Switch Fails in Layer 2 Multicast Forwarding
Symptom
A switch fails to implement Layer 2 multicast forwarding.
Analysis
IGMP snooping is not enabled.
Solution
1) Enter the display current-configuration command to view 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 igmp-snooping enable command to enable IGMP snooping in VLAN view.
3) If IGMP snooping is disabled only for the corresponding VLAN, just use the igmp-snooping
enable command in VLAN view to enable IGMP snooping in the corresponding VLAN.
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