H3C Technologies H3C S12500 Series Switches - Manual (Page 59)

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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(s).
GE3/0/1 (D)
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(s).
GE3/0/3 (D)
MAC group(s):
MAC group address:0100-5e01-0101
Host port(s):total 1 port(s).
GE3/0/3
Troubleshooting IGMP snooping
Layer 2 multicast forwarding cannot function
Symptom
Layer 2 multicast forwarding cannot function.
Analysis
IGMP snooping is not enabled.
Solution
1. Use 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 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.
Configured multicast group policy fails to take effect
Symptom
Although a multicast group policy has been configured to allow hosts to join specific multicast groups, the
hosts can still receive multicast data addressed to other multicast groups.
Analysis
• The ACL rule is incorrectly configured.
• The multicast group policy is not correctly applied.
• The function of dropping unknown multicast data is not enabled, so unknown multicast data is
flooded.