3com S7906E 설치 설명서

 

1-35 

   Total 1 IGMP Group reported 

    Group Address    Last Reporter    Uptime    Expires 

    224.1.1.1        0.0.0.0          00:00:06  00:02:04 

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                (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. 

            GE2/0/4                (D) 

    MAC group(s): 

      MAC group address:0100-5e01-0101 

          Host port(s):total 1 port. 

            GE2/0/4 

A switch fails to implement Layer 2 multicast forwarding.  

IGMP snooping is not enabled. 

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.