3com S7906E 설치 설명서

 

1-17 

 

Configuring Source IP Address of IGMP Queries  

Upon receiving an IGMP query whose source IP address is 0.0.0.0 on a port, the switch does not enlist 

that port as a dynamic router port. This may prevent multicast forwarding entries from being correctly 

created at the data link layer and cause multicast traffic forwarding failure in the end. When a Layer 2 

device acts as an IGMP-Snooping querier, to avoid the aforesaid problem, you are commended to 

configure a non-all-zero IP address as the source IP address of IGMP queries.  

Follow these steps to configure source IP address of IGMP queries:  

Enter system view 

system-view 

— 

Enter VLAN view 

vlan vlan-id 

— 

Configure the source address 
of IGMP general queries  

igmp-snooping general-query source-ip 
{ ip-address | current-interface } 

Optional 

0.0.0.0 by default 

Configure the source IP 
address of IGMP group-specific 
queries 

igmp-snooping special-query source-ip 
{ ip-address | current-interface } 

Optional 

0.0.0.0 by default 

 

The source address of IGMP query messages may affect IGMP querier selection within the segment.  

 

Before configuring IGMP snooping Proxying in a VLAN, enable IGMP snooping in the VLAN and 

prepare the following data: 

z 

Source IP address for the IGMP reports sent by the proxy 

z 

Source IP address for the IGMP leave messages sent by the proxy 

The IGMP snooping Proxying function works on a per-VLAN basis. After you enable the function in a 

VLAN, the device works as the IGMP snooping proxy for the downstream hosts and upstream router in 

the VLAN.  

Follow these steps to enable IGMP snooping Proxying in a VLAN:  

Enter system view 

— 

Enter VLAN view 

vlan vlan-id 

— 

Enable IGMP snooping 
Proxying in the VLAN 

igmp-snooping proxying 
enable 

Required 

Disabled by default.