3com S7906E 설치 설명서

1-30 

To do... 

Use the command... 

Remarks 

Disable the SPT switchover  

spt-switch-threshold infinity 
[ group-policy acl-number 
[ order order-value] ] 

Optional 

By default, the device switches 
to the SPT immediately after it 
receives the first multicast 
packet.  

 

For an S7900E Series Ethernet switch, once a multicast forwarding entry is created, subsequent 

multicast data will not be encapsulated in register messages before being forwarded even if a register 

outgoing interface is available. Therefore, to avoid forwarding failure, do not use spt-switch-threshold 

infinity command on a switch that may become an RP (namely, a static RP or a C-RP). 

 

 

The PIM-SSM model needs the support of IGMPv3. Therefore, be sure to enable IGMPv3 on PIM 

routers with multicast receivers.  

 

Complete these tasks to configure PIM-SSM:  

Task 

Remarks 

Required 

Configuring the SSM Group Range 

Optional 

Configuring PIM Common Features 

Optional 

 

Before configuring PIM-SSM, complete the following task:  

z 

Configure any unicast routing protocol so that all devices in the domain are interoperable at the 

network layer. 

Before configuring PIM-SSM, prepare the following data:  

z 

The SSM group range