3com S7906E 설치 설명서

1-16 

To do... 

Use the command... 

Description  

Enable IP multicast routing 

Required 

Disabled by default  

Enter interface view 

interface interface-type 
interface-number 

— 

Enable PIM-DM 

pim dm 

Required  

Disabled by default 

 

z 

All the interfaces in the same VPN instance on the same device must work in the same PIM mode. 

z 

PIM-DM does not work with multicast groups in the SSM group grange.  

 

z 

For details about the ip vpn-instance and route-distinguisher commands, see MPLS L3VPN 

Commands in the MPLS Volume. 

z 

For details about the multicast routing-enable command, see Multicast Routing and Forwarding 

Commands in the IP Multicast Volume. 

 

Pruned interfaces resume multicast forwarding when the pruned state times out. To prevent this, the 

router with the multicast source attached periodically sends an (S, G) state-refresh message, which is 

forwarded hop by hop along the initial multicast flooding path of the PIM-DM domain, to refresh the 

prune timer state of all the routers on the path. A multi-access subnet can have the state-refresh 

capability only if the state-refresh capability is enabled on all PIM routers on the subnet.  

Follow these steps to enable the state-refresh capability: 

To do... 

Use the command... 

Remarks 

Enter system view 

— 

Enter interface view 

interface interface-type 
interface-number 

— 

Enable state-refresh  

pim state-refresh-capable 

Optional 

Enabled by default  

 

The router directly connected with the multicast source periodically sends state-refresh messages. You 

can configure the interval for sending such messages.