3com S7906E Guide De Référence

 

1-13 

Use the multicast boundary command to configure a multicast forwarding boundary.  

Use the undo multicast boundary command to remove a multicast forwarding boundary.  

By default, no multicast forwarding boundary is configured.  

Note that:  

z 

A multicast forwarding boundary sets the boundary condition for the multicast groups in the 

specified range. If the destination address of a multicast packet matches the set boundary 

condition, the packet will not be forwarded.  

z 

If an interface needs to act as a forwarding boundary for multiple multicast groups, just carry out 

this command on the interface once for each group.  

z 

Assume that Set A and Set B are both multicast forwarding boundary sets to be configured, and B 

is a subset of A. If A has been configured on an interface, it is not allowed to configure B on the 

interface; if B has been configured on the interface before A is configured, the previously 

configured B will be removed.  

Related commands: display multicast boundary.  

# Configure VLAN-interface 100 to be the forwarding boundary of multicast group 239.2.0.0/16.  

<Sysname> system-view 

[Sysname] interface vlan-interface 100 

[Sysname-Vlan-interface100] multicast boundary 239.2.0.0 16 

multicast forwarding-table downstream-limit limit 

undo multicast forwarding-table downstream-limit 

System view, VPN instance view 

2: System level 

limit: Maximum number of downstream nodes (namely, the maximum number of outgoing interfaces) for 

a single multicast forwarding entry. The value ranges from 0 to 128.  

Use the multicast forwarding-table downstream-limit command to configure the maximum number 

of downstream nodes for a single entry in the multicast forwarding table.  

Use the undo multicast forwarding-table downstream-limit command to restore the system default.  

By default, the maximum number of downstream nodes for a single multicast forwarding entry is the 

maximum number allowed by the system, namely 128.  

The system-allowed maximum number varies with different device models.