3com S7906E Guia De Referência
1-13
Description
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.
Examples
# 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
Syntax
multicast forwarding-table downstream-limit limit
undo multicast forwarding-table downstream-limit
View
System view, VPN instance view
Default Level
2: System level
Parameters
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.
Description
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.