User Manual

490
Users Manual of XGS-6350-24X4C
Take the tunnel technology as an example. When a router in a path does not support the multicast protocol,
the resolution is to configure the GRE tunnel between two routeres. In the following figure, each unicast router
supports only the unicast message; each multicast router supports only the multicast message. The source
host sends the multicast message to the destination host through MR1 and MR2. MR2 forwards the multicast
message only when it is received through the tunnel. When the destination host sends the unicast message to
the source host, the tunnel is also used. When the tunnel technology is adopted, the message transmission
speed is slower than that of the direct message transmission.
After the static multicast routing is configured, the router can perform the RPF check according to the
configuration information. The RPF check is not based on the unicast routing table any more. Therefore, the
multicast message goes through the tunnel, while the unicast message does not go through the tunnel. The
static multicast route only exists in the local place. It will not be announced or forwarded.
Run the following command in global configuration mode to configure the static multicast route:
Command Purpose
ip mroutesource-address mask
rpf-addresstypenumber[ distance]
Configures the static multicast route.
50.2.6 Configuring IP Multicast Boundary
Run the command ip multicast boundary to configure the multicast boundary for the port. Run the command
no ip multicast boundary to cancel the configured boundary. The commands used in the second
configuration will replace the commands used in the first configuration.
Command Purpose
ip multicast boundary access-list
Configures the multicast boundary for the
port.
Example
The following example shows how to configure the management boundary for a port:
interface ethernet 0/0
ip multicast boundary acl
ip access-list standard acl
permit 192.168.20.97 255.255.255.0