Virtual Private Routed Network Services
7210 SAS M Services Guide Page 641
mdt
Syntax mdt
Context config>service>vprn>pim>interface
Description This command enables the context for a multicast distribution tree (MDT) to carry multicast traffic
from customer sites associated with the multicast domain. Multicast-capable routers create
distribution trees that control the path that IP multicast traffic takes through the network to deliver
traffic to all receivers. There are two types of MDTs, source trees and shared trees. The root of the
source tree is the source of the multicast tree whose branches form a spanning tree through the
network to the receivers. It is also referred to as a shortest path tree (SPT) because the tree uses the
shortest path through the network.
Shared trees use a common root that is placed at a specific place in the network. This shared root is
called the rendezvous point (RP).
All PEs that are configured with the same MDT address will become members of this group and
receive multicast traffic from each other.
The source address used in MDT group address packets is the loopback address configured for the
VPRN, if the loopback address is removed the service we will attempt to find another loop-back
address for the VPRN instance, if no loopback address exists then multicast tunnel for the VPRN
instance will be administratively down. The show command will reflect the reason why the PIM-SM
instance is down.
Addressing conflicts in the core can be avoided by installing import policies on the main PIM access
interfaces.
To enable multicast in a VPRN this parameter must be configured. If it is not configured, no PIM-SM
will not be initialized for this VPRN, and the show command will indicate that the default MDT
address is missing. If the address is removed using the no form of this command, Multicast will be
shut down for this instance and an error indication is displayed when a show command is executed.
Use the no form of this command to remove default MDT address from the configuration.
Default none
data
Syntax data {grp-ip-address/mask | grp-ip-address netmask}
Context config>service>vprn>pim>mdt
Description This command configures a pool of addresses that can be used to generate data only MDT tunnels.
Parameters grp-ip-address — The multicast group IP address expressed in dotted decimal notation.
Values 224.0.0.0 — 239.255.255.255
mask — The mask associated with the IP prefix expressed as a mask length or in dotted decimal
notation; for example /16 for a sixteen-bit mask. The mask can also be entered in dotted decmial
notation (255.255.0.0).
Values 4 — 32
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