Cisco Cisco IOS Software Release 15.0(1)S
MLDP-Based MVPN
Information About MLDP-Based MVPN
3
Figure 1
MLDP with the Default MDT Scenario
As shown in
, an MLDP-based MVPN also supports the dynamic creation of data MDTs for
high-bandwidth transmission. For high-rate data sources, a data MDT is created using P2MP LSPs to
off-load traffic from the default MDT to avoid unnecessary waste of bandwidth to PEs that did not join
the stream. The creation of the data MDT is signaled dynamically using MDT Join TLV messages. Data
MDTs are a feature unique to Cisco IOS software. Data MDTs are intended for high-bandwidth sources
such as full-motion video inside the VPN to ensure optimal traffic forwarding in the MPLS VPN core.
The threshold at which the data MDT is created can be configured on a per-router or a per-VRF basis.
When the multicast transmission exceeds the defined threshold, the sending PE router creates the data
MDT and sends a User Datagram Protocol (UDP) message, which contains information about the data
MDT to all routers on the default MDT.
off-load traffic from the default MDT to avoid unnecessary waste of bandwidth to PEs that did not join
the stream. The creation of the data MDT is signaled dynamically using MDT Join TLV messages. Data
MDTs are a feature unique to Cisco IOS software. Data MDTs are intended for high-bandwidth sources
such as full-motion video inside the VPN to ensure optimal traffic forwarding in the MPLS VPN core.
The threshold at which the data MDT is created can be configured on a per-router or a per-VRF basis.
When the multicast transmission exceeds the defined threshold, the sending PE router creates the data
MDT and sends a User Datagram Protocol (UDP) message, which contains information about the data
MDT to all routers on the default MDT.
Figure 2
MLDP with the Data MDT Scenario
Data MDTs are created only for (S, G) multicast route entries within the VRF multicast routing table.
They are not created for (*, G) entries regardless of the value of the individual source data rate.
They are not created for (*, G) entries regardless of the value of the individual source data rate.
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Default MDT
PIM join
PIM join
CE
Leaf PE
CE
CE
CE
Leaf PE
Leaf PE
Leaf PE
CE
Leaf PE
279245
Data MDT
CE
CE
CE
CE
Leaf PE
CE
Sender
Receiver
Receiver
Source
Leaf PE
Leaf PE
Leaf PE