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Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide
OL-16506-17
Chapter 18 LSM-MLDP-based MVPN Support
MVPN MLDP over GRE
MVPN MLDP over GRE
The Multicast Label Distribution Protocol- based Multicast VPN (MVPN) feature supports IPv4 and
IPv6 multicast traffic over a Multi-Protocol Label Switching (MPLS) network. But a large part of the
network infrastructure is still IP network, and the legacy IP network does not support MPLS. The
existing MPLS over Generic Routing Encapsulation (GRE) feature provides a mechanism for tunneling
MPLS packets over a non-MPLS network by creating a GRE tunnel across the IP network and bridging
the separated MPLS networks. However, the existing MPLS over GRE feature does not support MPLS
multicast traffic. The MVPN MLDP over GRE feature provides a solution by supporting encapsulating
MPLS multicast traffic in the GRE tunnel.
Figure 18-2 shows a sample configuration for MVPN Multicast Label Distribution Protocol over GRE
using the PE-PE network topology.
Figure 18-2 MVPN MLDP over GRE with PE-PE Network Topology
Prerequisites for MVPN MLDP over GRE
• Ensure that MPLS Virtual Private Network (MVPN) is configured and working properly. For
information about setting up MPLS VPNs, see:
http://www.cisco.com/en/US/docs/ios-xml/ios/mp_l3_vpns/configuration/xe-3s/asr1000/mp-cfg-la
yer3-vpn.html
• Ensure that Multiprotocol Border Gateway Protocol (MP-BGP) is configured and working properly.
For more information about configuring (MP-BGP), see:
http://www.cisco.com/en/US/docs/ios-xml/ios/mp_l3_vpns/configuration/xe-3s/asr1000/mp-bgp-
mpls-vpn.html
Restrictions for MVPN MLDP over GRE
The following are the restrictions that you will encounter while configuring the MVPN MLDP over GRE
feature:
• MVPN MLDP over GRE supports only IPv4 GRE.
IPv4
(No MPLS)
PE1 PE2
GRE Tunnel
MLDP over GRE
MPLS/VPN