H3C Technologies H3C S12500 Series Switches - Manual (Page 268)

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Multi-hop EBGP interconnectivity
As shown in Figure 75 , a VPN network involves AS 1 and AS 2. PE 3 and PE 4 are the autonomous
system boundary router (ASBR) for AS 1 and AS 2 respectively. PE 3 and PE 4 are interconnected through
the public network and treat each other as a P device.
Figure 75 Multi-hop EBGP interconnectivity
By using this method, only one MD needs to be established for all the ASs, and public network multicast
traffic between different ASs is transmitted within this MD.
Multicast VPN configuration task list
CAUTION:
When the system is operating in standard mode, a reserved VLAN must be configured if multicast VPN
will be configured. Otherwise, abnormality might occur in the system. After a reserved VLAN is
configured, any change to it will incur reconfiguration of the reserved VLAN. For more information about
the system operating mode, see Fundamentals Configuration Guide. For more information about a
reserved VLAN, see MPLS Configuration Guide and MPLS Command Reference.
Complete the following tasks to configure multicast VPN:
Task Remarks
Configuring MD-VPN
Enabling IP multicast routing in a VPN instance Required.
Configuring a share-group and an MTI binding Required.
Configuring MDT switchover parameters Optional.
Enabling switch-group reuse logging Optional.
Configuring BGP MDT
Configuring BGP MDT peers or peer groups Required.
Configuring a BGP MDT route reflector Optional.
Configuring MD-VPN
Before you configure MD-VPN, complete the following tasks:
• Configure any unicast routing protocol to provide intra-domain interoperability at the network layer.
• Configure MPLS L3VPN.