H3C Technologies H3C SR8800 - Manual (Page 256)

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Task Remarks
Configuring BGP AS number substitution
Configuring basic MPLS L3VPN
The key task in MPLS L3VPN configuration is to manage the advertisement of VPN routes on the MPLS
backbone, including PE-CE route exchange and PE-PE route exchange.
Complete the following tasks to configure basic MPLS L3VPN:
Task Remarks
Configuring VPN
instances
Creating a VPN instance Required
Associating a VPN instance with an interface Required
Configuring route related attributes for a VPN instance Optional
Configuring a tunneling policy for a VPN instance Optional
Configuring an LDP instance Optional
Configuring routing between PE and CE Required
Configuring routing between PEs Required
Configuring routing features for BGP VPNv4 subaddress family Optional
Configuration prerequisites
Before you configure basic MPLS L3VPN, complete the following tasks:
• Configure an IGP for the MPLS backbone (on the PEs and Ps) to achieve IP connectivity
• Configure basic MPLS for the MPLS backbone
• Configure MPLS LDP for the MPLS backbone so that LDP LSPs can be established
Configuring VPN instances
By configuring VPN instances on a PE, you can isolate not only VPN routes from public network routes,
but also routes of a VPN from those of another VPN. This feature allows VPN instances to be used in
networking scenarios besides MPLS L3VPNs.
All VPN instance configurations are performed on PEs or MCEs.
Creating a VPN instance
A VPN instance is associated with a site. It is a collection of the VPN membership and routing rules of its
associated site. A VPN instance does not necessarily correspond to one VPN.
A VPN instance takes effect only after you configure an RD for it.
You can configure a description for a VPN instance to record its related information, such as its
relationship with a certain VPN.
To create and configure a VPN instance: