Mpls l3vpn configuration task list, Configuring basic mpls l3vpn – H3C Technologies H3C S10500 Series Switches User Manual
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Figure 70 Application of BGP AS number substitution
, both CE 1 and CE 2 use the AS number of 800. AS number substitution is enabled on PE
2 for CE 2. Before advertising updates received from CE 1 to CE 2, PE 2 finds that an AS number in the
AS_PATH is the same as that of CE 2 and hence substitutes its own AS number 100 for the AS number.
In this way, CE 2 can normally receive the routing information from CE 1.
The AS number substitution function is also applicable to scenarios where a PE connects to multiple CEs
by using different interfaces, such as PE2 connecting to CE 2 and CE 3 in the figure.
MPLS L3VPN configuration task list
Complete the following tasks to configure MPLS L3VPN:
Task Remarks
Configuring BGP AS number substitution
By configuring basic MPLS L3VPN, you can construct
simple VPN networks over an MPLS backbone.
To deploy special MPLS L3VPN networks, such as
inter-AS VPN, nested VPN, and multi-role host, you
also need to perform some specific configurations in
addition to the basic MPLS L3VPN configuration. See
the related sections for details.
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
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
Optional
Configuring routing between PE and CE
Required