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DES-7200 Configuration Guide Chapter 2 Configuring BGP IP VPN
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Fig 14 Scenario II: MPLS core second-level ISP
As shown in Fig 14, the Second Carrier is the MPLS core and provides network access service
for users. Adjacency is established between ASBR1 and ASBR2 to exchange external routes.
The Internet-access traffic of user flows from ASBR1 into the network of Second Carrier and then
flows out of the Second Carrier network from ASBR2. When the traffic flows from ASBR1 to
ASBR2, the traffic is forwarded in the VPN LSP tunnel.
Scenario III: MPLS core second-level VPN provider
Fig 15 Scenario III: MPLS core second-level VPN provider
As shown in Fig 15, the Second Carrier is the MPLS core and provides MPLS L3VPN service for
users. MP-IBGP adjacency is established between PE3 and PE4 to exchange user's VPN routes.
The VPN LSP between PE3 and PE4 will act as the external tunnel of user VPN.
2.3.3.3 Configuration steps
CSC configuration involves: