Configuring Level 1 Carrier CE to Access the Level 1 Carrier PE (Intra-AS)

If the Level 1 carrier and the Level 2 carrier are in the same AS, the Level 1 carrier takes the Level 2 carrier as its VPN user. The configuration of carrier's carrier is similar to the configuration of CE accessing PE in the basic BGP/MPLS IP VPN.

Procedure

Create a VPN instance on the Level 1 carrier PE.
1. Run system-view
  The system view is displayed.
2. Run ip vpn-instance vpn-instance-name
  A VPN instance is created and the VPN instance view is displayed.
3. Run ipv4-family
  The IPv4 address family is enabled for the VPN instance and the VPN instance IPv4 address family view is displayed.
4. Run route-distinguisher route-distinguisher-name
  The RD of the VPN instance IPv4 address family is set.
5. Run apply-label per-route
  Each route is allocated a label.
6. Run vpn-target vpn-target &<1-8> [ both | export-extcommunity | import-extcommunity ]
  One or multiple VPN targets are configured for the VPN instance IPv4 address family.
7. Run quit
  Return to the system view.
8. Run interface interface-type interface-number
  The view of the interface connected to the Level 1 carrier CE is displayed.
9. Run ip binding vpn-instance vpn-instance-name
  The interface is bound to the VPN instance.
10. Run ip address ip-address { mask | mask-length }
  An IP address is configured for the interface.
11. Run commit
  The configuration is committed.
Configure LDP and an IGP on the Level 1 carrier PE.
1. Run system-view
  The system view is displayed.
2. Run mpls ldp vpn-instance vpn-instance-name
  LDP is enabled for the created VPN instance.
3. Run quit
  Return to the system view.
4. Run interface interface-type interface-number
  The view of interface connected to the Level 1 carrier CE is displayed.
5. Run mpls
  MPLS is enabled on the interface.
6. Run mpls ldp
  LDP is enabled on the interface.
7. Run quit
  Return to the system view.
8. Configure an IGP between the Level 1 carrier PE and the Level 1 carrier CE.
  The RIP multi-instance, the OSPF multi-instance or the IS-IS multi-instance can be used on PE as an IGP between the PE and the Level 1 carrier CE. In the IGP multi-instance view, BGP routes are imported; in the BGP-VPN instance view, IGP routes are imported. The detailed configuration is not mentioned here.
Configure LDP and an IGP on the Level 1 carrier CE.
1. Run system-view
  The system view is displayed.
2. Run interface interface-type interface-number
  The view of interface connected to the Level 1 carrier PE is displayed.
3. Run ip address ip-address { mask | mask-length }
  An IPv4 address is configured for the interface.
4. Run mpls
  MPLS is enabled on the interface.
5. Run mpls ldp
  LDP is enabled on the interface.
6. (Optional) Run mpls ldp transport-address interface
  The IP address of the current interface is used to establish an LDP session.
  
  If the interface is not bound to a VPN instance, by default, the LSR ID is used as the transport address for the local LDP session.
  
  The transport address is used to establish a TCP connection between the local node and its peer. The peer must have a reachable route to this transport address. The default transport address is the loopback interface address (an LSR ID). When the address of the loopback interface is a public network address, configure different transport addresses for LSRs so that LSRs can set up connections to private network addresses.
7. Run quit
  Return to the system view.
8. Configure an IGP between the Level 1 carrier CE and the Level 1 carrier PE.
  RIP, OSPF or IS-IS can be used on the CE as an IGP between the CE and the Level 1 carrier PE. The detailed configuration is not mentioned here.