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Configuring MPLS L3VPN carrier's carrier in different ASs
Network requirements
Configure carrier's carrier for the scenario shown in
•
PE 1 and PE 2 are the provider carrier's PE routers. They provide VPN services for the
customer carrier.
•
CE 1 and CE 2 are the customer carrier's routers. They are connected to the provider carrier's
backbone as CE routers.
•
PE 3 and PE 4 are the customer carrier's PE routers. They provide MPLS L3VPN services for
the end customers.
•
CE 3 and CE 4 are customers of the customer carrier.
•
The customer carrier and the provider carrier reside in different ASs.
The key to carrier's carrier deployment is to configure exchange of two kinds of routes:
•
Exchange of the customer carrier's internal routes on the provider carrier's backbone.
•
Exchange of the end customers' VPN routes between PE 3 and PE 4, the PEs of the customer
carrier. In this process, an MP-EBGP peer relationship must be established between PE 3 and
PE 4.
Figure 77 Network diagram
Table 20 Interface and IP address assignment
Device
CE 3
PE 3
CE 1
Interface
IP address
GE2/0/1
100.1.1.1/24
Loop0
1.1.1.9/32
GE2/0/1
100.1.1.2/24
POS2/2/1
10.1.1.1/24
Loop0
2.2.2.9/32
POS2/2/0
10.1.1.2/24
POS2/2/1
11.1.1.1/24
Figure
77. In this scenario:
Device
CE 4
PE 4
CE 2
282
Interface
IP address
GE2/0/1
120.1.1.1/24
Loop0
6.6.6.9/32
GE2/0/1
120.1.1.2/24
POS2/2/1
20.1.1.2/24
Loop0
5.5.5.9/32
POS2/2/0
21.1.1.2/24
POS2/2/1
20.1.1.1/24
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