239
Figure 21 Network diagram for inter-AS option C
To improve the scalability, you can specify an RR in each AS, making it maintain all VPN-IPv4 routes and
exchange VPN-IPv4 routes with PEs in the AS. The RRs in two ASs establish an inter-AS VPNv4
connection to advertise VPN-IPv4 routes.
Figure 22 Network diagram for inter-AS option C using RRs
Carrier's carrier
It is possible that a customer of the MPLS L3VPN service provider is also a service provider. In this case,
the MPLS L3VPN service provider is called the provider carrier or the Level 1 carrier, while the customer
is called the customer carrier or the Level 2 carrier. This networking model is referred to as carrier's carrier.
In this model, the Level 2 service provider serves as a CE of the Level 1 service provider.
For good scalability, the Level 1 carrier does not redistribute the routes of the customer network
connected to a Level 2 carrier. It only redistributes the routes for delivering packets between different sites
of the Level 2 carrier. Routes of the customer networks connected to a Level 2 carrier are exchanged
VPN 1
CE 1
PE 1
PE 3
VPN 1
CE 3
CE 2
VPN 2 VPN 2
PE 2
PE 4
ASBR 1
(PE)
ASBR 2
(PE)
VPN LSP
CE 4
EBGP
AS 100 AS 200
MP-IBGP
MP-IBGP
MP-IBGP
M
P
-IBGP
Multi-hop MP-EBGP
Multi-hop MP-EBGP
MPLS backbone MPLS backbone
LSP
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