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DES-7200 Configuration Guide Chapter 2 Configuring BGP IP VPN
2-129
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// In the user network, there are external routes (taking the edge device of user network 1 as
the example)
DES-7200# show ip route
DES-7200# show ip route
Codes: C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default
Gateway of last resort is no set
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B 61.10.55.0/24 [200/0] via 10.0.3.1, 00:00:40
C 64.21.33.0/24 is directly connected, gigabitEthernet 0/1
C 64.21.33.9/32 is local host.
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# Verify that the external networks are interconnected
// On the edge device of user network 1
DES-7200# ping 61.10.55.1 source 64.21.33.9
Sending 5, 100-byte ICMP Echoes to 61.10.55.1, timeout is 2 seconds:
Packet sent with a source address of 64.21.33.9
< press Ctrl+C to break >
!!!!!
2.5.10 CSC: Second Carrier provides
Internet service based on MPLS
core
2.5.10.1 Networking requirements
A carrier is providing Internet service for users in City A. Considering that it may need to provide
MPLS service for users in the future, this carrier has deployed MPLS on its backbone network.
Now this carrier intends to expand its service to City B, and has built MPLS network in City B. To
interconnect the core networks in two cities, this carrier leases the VPN service from another
MPLS VPN service provider. Therefore, this carrier has become a Second Carrier, while the
MPLS VPN service provider is the First Carrier.
The First Carrier PE and Second Carrier CE will exchange (internal) routes via BGP. The
Second Carrier will directly establish BGP neighbors between ASBRs to exchange external