Configuring Inter-Provider Backbones Option B - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide
0.00% packet loss
round-trip min/avg/max = 70/142/190 ms

3.4.11 Configuring Inter-Provider Backbones Option B

I. Network requirements
CE1 and CE2 belong to the same VPN. CE1 accesses the network through PE1 in AS
100 and CE2 accesses the network through PE2 in AS 200.
Multi-AS BGP/MPLS VPN is implemented through Option B method. That is, VPN-IPv4
routes are advertised between ASBRs.
The MPLS backbone network in the same AS adopts OSPF as the IGP.
II. Network diagram
See Figure 3-22.
III. Configuration procedure
The configuration procedures include:
Configuring OSPF on the MPLS backbone network
Configuring basic MPLS capability on the MPLS backbone network
Configuring VPN instances on PEs
Configuring MP-BGP
Compared with Option A, Option B differs in the last two procedures.
1) Configuring OSPF on the MPLS backbone network to make PEs learn routes from
each other
Note:
In this part:
The configurations on PE1 and PE2 are the same as those in section 3.4.10
"Configuring Inter-Provider Backbones Option A".
Configuration of interface IP address between ASBR-PE1 and ASBR-PE2 is added.
# Configure PE1.
[PE1] interface loopback0
[PE1-LoopBack0] ip address 202.100.1.2 255.255.255.255
[PE1-LoopBack0] quit
[PE1] interface pos1/0/0
[PE1-Pos1/0/0] ip address 172.1.1.2 255.255.0.0
[PE1-Pos1/0/0] quit
[PE1] ospf
Chapter 3 BGP/MPLS VPN Configuration
3Com Corporation
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