Configuring Ospf Multi-Instance Sham Link - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide
[UPE] bgp 100
[UPE-bgp] group 1
[UPE-bgp] peer 1.0.0.2 group 1
[UPE-bgp] peer 1.0.0.2 connect-interface loopback0
[UPE-bgp] ipv4-family vpnv4
[UPE-bgp-af-vpn] peer 1 enable
[UPE-bgp-af-vpn] peer 1.0.0.2 group 1
# Configure OSPF
[UPE] ospf
[UPE-ospf] area 0
[UPE-ospf-area-0.0.0.0] network 0.0.0.0 0.0.0.0
[UPE-ospf-area-0.0.0.0] import-route direct
[UPE-ospf-area-0.0.0.0] quit

3.4.8 Configuring OSPF Multi-Instance Sham Link

I. Network requirements
A company is connected into Wide Area Network (WAN) through routers with OSPF
multi-instance enabled. OSPF is bound to the VPN1 and run between PE and CE. PEs
are connected over MPLS VPN backbone network. A sham link is configured between
PE1 and PE2, so that the traffic between CE1 and CE2 will be transferred along the
backdoor links.
II. Network diagram
10.10.10.10 10.10.10.10
s0/0/0 s0/0/0
12.1.1.0/24 12.1.1.0/24
s0/0/0 s0/0/0
20.20.20.20 20.20.20.20
Figure 3-20 Network diagram for OSPF multi-instance
LoopBack0: 1.1.1.1 LoopBack0: 1.1.1.1
CE1 CE1
PE1 PE1
1.1.1.1 1.1.1.1
s1/0/0 s1/0/0 s1/0/0 s1/0/0
10.1.1.0/24 10.1.1.0/24
s0/0/0 s0/0/0
Sham link Sham link
(backdoor) (backdoor)
20.1.1.0/24 20.1.1.0/24
s1/0/0 s1/0/0
CE2 CE2
3Com Corporation
Chapter 3 BGP/MPLS VPN Configuration
LoopBack0: 3.3.3.3 LoopBack0: 3.3.3.3
s2/0/0 s2/0/0
LoopBack1: LoopBack1:
s2/0/0 s2/0/0
50.1.1.1 50.1.1.1
s0/0/0 s0/0/0
MPLS VPN Backbone MPLS VPN Backbone
(168.1.1.0/24) (168.1.1.0/24)
s0/0/0 s0/0/0 s2/0/0 s2/0/0
LoopBack1:50.1.1.2 LoopBack1:50.1.1.2
s1/0/0 s1/0/0
PE2 PE2
2.2.2.2 2.2.2.2
LoopBack0: 2.2.2.2 LoopBack0: 2.2.2.2
3-63
PE3 PE3
3.3.3.3 3.3.3.3
LoopBack1: LoopBack1:
50.1.1.3 50.1.1.3