Example For Configuring Ospf Sham Links - 3Com MSR 50 Series Configuration Manual

Example for Configuring
OSPF Sham Links
Network requirements
CE 1 and CE 2 belong to VPN 1 and are respectively connected to PE 1 and PE
■
2.
CE 1 and CE 2 are in the same OSPF area.
■
VPN traffic between CE 1 and CE 2 is required to be forwarded through the
■
MPLS backbone, instead of any route in the OSPF area.
Network diagram
Figure 430 Configure an OSPF sham link
PE 1
Eth1/0
Eth1 /0
S2/1
CE 1
Device Interface
CE 1 Eth 1/0
S 2/1
PE 1 Loop0
Loop1
Eth 1/0
S 2/1
Router A S 2/0
S 2/1
Configuration procedure
1 Configure OSPF on the customer networks
Configure conventional OSPF on CE 1, Router A, and CE 2 to advertise segment
addresses of the interfaces as shown in
steps are omitted.
After completing the configurations, CE 1 and CE 2 should be able to learn the
OSPF route to the Ethernet interface of each other. The following takes CE 1 as an
example:
<CE1> display ip routing-table
Routing Tables: Public
Destinations : 9
Destination/Mask
20.1.1.0/24
20.1.1.1/32
Loop 0
Loop 0
S2/1 S 2/0
Sham-link
Loop 1 Loop 1
OSPF Area 1
S2/1 S 2/0
Router A
Backdoor link
IP address Device
100.1.1.1/24 CE 2
20.1.1.1/24
1.1.1.9/32 PE 2
3.3.3.3/32
100.1.1.2/24
10.1.1.1/24
30.1.1.1/24
20.1.1.2/24
Figure
Routes : 9
Proto Pre Cost
Direct 0 0
Direct 0 0
MPLS L3VPN Configuration Example
PE 2
Eth1/0
Eth1 /0
S2 /1
CE 2
Interface
Eth 1/0
S 2/1
Loop0
Loop1
Eth 1/0
S 2/0
430. The detailed configuration
NextHop
20.1.1.1
127.0.0.1
1547
IP address
120.1.1.1/24
30.1.1.2/24
2.2.2.9/32
5.5.5.5/32
120.1.1.2/24
10.1.1.2/24
Interface
S2/1
InLoop0