H3C Technologies H3C S10500 Series Switches - Manual (Page 345)

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[PE2-ospf-100-area-0.0.0.1] quit
[PE2-ospf-100] quit
[PE2] bgp 100
[PE2-bgp] ipv4-family vpn-instance vpn1
[PE2-bgp-vpn1] import-route ospf 100
[PE2-bgp-vpn1] import-route direct
[PE2-bgp-vpn1] quit
[PE2-bgp] quit
After completing the configurations, issue the display ip routing-table vpn-instance command on the PEs,
you can see that the path to the peer CE is along the OSPF route across the customer networks, instead
of the BGP route across the backbone. Take PE 1 as an example:
[PE1] display ip routing-table vpn-instance vpn1
Routing Tables: vpn1
Destinations : 5 Routes : 5
Destination/Mask Proto Pre Cost NextHop Interface
20.1.1.0/24 OSPF 10 1563 100.1.1.1 Vlan11
30.1.1.0/24 OSPF 10 3125 100.1.1.1 Vlan11
100.1.1.0/24 Direct 0 0 100.1.1.2 Vlan11
100.1.1.2/32 Direct 0 0 127.0.0.1 InLoop0
120.1.1.0/24 OSPF 10 3126 100.1.1.1 Vlan11
4. Configure a sham link
# Configure PE 1.
[PE1] interface loopback 1
[PE1-LoopBack1] ip binding vpn-instance vpn1
[PE1-LoopBack1] ip address 3.3.3.3 32
[PE1-LoopBack1] quit
[PE1] ospf 100
[PE1-ospf-100] area 1
[PE1-ospf-100-area-0.0.0.1] sham-link 3.3.3.3 5.5.5.5 cost 10
[PE1-ospf-100-area-0.0.0.1] quit
[PE1-ospf-100] quit
# Configure PE 2.
[PE2] interface loopback 1
[PE2-LoopBack1] ip binding vpn-instance vpn1
[PE2-LoopBack1] ip address 5.5.5.5 32
[PE2-LoopBack1] quit
[PE2] ospf 100
[PE2-ospf-100] area 1
[PE2-ospf-100-area-0.0.0.1] sham-link 5.5.5.5 3.3.3.3 cost 10
[PE2-ospf-100-area-0.0.0.1] quit
[PE2-ospf-100] quit
After completing the configurations, issue the display ip routing-table vpn-instance command again on
the PEs, you can see that the path to the peer CE is now along the BGP route across the backbone, and
that a route to the sham link destination address is present. Take PE 1 as an example:
[PE1] display ip routing-table vpn-instance vpn1
Routing Tables: vpn1
Destinations : 6 Routes : 6