H3C Technologies H3C S7500E Series Switches - Manual (Page 327)

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[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 Vlan12
30.1.1.0/24 OSPF 10 3125 100.1.1.1 Vlan12
100.1.1.0/24 Direct 0 0 100.1.1.2 Vlan12
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 Vlan12
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 above configurations, if you issue the display ip routing-table vpn-instance
command again on the PEs, you should 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
Destination/Mask Proto Pre Cost NextHop Interface
3.3.3.3/32 Direct 0 0 127.0.0.1 InLoop0
5.5.5.5/32 BGP 255 0 2.2.2.9 NULL0
20.1.1.0/24 OSPF 10 1563 100.1.1.1 Vlan12
100.1.1.0/24 Direct 0 0 100.1.1.2 Vlan12
100.1.1.2/32 Direct 0 0 127.0.0.1 InLoop0
120.1.1.0/24 BGP 255 0 2.2.2.9 NULL0
Issuing the display ip routing-table command on the CEs, you should see that the cost of the OSPF
route to the peer CE is now 10 (the cost configured for the sham link), and that the next hop is now the
VLAN interface 1 connected to the PE. This means that VPN traffic to the peer will be forwarded over
the backbone. Takes CE 1 as an example:
[CE1] display ip routing-table