H3C Technologies H3C S6800 Series Switches - Manual (Page 212)

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Step Command Remarks
7. Advertise routes to the UPE.
• Advertise a default VPN route
to the UPE:
peer { group-name | ip-address
[ mask-length ] }
default-route-advertise
vpn-instance
vpn-instance-name
• Advertise routes permitted by a
routing policy to the UPE:
peer { group-name | ip-address
[ mask-length ] } upe
route-policy route-policy-name
export
By default, no route is advertised to
the UPE.
Do not configure both commands.
The peer default-route-advertise
vpn-instance command advertises
a default route using the local
address as the next hop to the UPE,
regardless of whether the default
route is present in the local routing
table. However, if the specified
peer is not a UPE, the command
does not advertise a default route.
8. Return to BGP view. quit N/A
9. Create a BGP-VPN instance,
and enter BGP-VPN instance
view. ip vpn-instance vpn-instance-name
By default, no BGP-VPN instance is
created.
Configuring an OSPF sham link
When a backdoor link exists between the two sites of a VPN, you can create a sham link between PEs
to forward VPN traffic through the sham link on the backbone rather than the backdoor link. A sham link
is considered an OSPF intra-area route.
The source and destination addresses of the sham link must be loopback interface addresses with 32-bit
masks. The loopback interfaces must be bound to VPN instances, and their addresses are advertised
through BGP.
Before you configure an OSPF sham link, complete the following tasks:
• Configure basic MPLS L3VPN (OSPF is used between PE and CE).
• Configure OSPF in the LAN where customer CEs reside.
Configuring a loopback interface
Step Command Remarks
1. Enter system view. system-view N/A
2. Create a loopback interface
and enter loopback interface
view.
interface loopback
interface-number By default, no loopback interface is
created.
3. Associate the loopback
interface with a VPN instance.
ip binding vpn-instance
vpn-instance-name By default, the interface is
associated with no VPN instance.
4. Configure the address of the
loopback interface.
ip address ip-address { mask |
mask-length }
N/A