Configuring An Ospf Sham Link; Configuring A Loopback Interface - HP 6127xlg Configuration Manual

Step
7. Advertise routes to the UPE.
8. Return to BGP view.
9. Create a BGP-VPN instance,
and enter BGP-VPN instance
view.

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
1. Enter system view.
2. Create a loopback interface
and enter loopback interface
view.
3. Associate the loopback
interface with a VPN instance.
4. Configure the address of the
loopback interface.
Command
•
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
quit
ip vpn-instance vpn-instance-name
Command
system-view
interface loopback
interface-number
ip binding vpn-instance
vpn-instance-name
ip address ip-address { mask |
mask-length }
199
Remarks
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.
N/A
By default, no BGP-VPN instance is
created.
Remarks
N/A
By default, no loopback interface is
created.
By default, the interface is
associated with no VPN instance.
N/A