HP 6125G Configuration Manual page 288

Step
2. Enter BGP view.
3. Enter BGP-VPN instance view.
4. Configure an EBGP peer.
5. Allow the local AS number to
appear in the AS_PATH
attribute of a received route,
and set the maximum number
of times that such case is
allowed to appear.
6. Redistribute remote site routes
advertised by the PE.
7. Configure a filtering policy to
filter the routes to be
advertised.
8. Configure a filtering policy to
filter the received routes.
BGP checks routing loops by examining AS numbers. When EBGP is used, the MCE advertises routing
information carrying the local AS number to the site and then receives routing updates from the site. The
routing updates carry the AS number of the MCE, so the MCE discards them to avoid routing loops. To
enable the MCE to receive such routes, configure the MCE to allow routing loops.
Routes redistributed from OSPF to BGP on the MCE have their OSPF attributes removed. To enable BGP
to distinguish routes redistributed from different OSPF domains, you must enable the redistributed routes
to carry the OSPF domain ID by configuring the domain-id command in OSPF view. The domain ID is
added to BGP VPN routes as an extended community attribute.
BGP runs in a BGP VPN instance in the same way as it runs in a normal network. For more information
about BGP, see Layer 3—IP Routing Configuration Guide.
Configure a VPN site:
2.
Step
1. Enter system view.
2. Enter BGP view.
3. Configure the MCE as the
EBGP peer.
4. Redistribute the IGP routes of
the VPN.
Command
bgp as-number
ipv4-family vpn-instance
vpn-instance-name
peer { group-name | ip-address }
as-number as-number
peer { group-name | ip-address }
allow-as-loop [ number ]
import-route protocol [ process-id
| all-processes ] [ med med-value |
route-policy route-policy-name ] *
filter-policy { acl-number |
ip-prefix ip-prefix-name } export
[ direct | ospf process-id | rip
process-id | static ]
filter-policy { acl-number |
ip-prefix ip-prefix-name } import
Command
system-view
bgp as-number
peer { group-name | ip-address }
as-number as-number
import-route protocol [ process-id ]
[ med med-value | route-policy
route-policy-name ] *
278
Remarks
N/A
N/A
N/A
Optional.
By default, no route redistribution
is configured.
Optional.
By default, BGP does not filter the
routes to be advertised.
Optional.
By default, BGP does not filter the
received routes.
Remarks
N/A
N/A
N/A
Optional.
A VPN site must advertise the VPN
network addresses it can reach to
the connected MCE.