R3303-HP HSR6800 Routers MPLS Configuration Guide

295
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter BGP view.
bgp as-number N/A
3. Enter BGP-VPN instance
view.
ipv4-family vpn-instance
vpn-instance-name
N/A
4. Configure an EBGP peer.
peer { group-name | ip-address }
as-number as-number
N/A
5. Allow the local AS number
to appear in the AS_PATH
attribute of a received route
and set the maximum
number of repetitions.
peer { group-name | ip-address }
allow-as-loop [ number ]
Optional.
6. Redistribute remote site
routes advertised by the PE.
import-route protocol [ process-id |
all-processes ] [ med med-value |
route-policy route-policy-name ] *
By default, no route
redistribution is configured.
7. Configure a filtering policy
to filter the routes to be
advertised.
filter-policy { acl-number | ip-prefix
ip-prefix-name } export [ direct | isis
process-id | ospf process-id | rip process-id
| static ]
Optional.
By default, BGP does not
filter the routes to be
advertised.
8. Configure a filtering policy
to filter the received routes.
filter-policy { acl-number | ip-prefix
ip-prefix-name } import
Optional.
By default, BGP does not
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.
2. Configure the VPN site:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter BGP view.
bgp as-number N/A
3. Configure the MCE as the
EBGP peer.
peer { group-name | ip-address }
as-number as-number
N/A
4. Redistribute the IGP routes of
the VPN.
import-route protocol [ process-id ]
[ med med-value | route-policy
route-policy-name ] *
Optional.
A VPN site must advertise the VPN
network addresses it can reach to
the connected MCE.