HP MSR2000 series Configuration Manual page 415

Step
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.
Configuring IBGP between MCE and VPN site
If IBGP is used for exchanging routing information between an MCE and VPN sites, you must configure
a BGP peer for each VPN instance respectively, and redistribute the IGP routes of each VPN instance on
the VPN sites.
Configure the MCE:
1.
Step
1. Enter system view.
2. Enter BGP view.
3. Enter BGP-VPN instance view.
4. Configure an IBGP peer.
5. Configure the system to be the
RR and specify the peer as the
client of the RR.
Command
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 ] *
Command
system-view
bgp as-number
ipv4-family vpn-instance
vpn-instance-name
peer { group-name | ip-address }
as-number as-number
peer { group-name | ip-address }
reflect-client
402
Remarks
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.
Remarks
N/A
N/A
N/A
N/A
Optional.
By default, no RR or RR client is
configured.