Configuring Inter-As Option C - HP MSR2000 Configuration Manual

Step
11. Enter BGP VPNv4 address
family view.
12. Enable
VPNv4 routes with the PE in the
same AS and the ASBR in
different ASs.
13. Disable route target based
filtering of VPNv4 routes.

Configuring inter-AS option C

To configure inter-AS option C, perform configurations on PEs and ASBRs.
PE configuration:
•
Configure basic MPLS L3VPN, and specify the PE in another AS as an MP-EBGP peer. The route
targets for the VPN instances on the PEs in different ASs must match for the same VPN. For
information about PE configuration, see
Execute the peer ebgp-max-hop command to enable the local router to establish an EBGP
session to an indirectly-connected peer, because the PEs are not directly connected.
Specify the ASBR in the same AS as an IBGP peer, and enable BGP to exchange labeled IPv4
unicast routes with the ASBR.
ASBR configuration:
•
Configure a routing protocol, and enable MPLS and LDP on the interface connecting to an
internal router of the AS.
Specify the PE in the same AS as an IBGP peer, and the ASBR in a different AS as an EBGP
peer.
Enable BGP to exchange labeled IPv4 unicast routes with the PE in the same AS and the ASBR
in different AS.
Enable MPLS capability. There is no need to configure a label distribution protocol, for example,
MPLS LDP.
Configure a routing policy to determine which IPv4 unicast routes are advertised to the IBGP or
EBGP peer with MPLS labels.
In addition, configure BGP to advertise routes destined for a PE on PEs or ASBRs. For more information,
see Layer 3—IP Routing Configuration Guide.
Configuring a PE
To configure a PE for inter-AS option C:
Step
1. Enter system view.
2. Enter BGP view.
Command
address-family vpnv4
BGP to exchange
peer { group-name | ip-address }
enable
undo policy vpn-target
Command
system-view
bgp as-number
"Configuring basic MPLS
200
Remarks
N/A
By default, BGP cannot exchange
VPNv4 routing information with a
peer.
By default, the PE filters received
VPNv4 routes by route targets.
The routes surviving the filtering
are added to the routing table, and
the others are discarded.
L3VPN."
Remarks
N/A
N/A