Configuring Inter-As Option B - HP MSR2000 Configuration Manual

Configuring inter-AS option B

To configure inter-AS option B, perform configurations on PEs and ASBRs.
PE configuration:
•
Configure basic MPLS L3VPN, and specify the ASBR in the same AS as an MP-IBGP 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
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 MP-IBGP peer, and the ASBR in a different AS as an
MP-EBGP peer.
Disable VPN target filtering for VPNv4 routes so the ASBR can maintain all VPNv4 routes and
advertise the routes to the peer ASBR.
Enable MPLS capability. There is no need to configure a label distribution protocol, for example,
MPLS LDP.
An ASBR always sets itself as the next hop of VPNv4 routes advertised to an MP-IBGP peer regardless of
the peer next-hop-local command.
ASBR-PEs use MP-BGP to assign labels and create BGP LSPs. There is no need to configure MPLS LDP
between ASBR-PEs.
To configure inter-AS option B on an ASBR:
Step
1. Enter system view.
2. Enter interface view of the
interface connecting to an
internal router of the AS.
3. Enable MPLS on the interface.
4. Enable MPLS LDP on the
interface.
5. Return to system view.
6. Enter interface view of the
interface connecting to the
remote ASBR.
7. Enable MPLS on the interface.
8. Return to system view.
9. Enter BGP view.
10. Create a BGP peer.
"Configuring basic MPLS
Command
system-view
interface interface-type
interface-number
mpls enable
mpls ldp enable
quit
interface interface-type
interface-number
mpls enable
quit
bgp as-number
peer { group-name | ip-address }
as-number as-number
199
L3VPN."
Remarks
N/A
N/A
By default, MPLS is disabled on the
interface.
By default, MPLS LDP is disabled
on the interface.
N/A
N/A
By default, MPLS is disabled on the
interface.
N/A
N/A
By default, no BGP peer is
configured.
Configure PEs in the same AS as
IBGP peers, and ASBRs in different
ASs as EBGP peers.