R0106-HP MSR Router Series MPLS Configuration Guide(V7)

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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 "Configuring basic MPLS L3VPN."
• AS
BR 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:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface view of the
interface connecting to an
internal router of the AS.
interface interface-type
interface-number
N/A
3. Enable MPLS on the interface.
mpls enable
By default, MPLS is disabled on the
interface.
4. Enable MPLS LDP on the
interface.
mpls ldp enable
By default, MPLS LDP is disabled
on the interface.
5. Return to system view.
quit N/A
6. Enter interface view of the
interface connecting to the
remote ASBR.
interface interface-type
interface-number
N/A
7. Enable MPLS on the interface.
mpls enable
By default, MPLS is disabled on the
interface.
8. Return to system view.
quit N/A
9. Enter BGP view.
bgp as-number N/A
10. Create a BGP peer.
peer { group-name | ip-address }
as-number as-number
By default, no BGP peer is
configured.
Configure PEs in the same AS as
IBGP peers, and ASBRs in different
ASs as EBGP peers.