Configuring Inter-As Option B - HPE FlexNetwork 5510 HI Series Mpls Configuration Manual

Configuring inter-AS option B

To configure inter-AS option B, configure 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 more 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 on the interface connected to the remote ASBRs. 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.
To configure inter-AS option B on an ASBR:
Step
1. Enter system view.
2. Enter interface view of the
interface connected to an
internal router of the AS.
3. Enable
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
interface.
8. Return to system view.
9. Enter BGP view.
10. Create a BGP peer.
11. Enter BGP VPNv4 address
family view.
12. Enable BGP to exchange
VPNv4 routes with the PE in
the same AS and the ASBR
in different ASs.
Command
system-view
interface
interface-number
MPLS on the
mpls enable
mpls ldp enable
quit
interface
interface-number
MPLS on the
mpls enable
quit
bgp as-number
peer { group-name | ip-address
[ mask-length ] } as-number
as-number
address-family vpnv4
peer { group-name | ip-address
[ mask-length ] } enable
"Configuring basic MPLS
interface-type
interface-type
184
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.
N/A
By default, BGP cannot exchange
VPNv4 routing information with a
peer.