221
The route targets configured on the PEs must match those configured on the ASBRs in the same AS
to make sure VPN routes sent by the PEs (or ASBRs) can be received by the ASBRs (or PEs). Route
targets configured on the PEs in different ASs do not have such requirements.
For more information, see "
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 connected 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 on the interface connected to the ASBR in another AS. There is no
need to configure a label distribution protocol, for example, 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 Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter interface view of the
interface connected 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 connected 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
[
mask-length
] }
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.
11.
Enter BGP VPNv4 address
family view.
address-family vpnv4
N/A
Содержание HPE FlexNetwork MSR Router Series
Страница 10: ...viii Index 540 ...
