184
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
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 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
[
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
12.
Enable BGP to exchange
VPNv4 routes with the PE in
the same AS and the ASBR
in different ASs.
peer
{
group-name
|
ip-address
[
mask-length
] }
enable
By default, BGP cannot exchange
VPNv4 routing information with a
peer.
Содержание FlexNetwork 5510 HI Series
Страница 9: ...vii Remote support 460 Documentation feedback 460 Index 462 ...
Страница 318: ...309 Request list 0 Retransmit list 0 ...
Страница 363: ...354 Verify that CE 1 and CE 2 can ping each other Details not shown ...
Страница 446: ...437 The MCE has redistributed the OSPF routes of the two VPN instances into the EBGP routing tables of PE 1 ...