210
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 instance view.
bgp
as-number
[
instance
instance-name
]
[
multi-session-thread
]
N/A
10.
Create a BGP peer.
peer
{
group-name
|
ipv4-address
[
mask-length
] }
as-number
as-number
By default, no BGP peers exist.
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
|
ipv4-address
[
mask-length
] }
enable
By default, BGP cannot exchange
VPNv4 routing information with a
peer.
13.
Disable route target filtering
of VPNv4 routes.
undo policy vpn-target
By default, route target filtering is
enabled for received VPNv4
routes. Only VPNv4 routes whose
export route target attribute
matches local import route target
attribute are added to the routing
table.
241B
Configuring inter-AS option C
To configure inter-AS option C, perform configurations on PEs and ASBRs.
•
PE configuration:
{
Configure basic MPLS L3VPN, and specify the PE in another AS as an MP-EBGP 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 "
805H
Configuring basic MPLS L3VPN
."
{
Execute the
peer ebgp-max-hop
command to enable the local router to establish an EBGP
session to an indirectly-connected peer, because the PEs are not directly connected.
{
Specify the ASBR in the same AS as an IBGP peer, and enable BGP to exchange labeled
IPv4 unicast routes with the ASBR.
•
ASBR configuration:
