193
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.
13.
Disable route target based
filtering of VPNv4 routes.
undo policy vpn-target
By default, the PE filters received
VPNv4 routes by route targets.
The routes surviving the filtering
are added to the routing table, and
the others are discarded.
Configuring inter-AS option C
To configure inter-AS option C, configure 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.
{
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.
