222
Step Command
Remarks
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, 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 "
{
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:
{
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 IBGP peer, and the ASBR in a different AS as an
EBGP peer.
{
Enable BGP to exchange labeled IPv4 unicast routes with the PE in the same AS and the
ASBR in different AS.
{
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.
{
(Optional.) Configure a routing policy to determine which IPv4 unicast routes are advertised
to the IBGP or EBGP peer with MPLS labels.
In addition, configure BGP to advertise routes destined for a PE on PEs or ASBRs. For more
information, see
Layer 3—IP Routing Configuration Guide
.
Configuring a PE
To configure a PE for inter-AS option C:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter BGP view.
bgp
as-number
N/A
3.
Configure the ASBR in the
same AS as an IBGP peer.
peer
{
group-name
|
ip-address
[
mask-length
] }
as-number
as-number
By default, no BGP peer is
created.
4.
Configure the PE of another
AS as an EBGP peer.
peer
{
group-name
|
ip-address
[
mask-length
] }
as-number
as-number
By default, no BGP peer is
created.
5.
Create the BGP IPv4 unicast
address-family ipv4
[
unicast
]
By default, the BGP IPv4 unicast
Summary of Contents for HPE FlexNetwork MSR Router Series
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