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{ 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.
472BConfiguring 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 instance view.
bgp
as-number [
instance
instance-name ]
[
multi-session-thread
]
N/A
3. Configure the ASBR in the
same AS as an IBGP peer.
peer
{ group-name | ipv4-address
[ mask-length ] }
as-number
as-number
By default, no BGP peers exist.
4. Configure the PE of another
AS as an EBGP peer.
peer
{ group-name | ipv4-address
[ mask-length ] }
as-number
as-number
By default, no BGP peers exist.
5. Create the BGP IPv4 unicast
address family and enter its
view.
address-family ipv4
[
unicast
]
By default, the BGP IPv4 unicast
address family is not created.
6. Enable BGP to exchange
IPv4 unicast routes with the
ASBR in the same AS.
peer
{ group-name | ipv4-address
[ mask-length ] }
enable
By default, BGP does not
exchange IPv4 unicast routes with
any peer.
7. Enable BGP to exchange
labeled IPv4 routes with the
ASBR in the same AS.
peer
{ group-name | ipv4-address
[ mask-length ] }
label-route-capability
By default, BGP cannot exchange
labeled routes with any IPv4 peer
or peer group.
8. Return to BGP instance view.
quit
N/A
9. Enter BGP VPNv4 address
family view.
address-family vpnv4
N/A
10. Enable BGP to exchange
VPNv4 routes with the PE in
different ASs.
peer
{ group-name | ipv4-address
[ mask-length ] }
enable
By default, BGP cannot exchange
VPNv4 routes with any peer.
11. (Optional.) Configure the PE
to not change the next hop of
routes advertised to the peer.
peer
{ group-name | ipv4-address
[ mask-length ] }
next-hop-invariable
Configure this command on the
RR so the RR does not change
the next hop of advertised VPNv4
routes.
473BConfiguring an ASBR
To set up an inter-AS public tunnel for the inter-AS option C solution, an ASBR must assign an MPLS
label to the route destined for a PE, and advertise the label along with the route. Typically, the routes
advertised by an ASBR through BGP include the PE address as well as other routes. You can
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