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Configuring 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 configure a routing
policy to filter routes. Routes surviving the filtering are assigned labels, and all others are advertised as
common IPv4 routes.
To configure a routing policy, use the following commands:
•
if-match mpls-label
—Matches routes carrying MPLS labels.
•
apply mpls-label
—Sets MPLS labels for IPv4 routes to be advertised to a peer. You can use this
command together with
if-match
clauses. For example, when used together with the
if-match
mpls-label
command, the
apply mpls-label
sets new MPLS labels for routes with MPLS labels. The
newly assigned labels are advertised along with the routes.
For more information about routing policy configuration, see
Layer 3—IP Routing Configuration Guide
.
To configure an ASBR-PE for inter-AS option C:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
(Optional.) Create a routing
policy, and enter routing
policy view.
route-policy
route-policy-name
{
deny
|
permit
}
node
node-number
By default, no routing policy is
created.
3.
(Optional.) Match IPv4 routes
carrying labels.
if-match mpls-label
By default, no MPLS label match
criterion is configured.
4.
(Optional.) Set labels for IPv4
routes.
apply mpls-label
By default, no MPLS label is set for
IPv4 routes.
5.
Return to system view.
quit
N/A
6.
Enter interface view of the
interface connected to an
internal router of the AS.
interface
interface-type
interface-number
N/A
7.
Enable MPLS on the interface.
mpls enable
By default, MPLS is disabled on the
interface.
8.
Enable MPLS LDP on the
interface.
mpls ldp enable
By default, MPLS LDP is disabled
on the interface.
9.
Return to system view.
quit
N/A
10.
Enter interface view of the
interface connected to the
remote ASBR.
interface
interface-type
interface-number
N/A
11.
Enable MPLS on the interface.
mpls enable
By default, MPLS is disabled on the
interface.
12.
Return to system view.
quit
N/A
13.
Enter BGP view.
bgp
as-number
N/A
14.
Configure the PE 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.
