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To configure an ASBR PE for inter-AS option C:
To do…
Use the command…
Remarks
Enter system view
system-view
—
Enter BGP view
bgp
as-number
—
Configure each PE in the same AS
as the iBGP peer
peer
{
group-name
|
ip-address
}
as-number
as-number
Required
Enable the ASBR PE to exchange
labeled IPv4 routes with the PEs in
the same AS
peer
{
group-name
|
ip-address
}
label-route-capability
Required
By default, the switch does not
advertise labeled routes to the IPv4
peer or peer group.
Configure the ASBR PE to change
the next hop to itself when
advertising routes to PEs in the
same AS
peer
{
group-name
|
ip-address
}
next-hop-local
Required
By default, a BGP speaker does not
use its address as the next hop
when advertising a route to its
iBGP peer or peer group.
Configure the remote ASBR PE as
the eBGP peer
peer
{
group-name
|
ip-address
}
as-number
as-number
Required
Enable the ASBR PE to exchange
labeled IPv4 routes with the peer
ASBR PE
peer
{
group-name
|
ip-address
}
label-route-capability
Required
By default, the switch does not
advertise labeled routes to the IPv4
peer.
Apply a routing policy to the routes
advertised by peer ASBR PE
peer
{
group-name
|
ip-address
}
route-policy
route-policy-name
export
Required
By default, no routing policy is
applied to a peer or peer group.
Configuring the routing policy
After you configure and apply a routing policy on an ASBR PE, it does the following:
•
Assigns MPLS labels to the routes received from the PEs in the same AS before advertising them to
the peer ASBR PE.
•
Assigns new MPLS labels to the labeled IPv4 routes to be advertised to the PEs in the same AS.
Which IPv4 routes are to be assigned with MPLS labels depends on the routing policy. Only routes that
satisfy the criteria are assigned with labels. All the other routes are still common IPv4 routes.
To configure a routing policy for inter-AS option C on an ASBR PE:
To do…
Use the command…
Remarks
Enter system view
system-view
—
Enter routing policy view
route-policy
policy-name
permit
node
seq-number
Required
Configure the switch to match IPv4
routes with labels
if-match mpls-label
Required
Configure the switch to assign
labels to IPv4 routes
apply mpls-label
Required
By default, an IPv4 route does not
carry any label.
