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NOTE:
•
The
interface-type argument in the
ip
route-static
command must be tunnel. In addition, the preference
value must be set.
•
For more information about static routing, see
Layer 3—IP Routing Configuration Guide.
Forwarding traffic along MPLS TE tunnels through automatic route advertisement
Two approaches, IGP shortcut and forwarding adjacency, are available to automatic route
advertisement to advertise MPLS TE tunnel interface routes to IGPs, allowing traffic to be routed down
MPLS TE tunnels.
In either approach, TE tunnels are considered point-to-point links and TE tunnel interfaces can be set as
outgoing interfaces.
IGP shortcut and forwarding adjacency are different in that in the forwarding adjacency approach,
routes with TE tunnel interfaces as outgoing interfaces are advertised to neighboring devices but not in
the IGP shortcut approach. Therefore, TE tunnels are visible to other devices in the forwarding adjacency
approach but not in the IGP shortcut approach.
You may assign a metric, either absolute or relative, to TE tunnels for the purpose of path calculation in
either approach. If it is absolute, the metric is directly used for path calculation. If it is relative, the cost of
the corresponding IGP path must be added to the metric before it can be used for path calculation.
Enable OSPF or IS-IS on the tunnel interface of the MPLS TE tunnel before configuring automatic route
advertisement.
1.
Configure IGP shortcut
To configure IGP shortcut:
To do…
Use the command...
Remarks
Enter system view
system-view
––
Enter MPLS TE tunnel interface view
interface tunnel
tunnel-number
––
Configure the IGP to take the MPLS
TE tunnels in up state into account
when performing enhanced SPF
calculation
mpls te igp shortcut
[
isis
|
ospf
]
Required
MPLS TE tunnels are not considered
in the enhanced SPF calculation of
IGP.
If no IGP type is specified, the
configuration applies to both OSPF
and ISIS by default.
Assign a metric to the MPLS TE
tunnel
mpls te igp metric
{
absolute
|
relative
}
value
Optional
The metrics of TE tunnels equal the
metrics of their corresponding IGP
routes by default.
Submit current tunnel configuration
mpls te commit
Required
Exit to system view
quit
––
Enter OSPF view
ospf
[
process-id
]
––
Enable the IGP shortcut function
enable traffic-adjustment
Required
Disabled by default
2.
Configure forwarding adjacency
