HP FlexNetwork 10500 Series Configuration Manual page 100

Configuring tunnel reoptimization
Tunnel reoptimization allows you to manually or dynamically trigger the ingress node to recalculate a
path. If the ingress node recalculates a better path, it creates a new CRLSP, switches the traffic from
the old CRLSP to the new CRLSP, and then deletes the old CRLSP.
Perform this task on the ingress node of an MPLS TE tunnel.
To configure tunnel reoptimization:
Step
1. Enter system view.
2. Enter MPLS TE tunnel
interface view.
3. Enable tunnel reoptimization.
4. Return to user view.
5. (Optional.) Immediately
reoptimize all MPLS TE
tunnels that are enabled with
the tunnel reoptimization
feature.
Setting TE flooding thresholds and interval
When the bandwidth of an MPLS TE link changes, IGP floods the new bandwidth information, so the
ingress node can use CSPF to recalculate the path.
To prevent such recalculations from consuming too many resources, you can configure IGP to flood
only significant bandwidth changes by setting the following flooding thresholds:
•
Up threshold—When the percentage of the reservable-bandwidth increase to the maximum
reservable bandwidth reaches the threshold, IGP floods the TE information.
•
Down threshold—When the percentage of the reservable-bandwidth decrease to the
maximum reservable bandwidth reaches the threshold, IGP floods the TE information.
You can also set the flooding interval at which bandwidth changes that cannot trigger immediate
flooding are flooded.
This task can be performed on all nodes that the MPLS TE tunnel traverses.
To set TE flooding thresholds and the flooding interval:
Step
1. Enter system view.
2. Enter interface view.
3. Set the up/down threshold.
4. Return to system view.
5. Enter MPLS TE view.
6. Set the flooding interval.
Command
system-view
interface tunnel tunnel-number
[ mode mpls-te ]
mpls te reoptimization [ frequency
seconds ]
return
mpls te reoptimization
Command
system-view
interface interface-type
interface-number
mpls te bandwidth change
thresholds { down | up } percent
quit
mpls te
link-management
periodic-flooding timer interval
91
Remarks
N/A
N/A
By default, tunnel
reoptimization is disabled.
N/A
N/A
Remarks
N/A
N/A
By default, the up/down threshold
is 10% of the link reservable
bandwidth.
N/A
N/A
By default, the flooding interval is
180 seconds.