Configuration Prerequisites; Configuration Procedure - H3C SR8800 10G Mpls Configuration Manual

Configuration prerequisites

The configurations described in this section are used in conjunction with CSPF and the dynamic signaling
protocol CR-LDP or RSVP-TE.

Configuration procedure

Configuring the failed link timer
A CSPF failed link timer starts once a link goes down. If IGP removes or modifies the link before the timer
expires, CSPF will update information about the link in TEDB and stops the timer. If IGP does not remove
or modify the link before the timer expires, the state of the link in TEDB will change to up.
To configure failed link timer:
Step
1. Enter system view.
2. Enter MPLS view.
3. Configure the CSPF failed link
timer.
Configuring flooding thresholds
After the bandwidth of links regulated by MPLS TE changes, CSPF may need to recalculate paths. This
tends to be resource consuming as recalculation involves IGP flooding. To reduce recalculations and
flood only significant changes, you may configure the following two IGP flooding thresholds in
percentages:
Up threshold. When the percentage of available-bandwidth increase to the maximum reservable
•
bandwidth exceeds the threshold, the change is flooded.
• Down threshold. When the percentage of available-bandwidth decrease to the maximum
reservable bandwidth exceeds the threshold, the change is flooded.
To configure flooding thresholds:
Step
1. Enter system view.
2. Enter MPLS TE tunnel interface
view.
3. Configure the up/down
thresholds for IGP to flood
bandwidth changes.
Specifying the link metric type for tunnel path calculation
To specify the metric type for tunnel path calculation:
Step
1. Enter system view.
2. Enter MPLS view.
Command
system-view
mpls
mpls te cspf timer failed-link
timer-interval
Command
system-view
interface interface-type
interface-number
mpls te bandwidth change
thresholds { down | up } percent
Command
system-view
mpls
76
Remarks
N/A
N/A
Optional.
The default is 10 seconds.
Remarks
N/A
N/A
Optional.
Both up and down flooding
thresholds are 10 by default.
Remarks
N/A
N/A