metric-bias

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Configures the bias of the traffic engineering metric based on the percentage of reservable bandwidth in use.

Syntax: [no] metric-bias simple-linear low-percent high-percent max-bias

low-percent	Specifies the minimum bandwidth usage that metric bias is applied. Bias is not calculated when the bandwidth in use is below this value.
high-percent	Specifies the maximum bandwidth usage that metric bias is applied. Bias is not calculated when the bandwidth in use is greater than this value.
max-bias	The maximum value that can be added to the current metric.

Description: Each link in the MPLS traffic engineering data base has an associated administrative cost, or metric. This includes links that are learned from other LSRs.

The metric-bias command increases the metric used for a given link in an SPF computation. The increase is based on the percentage of bandwidth in use on the link. The metric is increased more if the link is currently heavily used

When metric bias is specified, the metric of a link using a low percentage of available bandwidth is increased very little or not at all. The metric of a link using a high percentage of available bandwidth is increased more significantly.

The metric bias is calculated as follows:

bandwidth % - low-percent
------------------------------------- * max-bias
high-percent - low-percent

Fractional increases are truncated to the nearest integer.

Use the metric-bias command to increase the metric used for the SPF calculation to determine the path the tunnel takes.

Use the no metric-bias command to remove the specification for metric-bias.

Factory Default: 0.

Command Mode: Traffic engineering parameter-set, traffic engineering tunnel-default, and traffic engineering tunnel-name.

Example 1: In the following example:

• The metric bias command configures the metric to increase when the bandwidth in use exceeds 30% of the maximum reservable bandwidth.
  
  
• The metric will continue to be increased until the bandwidth reaches 90% of the maximum reservable bandwidth.
  
  

  The maximum value that can be added to the metric is configured as 8.
  
  

• Enter configuration commands, one per line. End with CNTL/Z.
  
  

router(config)#mpls te ospf router(config-te)#tunnel ToPVE router(config-te-tunnel)#metric-bias simple-linear 30% 90% 8

In this example, if the bandwidth in use rises to 60%, the metric is increased by a value of 3:

60 - 30
---------- * 8 = (truncates to 2)
60

Example 1: In the following example, the no metric bias command removes the metric-bias specification:

Enter configuration commands, one per line. End with CNTL/Z. router(config)#mpls te ospf router(config-te)#tunnel ToPVE router(config-te-tunnel)#no metric-bias

Related Commands: metric
default-max-reservable-bandwidth
mpls te max-reservable-bandwidth

Copyright © 2004 Avici Systems Inc.
Avici® and TSR® is a registered trademark of Avici Systems Inc.
IPriori™, Composite Links™, SSR™, QSR, and NSR® are trademarks of Avici Systems Inc.

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    Last Updated: 12/19/04 at 14:56:07

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