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Enabling Wide Metrics for Traffic Engineering

Normally, IS-IS metrics can have values up to 63, and IS-IS generates two type length values (TLVs), one for an IS-IS adjacency and the second for an IP prefix. To allow IS-IS to support traffic engineering, a second pair of TLVs has been added to IS-IS, one for IP prefixes and the second for IS-IS adjacency and traffic engineering information. With these TLVs, IS-IS metrics can have values up to 2²⁴–1 (16,777,215).

By default, the JUNOS software supports the sending and receiving of wide metrics. The JUNOS software allows a maximum metric value of 63 and generates both pairs of TLVs. To configure IS-IS to generate only the new pair of TLVs and thus to allow the wider range of metric values, include the wide-metrics-only statement:




wide-metrics-only;

For a list of hierarchy levels at which you can configure this statement, see the statement summary section for this statement.

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