The IGP floods two metrics for every link when the MPLS traffic engineering (TE) is configured in a network. The two metrics are the IS-IS link metric and the TE link metric. To optimize the use and performance of the network, it is always better to identify specific tunnels to carry data traffic and voice traffic. This implementation allows you to specify tunnel path selection to the requirements of each type of traffic. For example, certain tunnels are to carry voice traffic (which requires low delay) and other tunnels are to carry data (where delay is acceptable).
The path calculation metric implementation allows you to specify the path calculation for a given tunnel based on either of the following requirements:
The decision of whether to use te-metric or igp-metric for CSPF computation by the LSPs is determined by CLI configurations at two levels:
Note
The CLI configuration at the LSP level always overrides the configuration at the global level. That is, the decision to use te-metric or igp-metric for CSPF path calculation if configured at the LSP level, always overrides the configuration at the global level.