Vyatta Network OS Documentation

Learn how to install, configure and operate the Vyatta NOS, which helps drive our virtual networking & physical platforms portfolio.

Traffic Engineering Database

An LSR Traffic Engineering Database (TED) stores topology information about the MPLS domain.

The TED for an LSR contains topology information about the nodes in an MPLS domain and the links that connect them.

This topology information is obtained from the OSPF traffic engineering (OSPF-TE) LSAs with traffic engineering extensions. OSPF-TE LSAs with TE extensions have special extensions that contain information about an MPLS enabled interface’s traffic engineering metric, bandwidth reservations, and administrative group memberships.

An LSR, when configured to do so, floods OSPF-TE LSAs with TE extensions for its MPLS-enabled interfaces to its neighboring routers in the OSPF area. Other LSRs store the information from the OSPF-TE LSAs with TE extensions in their own Traffic Engineering Databases (TEDs), allowing each LSR in the area to maintain an identical TED describing the MPLS topology. The topology information in the TED is used by the CSPF process when it calculates traffic-engineered paths for signaled LSPs. You can display the contents of the TED for an LSR.

LSP attributes and requirements used for traffic engineering

In addition to the topology information in the TED, CSPF considers attributes and requirements specified in configuration statements for the LSP. The following user-specified parameters are considered when CSPF calculates a traffic-engineered path for a signaled LSP:

∙ Destination address of the egress LER

∙ Explicit path to be used by the LSP

∙ Bandwidth required by the LSP

∙ Setup priority for the LSP

∙ Metric for the LSP

∙ Whether the LSP includes or excludes links belonging to specified administrative groups