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OSPF and IS-IS: Choosing an IGP for Large-Scale Networks by Jeff Doyle

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11.3. OSPF Extensions for Traffic Engineering

The role of OSPF and IS-IS in MPLS TE is to communicate TE interface parameters throughout an area to populate the traffic engineering database. In this, the role of these protocols is the same as their role for IGPs; in fact, this is just an extension of basic link state IGP behavior. The OSPF extensions for TE are specified in RFC 3630.[4]

[4] Dave Katz, Kireeti Kompella, and Derek M. Yeung, “Traffic Engineering (TE) Extensions to OSPF Version 2,” RFC 3630, September 2003.

OSPF carries TE interface parameters in Traffic Engineering LSAs (Figure 11.9), an adaptation of type 10 Opaque LSAs. As first discussed in Section 10.1.2, Opaque LSAs are general-use LSAs intended for future extensions; the extension-specific ...

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