Which of the following routing protocols are supported on the Alcatel-Lucent 7750 SR to enable constraint-based LSPs? (Choose two)

To establish constraint-based Label Switched Paths (LSPs), a path computation element, such as the Constrained Shortest Path First (CSPF) algorithm, requires a Traffic Engineering Database (TED). This database is built and maintained by Interior Gateway Protocols (IGPs) that have been extended to support traffic engineering. On the Nokia 7750 SR, both OSPF with TE extensions (OSPF-TE) and IS-IS with TE extensions (ISIS-TE) are supported IGPs for flooding TE link-state information, such as link bandwidth and administrative groups, which populate the TED.

A. RIPv2-TE: RIP is a distance-vector protocol and does not have the necessary extensions to flood link-state or traffic engineering attributes.
B. CSPF: CSPF is the algorithm that calculates the path using the TED; it is not a routing protocol that populates the database.
E. RSVP-TE: RSVP-TE is a signaling protocol used to request and establish the LSP along the path calculated by CSPF; it does not build the TED.

1. Nokia 7750 SR OS MPLS Guide, Release 21.10.R1, "MPLS and LDP", Section: "Traffic Engineering in OSPF" and "Traffic Engineering in IS-IS". The document states, "Both IS-IS and OSPF are IP routing protocols that have been extended to support traffic engineering."

2. Nokia 7750 SR OS OSPF and IS-IS Guide, Release 21.10.R1, "OSPF", Section: "Traffic Engineering Extensions to OSPF". This section details the use of Opaque LSAs (Type 10) for advertising TE parameters.

3. Nokia 7750 SR OS OSPF and IS-IS Guide, Release 21.10.R1, "IS-IS", Section: "IS-IS Traffic Engineering Extensions". This section details the use of new TLVs to carry TE information.